Glossary of Woodworking terms
backsteady --- When turning
long thin items, such as a spindle,
on a lathe,
there can be a tendency for the wood to flex. This can cause serious chatter which can make
it impossible to obtain a smooth turning. Worse still, it can actually
be dangerous since it is possible for such flexing to hit a resonant
frequency and cause the wood to flip off of the lathe. A backsteady is
any device that supports the wood so that it does not flex. Generally,
it is some kind of roller system that supports the wood but that has
wheels or rollers that move with the wood so that it doesn't cause
wear. Also just called a "steady" and "steady rest". I assume from the
name that there might have been versions at one time that just steadied
a spindle from the back, but these days all the versions I see surround
the spindle and support it with (generally) 3 rollers. There is a
similar tool used for supporting the back of face turnings called
a bowl steady.
Example:
banjo --- The part on a lathe which slides along
the bed and
supports the tool rest.
Illustrated with wood lathe.
bead --- (1) In lathe turning, a
bead is a rounded projection, usually turned on a spindle although they
are sometimes done on face
turnings. There are specialty tools used for making
them; see, for example, beading
tool, beading
and parting tool, and bedan.
If the bead stands fully exposed above the surrounding wood, it is
called a "standing bead" but if the surrounding wood is more or less flush with the top
of the bead, then the bead is called an "inset bead". Often, it's not
particularly meaningful to try to categorize a bead as inset or
standing, but some cases are clearcut.
bead --- (2) A semi-circular piece of molding.
bead --- (3) A small rounded, raised profile, routed
along the edge of a board, particularly the edges of boards that are
placed vertically to form a wall paneling.
Examples of type (1):
beading and parting tool
--- A lathe tool
that looks exactly like a squat parting
tool and in fact is used as a wide parting tool in
addition to being used to form beads. When the tool is used as a
parting tool, the cutting edge is kept parallel to the axis of rotation
of the spindle
and the tool acts like a scraper
just like a regular parting tool. When the tool is used as a beading
tool, the cutting edge is rotated through a sweep and is not parallel
to the axis of the spindle and the edge slices the wood rather than scraping it. Examples:
beading scraper --- synonymous with beading tool
beading tool --- A lathe tool; a small chisel used to form beads
on a spindle.
There really are two totally different types of beading tools. The
first has a curved cutting edge and LOOKS like what one would use to
form a bead, and the second has a square cross section and a flat
cutting edge and looks like a squat parting
tool. This second form comes in two flavors,
depending on the way the end is shaped. When the end is cut as a wedge, so
that the tool looks exactly like a squat parting tool, it is called a beading and parting tool.
When the end is just sliced across, it is called a bedan. Both of those terms
show their own illustrations, and what is shown below is the first
form, the one with the curved cutting edge, which is used to scrape the
spindle to create a bead. Examples:
bed --- As regards woodworking, this
generally means some flat surface that is the base of an operation. For
example, the flat part of a table
saw or radial
arm saw where the wood rides is called the bed. In
a pickup truck, the flat surface in the back where you throw things is
the bed. On a lathe,
the bed is the pair of horizontal rails that join the headstock and the tailstock and over
which the turned part is positioned. A wood lathe bed is illustrated
with wood lathe.
On a lathe bed, the rails are called the ways.
bedan --- A chisel-shaped lathe tool used for spindle turning
in a similar way to a skew
chisel, but very specifically for turning beads.
The tool looks a lot like a beading and parting tool
except that the cutting edge is on the top of the shank and there is
a single face below the edge instead of two faces meeting in the middle
as there is on the beading and parting tool. This tool is sometimes
used as a parting tool for wide parts, but its primary use is as a skew
for forming beads.
Examples:
bed gap --- On a wood lathe there is
often an extra deep area of the bed
right next to the faceplate
so that face turnings
can be done with a larger swing
than is available for spindleturning.
blank --- A piece of wood that has
been brought into very roughly the shape and size of the product that
it is intended to become. Most often refers to pieces that will
subsequently be lathe
turned or carved.
Typically this will be a cylinder for a bowl turning, and a relatively
slender, square cross
sectioned piece for turning between centers. For
example a "pen blank" is a small piece of wood about 3/4" x 3/4" x 5"
or 6" long and the pen-maker puts it on a lathe
and turns off everything that doesn't look like a pen. See bowl blank for pics.
For carving, a blank might be a shape cut out roughly on a band saw for
subsequent fine carving to final shape. Examples:
bowl --- In wood turning, this
refers to a form in which, generally, the height is less than the
diameter (but it could be a little more) and the rim is the largest
diameter. If the rim curves back in towards the center, the object is
more likely to be called an open
form and if it curves back to a very small opening,
the object is a hollow form.
The range of shapes that are called bowls is QUITE large and the
difference between "bowl" and vase
is sometimes debatable. Compare/contrast to other lathe turnings.
Examples:
bowlblank --- A piece of wood
that is destined to be turned into a bowl on a lathe and that has been
put into roughly the size and shape of the final bowl prior to turning.
Examples:
bowl coring system ---
A cutting tool and tool rest that make up a system for coring out bowls
in a way that allows for multiple, successively smaller, bowls to all
be turned from the same bowl
blank. The coring knife is a curved parting tool that
cuts a bowl shape out of the front of a bigger bowl shape, and the
process can be repeated multiple times depending on the size of the
blank. Examples:
bowl gouge --- A type of lathe gouge
specifically designed for face
turning. Bowl gouges tend to be longer and heavier
than spindle gouges
and they also have a deeper flute.
They are specifically designed to remove large amounts of wood from the
curved sides of a turning bowl. The end bevel grind varies quite a bit on
these gouges and there is a particular type of grind called a fingernail grind
that makes the bowl gouge even more aggressive in removing material,
and in fact many turners (myself included) much prefer the fingernail
grind to a regular grind. However, the term "fingernail gouge" does not
normally refer to a bowl gouge with a fingernail grind, but rather to a
spindle gouge with a fingernail grind. The grind on bowl gouges will vary
somewhat by manufacturer, even aside from the major differences between
regular grind and fingernail grind. Also, there is more variety in the
shape of the cannel
on a bowl gouge than on a spindle gouge (where they tend to be circular
arcs).
Below are two sets of composite pics, the first with regular grind bowl
gouges and the second with fingernail grind bowl gouges:
BOWL GOUGES WITH REGULAR GRIND
BOWL GOUGES WITH FINGERNAIL GRIND
bowl lathe --- A short bed,
large swing
wood lathe,
often without a tailstock,
that is used just for turning bowls.
bowl scraper --- A lathe tool; a variant
on the round nose
scraper in which the cutting edge is mostly on one
side and continues along the body of the scraper (on that side) for an
amount that varies by manufacturer, but which is more than what exists
on a round nose scraper. The purpose is to provide a large cutting
surface placed so that it is most useful when turning the insides of
bowls. The "normal" bowl scraper is what is also known as an inboard bowl scraper,
for reasons that are discussed with the term inboard turning.
When turning the outsides of bowls, using outboard turning
it is useful to have a tool where the cutting edge is on the opposite
side, and that tool is the outboard
bowl scraper. It should be noted, however, that
many turners turn the outside of their bowls first, with the outside of
the bowl pointing away from the headstock
and then they remount and turn the inside; when using this technique,
there is no need for an outboard scraper. Outboard bowl scrapers are
not as widely available as regular bowl scrapers. Examples:
bowl steady --- A support
device much like a backsteady
but made to work with bowls to support them from the rear. Example:
box --- In addition to having the
normal English language meaning (e.g. jewelry box, cigar box), in wood
turning this term is also used for round containers, turned on a lathe, that a
non-woodworker would not normally think of as a "box" since the very
terms "box" and "boxy" imply a rectangularity that is not present in
what I designate, in this glossary, by a term that I like even though I
have only rarely seen it used, and that is lathe box.
cannel --- The hollowed out part
of a gouge
blade. The ground, sharpened end of the cannel is the cutting edge of
the gouge. If the ground out portion is on the inside of the blade it
is called in-cannel
and if it is on the outside of the blade, it is called out-cannel. As a
nominal rule, In-cannel blades are used for concave surfaces
and in-cannel blades are used for convex
surfaces but good wood turners make their own rules after experimenting
with what works best for them.
captive hollowing tool
--- An elaborate, articulate-arm, mechanism for doing precision lathe turning of
deep hollow forms. Most (possibly all these days) come with an
attachment that puts a laser beam on the outside of the turning form so
that the wall thickness can be judged with great accuracy, thus
allowing very uniform wall turning with no danger of making it too
thin. These are expensive systems, but for those who do this kind of
turning, I can see how they would be invaluable. Examples:
captive ring tool --- A lathe tool; A special
scraper
that is used to cut full, self-contained rings on spindles such that they
are captive around the spindle and look like they had to have been put
there by magic. The "captive ring tool" is not at all the same beast as
the ring tool.
Captive ring tools come in two forms, the first being a solid ground
scraper and the second being a variation of the multi tip scraper.
Examples:
catch --- In lathe turning, when
the lathe tool
digs into the wood and holds it instead of scraping or slicing it,
and the lathe consequently hesitates or stops turning completely.
Catches are the bane of novice turners and overly aggressive pros.
Catches can cause nasty gouges
in the workpiece and if the lathe
tool is positioned with too much of it hanging out
over the tool rest,
a strong catch can break or bend the tool or grab it out of the
operator's hand, any of which events would be considered a Bad Thing
and likely to cause loud exclamations of words that we do not encourage
our children to use.
Celtic grind --- synonymous with fingernail grind
centerline --- (1) On any
tool that has rotational action, the centerline is the axis of rotation.
centers --- (1) On a lathe, the parts at each
end of a spindle
and that are pressed against it to hold it in place, thus the
expression "turning between centers". See also cone center, dead center, drive center, live center and ring center. Centers,
especially those that mount in a tailstock
will usually be part of a morse taper or other machiine taper.
centers --- (2) The inner plies of a plywood panel.
Some definitions specifically state that such use of the term implies
that the grain of the centers runs parallel to the grain of the front
and back plies but that definition restricts the term to only the one
innermost ply and I have seen it used to mean all but the outer plies
(that is, synonymous with core).
chatter --- (1)[noun] A rapid,
and usually noisy, vibration of a workpiece due to interaction with a
moving tool edge, or of the tool edge itself due to interaction with a
workpiece. Chatter tends to be bad because it represents an uneven
operation of a cutting tool, and it is not a happy sound for a
woodworker since it means things are not going smoothly.
chatter --- (2)[noun] Speech emanating from one's
spouse when one is trying to concentrate on a woodworking project. This
is not a happy sound for a woodworker, because unless one changes
concentration from the woodworking project to the chattering, things
will not go smoothly later.
chatter work --- On a wood lathe, there is a
technique for producing a decorative pattern by having a thin lathe tool that is
presented to the workpiece surface in such a way as to deliberately
cause the tool to chatter
harmonically to produce a wave-like pattern on the work surface. This
effect is sometimes produced UNintentionally and has to be smoothed
over. When this harmonic chatter is done deliberately, it is called
chatter work or "harmonic chatter"; when done UNintentionally, it is
generally just called "harmonic chatter".
chisel --- A metal tool, usually steel, with a
straight sharpened edge at one end and a handle on the other. It is
used to chip, carve, engrave, turn, or otherwise cut into a solid
material such as wood, stone, or metal. A chisel may be forced into the
workpiece by hand or by blows of acarving mallet
on the top of its handle or in the case of a lathe chisel, pushed into
turning wood while being supported by a tool
rest. Chisels come in an almost unlimited variety
of sizes and shapes, depending on intended use. Although there are
three fundamental types of chisels, there are numerous terms describing
chisels and their attributes, so I have listed below a large number of
such terms with links to their definitions.
chisels vs gouges ---
Although there is total sloppiness in the common usage of these terms,
there IS a clear and cleanly defined technical distinction between chisels and gouges and it is simply
that chisels always have cutting edges that are flat and gouges always
have curved cutting edges. Both carving gouges
and lathe gouges
tend to be called chisels in common usage and it is absolutely normal
to see a "chisel set" which contains gouges.
A chisel may have a "V" shaped pair of straight edges (typically at
either 60 degrees or 90 degrees to each other), but if something has a
"U" shaped cross section, no matter how deep or shallow, it should
not (technically) be called a chisel, but is a gouge. Also, a chisel
can have a curved cutting edge that is all in the same plane as the
body of the tool. The amount of curve on a gouge's cutting edge is
known as the sweep
but there are no standards for measurements, so different manufacturers
describe sweep differently and some care is needed when comparing tools
from different manufacturers. Sweep is also known as "smile", although
I have not often seen that terms used. When a gouge has a cylindrical
barrel with a "U" shaped channel cut out of it, that channel is called
the cannel.
Both chisels and gouges are normally mounted on a wooden handle by way
of a tang or
a socket
although in recent years, lathe gouges with metal handles have become
popular. Despite the relatively high expense of these metal handles,
they can be cost effective because they have set screws to
allow them to be used with multiple blades (although only one at a
time, of course).
chuck --- A clamping device
that holds a tool or the material being worked on in a machine with a
rotating action such as a lathe
or drill press. Chucks for lathes may be designed to hold a
workpiece by either compressing around its base or expanding into an
existing cavity and they may consist of a set of jaws or a set of
arcs or even a single screw.
Also, some lathe chucks do not hold the workpiece directly but rather
hold a face plate
to which the workpiece is attached. Drill press
chucks always press in on whatever is being held, usually a cutting bit, not a
workpiece, but sometimes workpieces are rotated in a drill press for
various operations. Chucks are normally tightened with a chuck key but some
chuck are "keyless" and work with by the user twisting the end of the
chuck. Battery operated hand drills often have keyless chucks.
Here are some examples of both drill chucks and lathe chucks:
DRILL CHUCKS:
LATHE CHUCKS:
chucking --- The process of
mounting a workpiece in a chuck.
The opposite is unchucking.
chuck key --- A metal rod,
often bent in a "L" shape or with a cross-bar on one end, with grooves
that mate into an area in a chuck
and when turned cause the chuck to open and close. Examples:
clearance angle --- The angle between the bevel at the end
of a tool (generally a chisel)
and the surface of the workpiece to which the tool is being applied.
collet chuck --- (1) synonymous with collet
collet chuck --- (2) A homemade chuck for use on a wood lathe; it
consists of a hollowed-out cylinder with splits cut out in the end and
using a pipe clamp
to tighten the end down around the workpiece. The name is rather
obvious since it looks just like a collet. These are
most often used for small turnings such as bottle stoppers. Examples:
compression chuck ---
Another name for a four
jaw chuck or a three
jaw chuck when it is being used in a way that
catches the outside of a rim of wood (e.g. on the bottom of a bowl) by
compressing down onto it. Compare/contrast to expansion chuck.
cone center --- Can be either
a live center
or a dead center
with a cone shaped point for use in the tailstock spindle
of a lathe
to support a spindle
for turning.
cone chuck --- synonymous with cone center, although
it seems incorrect to me to call a center
a chuck
since a center just pushes against a workpiece whereas a chuck grabs
it.
coring system --- see bowl coring system
corner scraper --- synonymous with spear point chisel
cove --- A semicircular, oval, or
"U"-shaped concave depression (that is, a hollow area) running around
the circumference of a spindle
turning or across the face or edge of a flat piece of wood or along the
length of a strip of molding
or along the length of a spindle. Examples:
cup chuck --- A cylindrical chuck for use on a lathe that has a cross
section that looks like a pretty square letter "U" (or a steep-walled
cup, thus the name) into which a workpiece can be pressed. Sometimes
taken as synonymous with spigot
chuck but a cup chuck can be quite shallow whereas
a spigot chuck (jam chuck) is always relatively deep.
cutoff tool --- synonymous with parting tool
dead center --- [noun] A cone
center that goes in the tailstock spindle of a lathe
but which does not revolve with the work.
dead center --- [adjective] Exactly in the center
deep fluted gouge --- synonymous with bowl gouge;
compare/contrast to shallow fluted gouge, which is synonymous with spindle gouge. That
is, bowl gouges have a relatively deep flute
and spindle gouges have a relatively shallow flute, thus the alternate
names.
detail gouge --- This term
is sometimes used as synonymous with "fingernail gouge", which is a a spindle gouge with
a fingernail grind.
However, there is a distinction that many manufacturers make, which is
that the gouge they call a detail gouge has a more shallow cannel than a spindle
gouge. The name "detail" comes from the fact that they are great for
working on fine details in a spindle
turnings. There is an even MORE shallow cannel
version that is called a shallow
detail gouge. The examples in the composite pic below
include both spindle gouges with a fairly shallow flute and a fingernail
grind, and also what are more appropriately called detail gouges
because of their very shallow flute:
diamond parting tool
--- A lathe tool;
This is a variation on the standard parting
tool in which the sides of the tool are expanded
outward so that it has a diamond-shaped
cross section which gives the tool extra rigidity. The shape also makes
the tool useable in face
turning moving directly in towards the headstock, which could
not be done without the clearance this shape provides at the top and
bottom of the shank.
Examples:
diamond point chisel --- synonymous with spear point chisel
diamond point scraper --- synonymous with spear point chisel
diamond side cutting scraper --- see side cutting scraper
dish --- See lathe
turnings.
donut chuck --- A homemade jig for finishing the
bottom outside of bowls after all of the upper part, inside and
outside, has been turned on a lathe.
It consists of two sheets of plywood
(other material could be used but plywood is highly recommended for
these jigs), one solid to attach to the faceplate and the
other with a hole in it for the bowl, and 3 or 4 bolts holding the two
sheets together and parallel to each other in a way that captures the
bowl, centered properly so that the bottom can be turned. That is, the
face of the bowl goes flush
against the faceplate piece of plywood and the other piece comes down
over the bottom of the bowl, leaving enough bottom exposed to be
turned, and the bolts then keep the bowl locked in place for turning.
Examples:
dovetail scraper --- A lathe tool; a form of
sidecutting scraper
that is used to make a dovetail
cut in the back side (base) of a bowl so that it will fit snugly into a
similarly shaped surface on an expansion
chuck. Examples:
drive center --- A center support for a lathe that has a cone
point in the center for placement but more importantly has gripping
projections (generally either 2 or 4) that press into the end of the spindle so as to
transfer the rotational force from the chuck
to the workpiece. Drive centers are used in a chuck on the headstock of a lathe.
Also called a "spur drive". See also centers.
Examples:
enclosed form --- A term that is synonymous with open form, as weird as
that sounds. I think the use is taken from the point of view of a bowl,
from which point of view the item looks relatively closed, rather than
from the point of view of a "hollow form" from which point of view it
looks relatively open.
end grain turning --- Any turning in which the gouge cuts directly across
the end grain
of the wood. The problem with end grain turning is twofold. First, if
your gouge isn't razor sharp you run the risk of crushing the end grain
fibers rather than slicing them, and second, end grain turning,
especially on really hard woods, dulls the gouge cutting edge very
quickly compared to side grain or face grain turning.
expansion chuck ---
Another name for a four
jaw chuck or a three
jaw chuck when it is being used in a way that
catches the inside of a rim of wood (e.g. on the bottom of a bowl) by
expanding into it. This is often done with chuck surfaces that mate
with an angled inside rim made with a dovetail scraper.
Compare/contrast to compression
chuck.
face bead --- A bead
that is turned on the face of a face
turning workpiece. For example, all three of the
raised areas in the example below could be considered face beads, but
the one in the middle of the three is unquestionably a face bead.
Examples:
faceplate --- A metal disk
with holes for mounting screws for a wooden piece (usually a bowl) that
is to be turned on a lathe.
The central part of the back of the faceplate either has a threaded shaft
or other mounting mechanism that goes onto the lathe in place of a chuck. The number of screw
holes for use in mounting the workpiece can vary from 3 up to a dozen
or more and on some faceplates, the "holes" are long slots that allow
for variable positioning of the mounting screws. Examples:
faceplate turning --- A
type of face turning
on a lathe
where the object, most often a bowl, is attached to the headstock by way of a faceplate and the tailstock is not used
at all. Unlike spindle turning, at least some of any faceplate turning
will be directly against the endgrain and this often requires extra sharp lathe tools so as to
avoid crushing the end grain instead of slicing it. Compare/contrast to
spindle turning.
Example:
face turning --- A type of lathe turning where the
object being turned is supported entirely on the headstock by either a faceplate (in which
case, the type of turning may be called faceplate turning)
or a chuck
but in either case is not supported at all by the tailstock. Face
turning is typically the turning of a bowl or vase, but could be any
object. Unlike spindle turning, at least some of any face turning will
be directly against the end
grain and this often requires extra sharp gouges so as to avoid
crushing the end grain instead of slicing it. Compare/contrast to spindle turning.
For an illustration, see faceplate turning.
finger gouge --- synonymous with fingernail gouge
fingernail gouge ---
Refers to a spindle gouge
with a fingernail
grind. These are also sometimes given the name
"detail" gouge because they are great for working on fine details in a spindle turnings.
Note that bowl gouges
are also given a fingernail grind, but are NOT then called fingernail
gouges.
fingernail grind ---
Describes a particular end grinding
shape used on bowl gouges
and spindle gouges.
It differs from a standard end grind
in two ways; first, the angle of the grind along the bottom of the shank is more
sharply back towards the handle and second, the grind along the sides
of the shank is much more acute and long reaching, providing a a much
wider curved cutting edge than you get with a regular grind. This grind
is much preferred by many turners (myself include) because it supports
a wider variety of turning
techniques, but it is correspondingly more challenging for the novice.
Examples:
flat grind --- A flat tool grind that is caused by
using the side of a grinding wheel or the face of a flat sharpening stone.
flat nose scraper --- A lathe scraper; This
scraping tool has a cutting (scraping,
actually) edge perpendicular to the shank and it is
presented to the face of the workpiece parallel to the top of the tool rest, so that it
smoothes out a flat area. Compare/contrast to round nose scraper.
Examples:
flute --- (1) A deep channel cut
in wood (or any other material), usually with a semi-circular bottom,
but it could be oval. On a spindle, a cove that goes around the
circumference is always called a cove but a cove that runs the length
of the spindle is also called a flute.
flute --- (2) The cannel
of a gouge
or any recessed area of a cutting tool's cross-section that conveys
chips away from a cutting edge as the tool rotates (or on a lathe tool,
as the wood rotates against the tool). The flute may be straight, as it
is in a tapered reamer, or it may be curved, as it is in a standard drill bit,
but in any case it will follow the cutting edge. In lathe tools the
flute/cannel runs the length of the shank (or sometimes only a part of
the length) from the cutting edge back towards the handle.
fluted parting tool
--- A lathe tool;
This is a variation on the standard parting
tool and differs from that tool in two ways. First,
it has a tapered shank
and second, it has a fluted
edge which gives it a more aggressive cut than the standard parting
tool. It comes in two varieties, the first is the "standard" version
with a flared shank and the second is the "narrow fluted parting tool"
which has a shank that is straight up and down and narrow, giving a
rectangular cross section with little rigidity. Examples of both types:
formed tool --- A lathe
tool that has been ground to a
particular shape for a special job because the shape is difficult to
make with standard tools and/or because of a need to quickly reproduce
a particular cut. An example of such a tool is the dovetail scraper.
four jaw chuck --- A very
common, versatile, chuck
for a wood lathe
that has (surprise, surprise) 4 jaws,
comes in a wide variety of styles, and takes several types of adaptors
to hold various types of workpieces in various ways. The most common
use for this chuck is to grab a raised rim on the bottom of a bowl, on
the inside by expansion or on the outside by compression.
When the jaws are grab by compression, the chuck is sometimes called a
"compression chuck", and when the jaws grab by expansion, the chuck is
sometimes called an "expansion chuck". The compression/expansion force
is applied via a key,
and the chuck may be a self
centering chuck (i.e. a scroll chuck) or an independent jaw chuck.
Examples:
gap --- (1) An opening between two
pieces of wood. Usually, the implication is that there should not be
such an opening. For example, gaps in the inner plies
of plywood
are not desirable. However, it is possible to have a situation where a
gap is desirable, so the term does not automatically imply a bad thing.
gap --- (2) see bed
gap
ghost --- see ghost
outline
ghost outline --- When turning objects on a lathe, before the outer
rim becomes completely round, there are projections at various places
around the rim and these can be faintly seen at the edges of the
turning workpiece; this is referred to as a ghost or ghost outline.
Using the ghost can be very helpful in determining exactly how to
attack the edge with the lathe
tool to continue the rounding of the edge but
without being overly aggressive and causing chipout while
doing an interrupted
cut.
glue block --- A flat piece of
wood that is glued directly (or indirectly with a Kraft paper
separator) to the back of a workpiece that is going to be face turned and is
then itself mounted on a faceplate;
the glue block avoids getting screw holes in the workpiece.
goblet --- A somewhat vague term,
which I have seen used to describe turned objects that have the shape
of anything from a wine glass (sides pretty much straight up after
curving away from the stem) to what I think of as a goblet shape, which
is more like a cognac snifter. Compare/contrast to other lathe turnings.
Examples:
gouge --- [verb] To cut wood with
the kind of tool described below, and by extension, to make any sort of
channel-like cut into wood, whether deliberately or by accident.
Accidental gouges are unhappy occurances for a turner, as they can
cause considerable rework to remove and can even ruin a piece under
some circumstances.
gouge --- [noun] A sharp-wedge-edged tool with a
curved cutting edge. Gouges fall into two distinct types, lathe (or
"turning") gouges and carving gouges. The sister tool, the chisel, is a straight
sharp-wedge-edged tool. It is the straight vs curved edge that makes
the distinction between the two.
grind --- [verb] In regards to
woodworking, this refers to the action of removing some of the surface
of a metal object by an abrading action, generally by a grinding wheel
or sharpening stone.
grind --- [noun] The shape of a cross section of a blade showing the shape of the grinding edge. For example, a tooth
on a circular saw blade is said to have a "flat tooth grind" if
the top (cutting) edge of the tooth is perpendicular to the body of the
blade and a fingernail
grind is a particular form of grind on a lathe tool
grind angle --- The angle from the shaft of a tool
to the bevel
on the working edge.
headstock --- On a lathe, this is the part
that holds the material to be turned (or hold it on one end in the case
of spindle turnings)
and attaches to a motor that powers the rotation. The headstock may
incorporate the motor directly but more often the motor is below or to
the side and attaches to the headstock arbor via a V-belt.
Illustrated with wood lathe.
high speed steel ---
[HSS] High speed steel
a grade
of steel about 6 times harder than carbon steel
and able to retain a cutting edge 5 to 10 times longer than carbon
steel. HSS tools should be ground on a 'white' (aluminum oxide) grinding wheel.
hollow form --- A term wood
turners use to describe a turned container that has only a small
opening through which the turning tools can be inserted while the
turning the inside. It is difficult to turn such items, and
particularly difficult to get the wall thickness consistent, because
the turner is working blind. There are elaborate (and sometimes
expensive) mechanical contraptions (see captive hollowing tool)
that assist in the turning of the inside of such items. The term
"hollow form" is somewhat vague and you might see identical forms
referred to by one turner as a hollow form and by another as a vessel, a vase, or an urn. I have attempted to
clarify the distinctions with a description of the various lathe turnings.
Examples:
hollow grind --- synonymous with hollow ground
hollowing tool --- A lathe tool; this is a
somewhat generic name for any number of different lathe tools that all
have the same purpose, namely that of hollowing out the inside of a
turned vessel (e.g. a vase). There are versions that have replaceable
tips and numerous differently shaped solid tip versions. When the shank has a bend
in it to facilitate reaching behind the inside of the lip of the
vessel, the tool is sometimes called a swan neck hollowing tool.
For very elaborate versions with articulated arms, see captive hollowing tool.
Here are some examples:
inboard --- see inboard turning
inboard bowl scraper
--- synonymous with bowl
scraper. That is, the "normal" bowl scraper is what
is otherwise also called an "inboard bowl scraper" to distinguish it
from the similar outboard
bowl scraper. See also inboard turning.
inboard turning --- When
an object is turned on a lathe
for face turning
the rotation is normally counterclockwise
as seen looking into the headstock,
so the tool rest
is placed on the left side of the object being turned and the left side
of the lathe tool
cuts into the object as it moves down past the tool rest. This is
called inboard turning. When it is necessary to turn the rear of an
object that is mounted for face turning, then the object is moving in a
clockwise direction as you look at it from the rear, and the cutting
edge of the lathe tool has to be on the right side of the tool, for
what is called outboard turning. Some lathe tools (e.g. bowl gouges), this
doesn't matter because the tools have cutting edges on both sides and
so can be used either way. Some tools however (e.g. bowl scrapers, have
the cutting edge on the side and there have to be separate versions for
inboard and outboard turning. Compare/contrast to outboard turning.
in-cannel --- The
characteristic of a gouge
that has its ground and sharpened end section on the inside of the
blade. In-cannel blades are used to carve or turn concave
surfaces. Compare/contrast to out-cannel.
Examples (actually these are all the same gouge drawing, just seen from
different angles):
independent jaw chuck
--- A type of chuck
where each jaw
is controlled independently rather than all being controlled together
as in a scroll chuck.
It can be a 3 jaw or 4 jaw chuck (or even more). There are three
advantages to this type of chuck over a self centering chuck
such as the scroll chuck. The first is that the centering can be fine
tuned to minimize runout,
the second is that it can hold irregular shaped objects, and the third
is that it allows for off-center turning. The disadvantage of this type
of chuck is that it HAS to be adjusted for centering, which makes it
more time consuming to use than a self centering chuck. When looking at
a chuck it is immediately apparent whether it is a scroll chuck or an
independent jaw chuck because unlike the scroll chuck which has only
one adjustment hole, the independent jaw chuck has an adjustment hole
with every jaw. Examples:
index head --- synonymous with index plate
index plate --- A plate used
to lock a tool's drive-shaft into a series of pre-set regular
positions. An index plate on a lathe,
for example, provides a way to hold a spindle
in several regularly-spaced positions to allow a lengthwise operation
to be performed on it from the top or side.
inset bead --- A bead which is surrounded by
wood that is more or less flush
with the top of the bead. See the term bead for illustrations.
Compare/contrast to standing
bead.
interrupted cut --- The
action of a lathe tool
when it is cutting a non-yet-round object on a lathe; the tool is
cutting wood during some of the workpiece's revolution but just sitting
in the air for part of the revolution. Tools are harder to control
during interrupted cuts than in full cut work, and care must be taken
during interrupted cuts to avoid causing chipout.
Irish grind --- synonymous with fingernail grind
Jacob's chuck --- A particular type of drill bit chuck which can also be
held in the headstock
or tailstock
of a lathe.
This is a little like "kleenex" --- it's a word that started out as a
proprietary name but is now used as pretty much synonymous with "drill
bit chuck". It can also be used to hold a small workpiece, instead of a
drill bit, so that the workpiece will rotate in the lathe or drill
press. Examples:
jam chuck --- sometimes synonymous with spigot chuck,
sometimes synonymous with cup
chuck.
ladyfinger gouge --- synonymous with spindle gouge
lathe --- see wood lathe (there are
metal lathes too, but this is, after all, a glossary about wood, not
metal).
lathe box --- This is a rarely
used term that distinguishes round "boxes" from rectangular boxes. In
normal English, "box" carries a connotation of "rectangular" whereas in
wood turning, it does not, since round "boxes" turned on a lathe are just called
boxes (which is why I say that the term "lathe box" is rare). Anyway, a
lathe turned box is a turned container with upper and lower sections.
The parts often have their outer surfaces turned first as a single
unit, then they are separated (parted)
using a parting tool
and their insides are hollowed out separately on the lathe with the
rims turned in a way to make the upper part be a form-fitting top to
the lower part. Lathe boxes tend to have sides that are straight up and
down as opposed to the more curved form of other type of lathe
turnings. Compare/contras to other lathe
turnings. Examples:
lathe check --- The condition
of the underside of veneer
sheets as they come off of a veneer
lathe. This is described in some detail with the
term loose.
lathe chisel --- A chisel used in turning on
a wood lathe.
In colloquial use, the term includes tools that are technically lathe gouges and
includes most of the tools shown in this glossary that are listed with
the term lathetools.
Lathe chisels tend to have longer handles than other chisels because
they have to provide leverage against the force of the turning wood
into which they are inserted.
lathe chuck --- see chuck
lathe gouge --- A lathe tool; a sharp,
curved edge cutting tool with a an oval or cylindrical barrel. The
barrel has a 'U' shaped portion (sometimes a "V" shaped portion) called
the cannel,
or the flute,
removed from its upper section, sometimes all along the length,
sometimes only along the first few inches back from the cutting tip.
The edge is sharpened and honed
and the gouge is used with the resulting sharp bevel cutting into
the surface of wood revolving on a lathe.
There are three main types of lathe gouges. (1) The roughing spindle gouge,
which is used, as the name suggests, to rapidly remove large portions
of wood. (2) The spindle
gouge, also called a "shallow fluted gouge", which
is used primarily to do spindle
turnings. (3) The bowl
gouge, also called a "deep fluted gouge", which is
used for face turnings.
Despite those designations for "typical" use, bowl gouges can be used
for spindle turning and spindle gouges can be used on face turning,
although in both cases this is often not a good idea. The lengths of
lathe gouges vary quite a bit, from as little as 6 or 8 inches for
turning very small objects on a mini-lathe, up to 2 feet long, or even
more, for doing large turnings. The long handles are to provide leverage so
that the turning wood doesn't grab the end of the gouge and jerk it out
of the operator's hand, and the bigger the turning, the longer the
handle needs to be to provide good leverage. The distance from the toolrest to the
workpiece is also a large factor in the leverage. Bowl gouges tend to
be longer and heavier than spindle gouges and they have a deeper flute/cannel. See also lathe scraper, carving gouge,
and lathe
gouge shape comparison
lathe scraper --- A lathe tool; a flat
piece of steel
with a rectangular cross
section . There is a handle on one end and a flat
or curved edge on the other end that is beveled and
ground to a cutting edge. The cutting edge is used in a scraping action when
working on a turning in a wood
lathe. There are several different types of lathe
scrapers, all of which are pointed to in the term lathe tools, but the
two primary types are the round
nosed scraper and the flat nosed scraper.
lathe tools --- This is a bit
of a misnomer, albeit a widely used one. "Lathe tools", to be
completely correct, would include tool rests, chucks, gouges, chisels
and possibly some other tools, but the term is actually used fairly
widely to refer just to the CUTTING tools used with lathe turning, and
that's how I use it here. Those cutting tools include occasional
specialty tools other than those listed below, but this list covers all
normal lathe tools and the terms associated with them, and each points
to a separate definition, most with illustrations. I have also included
some terms that are not tools (e.g. fingernail grind)
but which help explain the tools and their uses
lathe turning --- [verb
phrase] To use a lathe
to turn an object, via either spindle
turning or face
turning using a lathe
tool.
lathe turning --- [noun] An item turned on a lathe. There are
numerous shapes, and there is no central authority to provide exact
definitions of the terms used to describe them, and turners are a
clever crew, always creating variations that defy strict definition,
but I think most turners would pretty much agree with the following
more or less, maybe, sort of, with caveats, if they are not in a
cantankerous mood. Also, please note that for some of these, the term
as used by woodworkers may not correspond exactly to the sense that the
word has in normal English usage; I am only concerned with how the
terms are used by woodworkers.
Below this set of definitions is a composite drawing showing a single
sample shape of each many of the forms. The terms themselves are linked
to a more extensive definition where there are generally composite pics
of numerous examples of the corresponding form.
- bowl
--- Generally, the height is less than the diameter (but it could be a
little more) and the rim is the largest diameter. If the rim curves
back in towards the center, the object is more likely to be called an
"open form" and if it curves back to a very small opening, the object
is a "hollow form". The range of shapes that are called bowls is QUITE
large and the difference between "bowl" and "vase" is sometimes
debatable.
- box
--- A more-or-less "pot"-shaped turning that has a lid which fits
fairly snugly, often VERY snugly. Typically, "boxes" are fairly small
in diameter (over 6 to 8 inches would be rare) but there is nothing in
the definition that requires them to be, although bigger ones tend to
be called "lidded vessels", as do ones that differ significantly from
the "pot" shape. "Boxes" are sometimes turned with wings in which case
they are often more curved than normal "boxes" (see "winged box").
- chalice --- A goblet or pedestal bowl
intended to hold a drink. I don't list/show this separately in this
glossary because I rarely see it used with wooden objects and I feel
that it is something of an affectation when it IS used since "chalice"
more normally designates an ornately decorated metal object.
- dish --- This is not a term I have often
encountered in wood turning. It seems to be a shallow "bowl" or a deep
"platter", where the height is less than half the diameter and the
whole thing is modest in diameter (if the diameter is large, it's more
likely to be called a "platter"), but I have seen this so seldom that
I'm not including it as a separate term outside this list.
- enclosed form --- A term that is
synonymous with "open form", as weird as that sounds. I think the use
is taken from the point of view of a bowl, from which point of view the
item looks relatively closed, rather than from the point of view of a
"hollow form" from which point of view it looks relatively open.
- goblet
--- A somewhat vague term, which I have seen used to describe turned
objects that have the shape of anything from a wine glass (sides pretty
much straight up after curving away from the stem) to what I think of
as a goblet shape, which is more like a cognac snifter.
- hollow form
--- Has an opening that is significantly less than the maximum
diameter. Generally the side will curve out and then back in, not be
straight up and down. If the opening is fairly large, the object is
more likely to be called an "open form". The difference between "hollow
form" and "vase" is often non-existent and the decision on which term
to use can be arbitrary/
- knuckle buster --- This is a humorous
reference to the fact that when turning items with deep wings (see
"winged bowl" and "winged box") the wings act like propellers and the
careless turner, who will not find it even REMOTELY amusing, can get
the dickens smacked out of his fingers/knuckles.
- lidded bowl --- Sometimes synonymous
with "box", but if the object is quite oval and has a lid, then many
turners will call it a "lidded bowl" instead.
- lidded vessel
--- Generally, an "open form" (but it could be a "vase" shaped turning)
but with a lid. Lidded vessels tend to be bigger than "boxes" and have
more curve in the sides and the lid usually is slightly loose as
opposed to the close-fitting lid of a "box". A tall, relatively slim
"lidded vessel" is likely to be called an "urn", especially if it has a
pedestal or foot on the bottom. NOTE: many turners do not designate
much of ANYTHING as a "lidded vessel", preferring to call the item
whatever it would be called without the lid. Thus an "open form" with a
lid is often just called an "open form", not a "lidded vessel".
- natural edge
--- A turned item, most often a "bowl" or a "vase", that still has the
bark from the tree on its rim or at least has the raw area where the
bark used to be.
- open form
--- The opening is larger than the base but significantly smaller than
the maximum diameter. If the opening is really small, it's a "hollow
form" and whatEVER the size of the opening, it might well be called a
"vase" depending on which side of the bed the turner got out on that
morning.
- open
segmented bowl --- A "segmented bowl" that has
empty spaces among the pieces.
- pedestal bowl
--- A "bowl" that sits on top of a shorter turning designated a
"pedestal". The pedestal COULD be turned from the same integral piece
of wood, but often is turned from a different wood glued to the upper
"bowl" portion.
- platter
--- A very shallow, flat "bowl", with a diameter significantly larger
than the height. Anything more than a couple of inches high is not
likely to be called a "platter" and even that is high unless the
turning is a couple of feet in diameter.
- pot
--- The height and diameter are approximately the same, opening is
pretty much equal to the diameter, sides are straight up. Like a
standard kitchen cooking pot, this item is pretty much square in cross
section, but unlike a cooking pot, it has no lid (if it had a lid, it
would be called a "box".
- segmented
bowl --- A "bowl" (and actually some of the other
forms listed here are also done in segmented form) that is made up of
glued-up piece of wood that are usually from at least a few different
species and arranged in a geometric pattern. If there are empty spaces
among the pieces, it is an "open segmented bowl".
- spindle
--- long and skinny and not hollow (a table leg is a "spindle")
- urn
--- A turning that is "vase"-like in proportion but with a smaller
opening, like a "hollow form", and with a snug lid. The distinction
between "urn" and "lidded vessel" is sometimes debatable. "Urns"
typically have a "pedestal" or "foot" at the bottom. Like normal
English usage, "urn" MAY mean a cylindrical container that holds
cremated ashes.
- vase
--- The height is more than the maximum diameter (often quite a bit
more) and the opening is anything from the maximum diameter to a little
less than the maximum diameter. If the opening is significantly less
than the maximum diameter, it's usually called a "hollow form" but
usage of these terms varies considerably. A slim vase with a top would
be an "urn". The difference between "bowl" and "vase" is sometimes
debatable and the difference between "urn" and "vase" is not debatable
only because an "urn" has a lid and a vase doesn't.
- vessel --- A term that is used for
damned near anything in this list; too vague for me to try to pin it
down any further.
- winged bowl
--- A bowl with "wings" that flow from the upper rim back downwards, or
sometimes straight out, and sometimes upwards. Downward drooping wings
may stop short of the bottom of the bowl or they may go down so far
that the bowl is supported by the tips of the wings rather than the
bottom of the cavity part of the bowl and when this is the case, the
bowl is called a "lifted bowl"? or "raised bowl"? or something like
that --- I need some help here.) "winged bowls" are sometimes tuned in
a way that allows them to be given tops, in which case they are called
"winged boxes".
- winged box
--- A "box" with "wings" that flow from the upper rim back downwards,
or sometimes straight out. Downward drooping wings may stop short of
the bottom of the box or they may go down so far that the box is
supported by the tips of the wings rather than the bottom of the cavity
part of the box and when this is the case, the box is called a "lifted
bowl"? or "raised bowl"? or something like that and the "box" is often
turned with an underside that is more round that would be the case on a
normal "box".
RELATED TERMS:
- art --- A turned item with a high price.
- craft --- A turned item with a medium
price.
- junk --- A partially turned item
currently in flight across the shop ("Uh, Houston, we have a problem!")
SAMPLE FORMS (intended to be at least vaguely representative of the
various shapes):
lidded bowl --- Sometimes synonymous with box, but if the object
is quite oval and has a lid, then many turners will call it a "lidded
bowl" instead. Compare/contrast to other lathe turnings.
lidded vessel --- In wood
turning, this generally refers to an open
form (but it could be a vase-shaped
turning) but with a lid. Lidded vessels tend to be bigger than boxes and have more curve in
the sides and the lid usually is slightly loose as opposed to the
close-fitting lid of a "box". A tall, relatively slim "lidded vessel"
is likely to be called an urn.
Compare/contrast to other lathe
turnings. Examples:
live center --- A cone center
which revolves with the work. Compare/contrast to dead center.
Longworth chuck --- A very simple, clever design for
a homemade jig
that acts as a bowl chuck
for turning the bottom of bowls which have already had all of their
upper surfaces (inside and out) turned. It consists of a pair of plywood (or
other material) circles with crossing arcs in which you put bolts with
rubber covers to protect the wood. There are instructions on the
Internet for making them. Examples:
multijaw chuck --- A lathe chuck with more than 4 jaws.
multi-tip scraper --- A lathe tool that has a
removable tip that can be easily replaced when dull and/or with
differently shaped tips for different uses. The tips are typically high speed steel
or even carbide.
Numerous manufacturers make various versions of these. Examples:
narrow fluted parting tool --- see fluted parting tool
natural edge --- An
unfinished edge of a wooden object that retains the outer portion of
the tree; a term most often used in describing the lip of a turned bowl in which the natural
outer edge of the tree, often (but not necessarily) including the bark, is left
untouched. Examples:
negative rake scraper --- A lathe tool that is a
normal flat nose
scraper with part of the top ground off so that
both the top and bottom come off the shank at an angle.
This reduces the "grab" of the scraper but the main characteristic is
that it reduces the amount of material removed, and is thus very much a
finishing tool, and would not be at all effective for hogging. It
also allows the handle to be below the burr instead of
above it, which some turners feel gives better control for fine finish
turning. At the time of this writing, I have it on anecdotal
information that there are not yet any vendors producing negative rake
scrapers, so turners make their own by grinding off a large bevel on
the top side. These tools are ideal for finishing scrapes on very hard
wood and have been used for centuries by luthiers, who apparently make
their own. A similar effect can be had by turning a skew chisel flat on
its side and using it as a scraper, but skew chisels have a much
sharper edge and are thus less amenable to a stable burr. Examples:
offset turning --- Turning objects on a lathe in a way such that
for some portion of the length of the workpiece while turning, the
center line of the object is NOT in line with the centerline of the
lathe. One or both ends of the object are positioned such that their
center is offset from the turning center of the center or chuck. Think of the
crankshaft of a car. In woodworking, this is done for decorative
effects.
Oland tool --- A homemade lathe tool designed
by Knut Oland, with construction instructions available on the
internet. it is a multitip
scraper. It consists of a steel rod drilled
out at the end to accept a machine lathe bit and with whatever kind of
handle you choose to put on it (I've seen some with masking tape as the
handle). It's inexpensive and fairly easy to make and by all reports
makes an excellent turning tool and it has the advantage that you can
replace the tip. Examples:
open form --- A wood turning
item that has an opening larger than the base but significantly smaller
than the maximum diameter. If the opening is really small, it's a hollow form.
Compare/contrast to other lathe
turnings. Examples:
open segmented bowl
--- A type of segmented
bowl that has empty spaces among the pieces;
generally these are regularly spaced but some designs have them
distributed irregularly. Examples:
outboard --- see outboard turning
outboard bowl scraper
--- See full discussion give with the term bowl scraper.
Examples:
outboard turning --- Face turning which
is carried out on an extension of the drive-shaft on the left-hand side
of the headstock,
ie the opposite side to the bed.
Some lathes have headstocks that swivel around away from the bed, thus
allowing outboard turning to be done using the same spindle as inboard
turning, and some simply mount the faceplate
or chuck on
the opposite site of the headstock, away from the bed. In that case,
then relative to the turner the workpiece will revolve in the opposite
direction as compared with turning over the bed; as a consequence the
drive spindle
and attachments (e.g. chuck or faceplate) require reverse threads.
Outboard turning in those cases where the workpiece goes in the
opposite direction from normal requires tool use on the opposite side
of the workpiece, and some tools (e.g. outboard bowl scraper)
have special versions for that use. Other tools (e.g. bowl gouge are
symmetrical and can be used for inboard or outboard turning.
Compare/contrast to inboard
turning.
out-cannel --- The
characteristic of a gouge
that has its ground and sharpened end section on the outside of the
blade. Out-cannel blades are used to carve or turn convex surfaces.
Compare/contrast to in-cannel.
Examples (actually these are all the same gouge drawing, just seen from
different angles):
oval skew chisel --- A skew chisel that has
an oval cross section taken perpendicular to the length of the chisel.
The point of having the oval sides is that this makes it easier to
rotate the tool on the tool
rest for variable slicing angles as it is moved
over a variable workpiece surface. For an extreme example of this, see
the round skew chisel
Examples:
paper joint --- Despite containing the word "joint",
this is not a joinery
term but rather a description of the use of paper (generally Kraft paper
as a separator when gluing a glue
block to a workpiece for face turning so that
the glue block gets the screws from the faceplate rather than
having them go into the workpiece. Paper joints are also sometimes used
in spindle turning
when it is desired to turn a spindle
that is actually two or four sections glued up to be turned together
before being applied separately. The paper joint makes it easy to
separate the parts of the spindle once it has been turned.
parting --- [verb] In lathe turning, the use of
a parting tool
to separate a spindle
turning into two parts, typically to either (1) cut
off the waste portion at the end of a turning or (2) so that the parts
can serve as the upper and lower halves of lathe boxes. Parting
can also describe the separation of a face turning from
the faceplate.
parting tool --- A lathe tool that is
used to separate a spindle
turning into two parts, typically to either (1) cut
the work piece off from the waste portion at the end of a turning or
(2) so that the parts can serve as the upper and lower halves of lathe boxes. There are
four flavors of the tool, all with the same fundamental purpose, as
follows:
pattern stick --- A thin,
flat piece of wood on which is cut (with a scroll saw or fret saw) the
outline of what a spindle
turning is supposed to look like. That is, the
silhouette of the finished turning should have the exact same contour
as the edge of the pattern stick. This is particularly useful when
making multiple identical copies of a turning. The pattern stick can be
held right up against the turning to judge how high or deep to make beads and coves and other turning
features. There is a similar, but less extensive tool called a story stick.
pedestal bowl --- A bowl that sits on top of a
shorter turning designated a "pedestal" or "foot". The pedestal COULD
be turned from the same integral piece of wood, but often is turned
from a different wood glued to the upper "bowl" portion.
Compare/contrast to other lathe
turnings. Examples:
penblank --- A piece of wood that is destined to be
turned into a pen on a lathe.
Usually about 3/4" x 3/4" x 6" and made of exotic wood.
planing cut --- The cut made by a skew chisel on a wood lathe when it is
used in its "standard" way with the edge at about 45 degrees to the
edge of the turning spindle
just above the the centerline.
The cut made is very similar to that made by a hand plane,
thus the name.
platter --- A very shallow, flat
bowl, with a
diameter significantly larger than the height. Anything more than a
couple of inches high is not likely to be called a "platter" and even
that is high unless the turning is a couple of feet in diameter.
Compare/contrast to other lathe
turnings. Examples:
plunge cut --- In lathe turning,
pushing the lathe tool
straight into the wood. Compare/contrast to sweep cut.
pole lathe --- An old-style
human-powered lathe
used for spindle
turning green
wood. The operator pushes a treadle down with his foot and this bends a
long springy pole that is attached to the treadle by a rope and it is
the spring action of the pole that returns the treadle to the up
position ready for the next downward push from by the operator. Such
lathes require different style tools than a powered lathe. They have
been in use for thousands of years but are today a very rare hobby tool
in the industrialized countries, not used commercially since about
WWII.
pot --- A turned item in which the
height and diameter are approximately the same, the opening is pretty
much equal to the diameter, and the sides are straight up. Like a
standard kitchen cooking pot, this item is pretty much square in cross
section, but unlike a cooking pot, it has no lid (if it had a lid, it
would be called a box.
See lathe turnings
for an illustration of the shape and compare/contrast to the other
lathe turnings shown there.
precision combination chuck --- A once-popular
proprietary chuck
with attachments which can perform many of the functions performed by
other chucks because it includes both expanding or contracting collets.
Modern scroll chucks
do pretty much the same things.
pressure chucking --- The process of pushing a live center on a tailstock onto a piece
that is pressed up against a faceplate
on the headstock
so that the workpiece is held in place by the pressure rather than
being held by a chuck.
This has the advantage of very quick chucking and unchucking of the
workpiece, but the disadvantage of being it being more difficult to get
good centering on the workpiece.
pyramid point tool ---
A lathe tool
that is a cylindrical steel rod with the point ground down to a
3-faceted pyramid shape; used for turning beads
and other spindle
turning
radius skew chisel ---
A lathe tool;
a variation on the skew
chisel in which the cutting edge is curved,
allowing more flexibility in some types of cuts. Examples:
reverse chucking --- Mounting a face turning
backwards so that the other side can be turned. This is most commonly
applied to turning bowls, where the inside of the bowl and the upper
outside is all turned and then the bowl is reversed into any of various
kinds of chucks
so that the outside bottom can be turned.
ring center --- A live center or a dead center in a lathe tailstock which has a
small point set in the middle of a ring. The point sticks out a little
further than the edge of the ring and locates the center and then the
ring presses into the surface of the spindle
thus limiting the penetration of the point but providing strong support
for the spindle. This helps to prevent splitting and is particularly
useful for built-up (laminated)
spindles. See also centers.
ring tool --- A lathe tool; a steel
cylinder (ring) with a cutting edge all the way around one end,
sharpened with a grind
on the inside of the cylinder, and usually mounted via a rod that is
brazed or welded to one side of the cylinder so that the inside of the
cylinder is totally free for chips to move through as the tool is used
to remove material from a lathe turning. The "ring tool" is not at all
the same beast as the captive
ring tool. Examples:
roughing gouge --- A lathe tool used in spindle turning
for quickly reducing square stock to a round section. It has a
semicircular cross section and is ground square
across the cutting end. The bevel
angle should be around 35° to 45°. A roughing gouge is for spindle work
and should not be used for face
turning, as the upper edges, which are not swept
back like those on a bowl
gouge will tend to catch on face turnings.
Examples:
roughing out gouge --- correct term Spindle roughing gouge
rough turning --- The lathe
process of turning a square cross
section turning stick into a round (dowel-like)
shape, or turning a rectangular bowl blank into a roughly bowl-shaped
object.
round nose scraper ---
A lathe scraper
that has a rectangular cross section and a rounded nose used for
scraping the work. This tool may be held flat on the tool rest, or
sometimes angled to produce more of a shearing action than a scraping
action, but you have to be careful when doing that because the sharp
edge of the tool will dig into the tool rest, possibly causing the need
for more frequent dressing
of that surface. The scraping edge of this tool may have the type of grind that is similar to
that in the flat nosed scraper in that there is a constant angle to the
flat top of the tool, or it may have what is more of a fingernail grind.
Most of the examples in the composit pic below are the flat grind but
the one directly above the fingernail grind illustration in the lower
left corner has the fingernail grind. I use both and find both to be
very effective, but the fingernail grind tools are better suited when
you want a shearing action instead of scraping because they present a
sharper edge to the wood. Compare/contrast to flat nosed scraper.
Examples:
round nose side cutting scraper --- see side cutting scraper
round skew chisel --- An
extreme extension of the much more common oval skew chisel,
this variety is only made by a couple of manufacturers. Like the oval
skew chisel, the point of the curved edge on the tool is to facilitate
rotating the tool against tool
rest for variable slicing angles as it is moved
over a variable workpiece surface. Example:
scraper --- There are two types
of scrapers used in woodworking and each is just called a "scraper"
within its own context but in this glossary I have given them their
full names and each has its own term with a full discussion. First is
the cabinet
scraper which is used to produce a fine surface
finish on flat or lightly curved surfaces, and second is the lathe scraper which
is used to produce a fine finish on curved items in a lathe. Wood
turners do not refer to a "lathe scraper", they just say "scraper" and
likewise, when people are talking about creating a finish on a flat
wood surface, they do not talk about a "cabinet scraper", they just say
"scraper", so the distinction in this glossary using the "full" names
is purely for clarity and does not reflect actual usage.
scraping --- (1) Scraping cuts
on a wood lathe
are specific cuts where the bevel
of the lathe tool
is held clear of the wood and the cutting edge scrapes the surface of
the wood. Scrapers have to be kept very sharp to avoid crushing the
wood instead of scraping it cleanly. The term is also sometimes used to
describe the incorrect use of a tool that should be doing a shearing cut
but which, due to improper presentation of the edge to the workpiece,
is instead doing a scraping cut.
scraping --- (2) Wood surface scraping done with a cabinet scraper
to remove very thin layers of a flat or lightly curved surface.
screw chuck --- A chuck with a single screw, fixed in
the center, to which the workpiece is attached on a wood lathe. Examples:
scroll chuck --- A chuck for a wood lathe (well, OK,
metal lathes use them too). They may have 3 or 4 jaws (or even
more), and the jaws come in various forms, the most common being a kind
of staircase piece of metal and the other being circular arcs (see four jaw chuck for
pics). What all scroll chucks have in common is that the operational
mechanism is based on a scroll
plate which is a spiral-grooved plate that acts as
a gear for the underside of the jaws (see scroll plate for pics). The
good news about scroll chucks is that they are a form of self centering jaw chucks
and are thus easy to use. The bad news is that like all self centering
jaw chucks, they are somewhat sloppy in alignment compared to independent jaw chucks,
and cannot be fine tuned for centering. The jaws either compress inward
on the outside of a cylindrical projection at the back of the blank, or
to expand outward to grip the inside of a hollow cylindrical projection
at the back of the blank. Some versions have flat edges, some have dovetailed
edges for extra holding power. It is immediately apparent when looking
at chuck whether it is a scroll chuck or an independent jaw chuck,
because a scroll chuck only has one adjustment hole whereas on an
independent jaw chuck, every jaw has an adjustment hole. Examples:
scroll plate --- The spiral
grooved plate that is the heart of a scroll
chuck. Examples:
segmented bowl --- A
turned wooden bowl that is not made from a single piece of wood, but
rather from a number of pieces glued together in some design. Segmented
bowls come in a staggering variety of styles and the examples shown
below hardly even touch the surface of showing some of the variety
available. If there are gaps among the glued up pieces, it is called an
open segmented bowl.
The upper middle two are mine. Compare/contrast to other lathe turnings.
Examples:
self centering chuck
--- Synonymous with scroll
chuck; the term emphasizes the fact that scroll
chuck jaws
automatically move synchronously and maintain their centering, unlike
the jaws on an independent
jaw chuck.
shallow detail gouge
--- A detail gouge
that has an extra shallow cannel.
shallow fluted gouge --- synonymous with spindle gouge;
compare/contrast with "deep fluted gouge" which is synonymous with bowl gouge. That is,
bowl gouges have a relatively deep flute
and spindle gouges have a relatively shallow flute, thus the alternate
names.
side cutting scraper
--- A lathe tool;
This term refers to a few differently shaped lathe scrapers that
all have the purpose of scraping
the inside surface of bowls and other containers in face turning and are
rarely used in spindle
turning. They are sometimes quite similar to hollowing tools.
Some have a straight edge scraping surface and are called "diamond side
cutting scrapers" and some have a curved scraping surface and are
called "round nose side cutting scrapers" and some have a rounded
section that merges into a flat section. Some have a bit of a hook,
much like a hollowing tool, but I have not encountered the term "hook
nose side cutting scraper". I've seen one side cutting scraper that has
a long straight scraping edge and is called a "box scraper" but having
found only one vendor for this tool, I have not included it in this
glossary as a term. Unlike bowl
scrapers, side cutting scrapers do not come in inboard and outboard versions,
although I personally have had occasion to wish that they did.
Examples:
skewchigouge --- A lathe tool reportedly
designed by English turner Allan Beecham; works as a both a skew chisel and a gouge, thus the name
skewchigouge. Sold by several manufacturers, it reportedly does not
catch easily and can be used to turn beads,
coves and
most any other shape that can be turned with a skew chisel and/or a
lathe gouge. Examples:
skew chisel --- A lathe tool; a chisel
on which the cutting edge is not square to the sides of the tool but
rather is at an angle (most commonly 30 degrees) off of square. The
cross section taken perpendicular to the long dimension is normally a
rectangle, but if it is an oval, then the chisel is called an oval skew chisel
and there is one extreme case of this where the shank is a
cylinder and the tool is called a round skew chisel.
Skew chisels exist as both carving chisels and lathe chisels. When used
with a wood lathe,
they are present to the spindle
with the cutting edge perpendicular to the axis of the
spindle, thus removing material via slicing, not scraping. Skew chisels
can also be used in exactly the same way as a square nose chisel
but with the added advantage that they can get into slightly recessed
areas whereas the square nose chisel cannot. I use them this way
regularly when doing the versions of my bowls where the bowl surface
extends under the side and a square nose scraper just can't do the job.
One of the problems sometimes encountered with the skew chisel is that
the rectangular cross section presents a sharp edge to the tool rest
when using the tool at an angle (the normal mode of operation) and this
easily catches on the tool rest. Consequently, some vendors produce
skew chisels with slightly rounded edges, like the one in the upper
right corner of the composite pic below, and of course the oval skew
chisel totally avoids the problem. Examples:
socket --- A tapered cylinder
at the end of a tool such as a file
or chisel,
by which the handle is attached. Compare/contrast to tang. Examples:
spear point chisel ---
A lathe tool
that is used to cut sharp corners or "V" shaped grooves. It has a spear
shaped pointed cutting (scraping
actually) edge that is usually ground
to slightly less than 90 degrees since at a full 90 degrees it would be
very unforgiving in scraping out right angles whereas with a little
less, it can be used to work on one edge and then the other without
danger of damaging the surface not being concentrated on. This tool is
also called a "square end scraper" (not to be confused with a square nose scraper,
a "diamond point chisel", and a "diamond point scraper", depending on
the manufacturer. Examples:
spigot --- A rectangular or
cylindrical projection on the end of a workpiece, made to fit into a
recess such as a socket
in a chair seat or in a spigot
chuck.
spigot chuck --- (1) A chuck with a deep recess
into which a spigot
on the workpiece can be driven. In this use, the term is synonymous
with "jam chuck".
spigot chuck --- (2) synonymous with cup chuck although I
think it would be incorrect to call a shallow cup chuck a spigot chuck.
spigot chuck --- (3) synonymous with scroll chuck. I
think this use of the term is incorrect, albeit fairly widespread.
spindle --- (1) synonymous with arbor. See also spindle shaper
spindle --- (2) A long slim cylindrical piece of
wood, usually turned on a lathe, decorative and with axial symmetry.
These are used as staircase rails, the backs of certain types of
chairs, and as a decorative touch on various pieces of furniture.
Compare/contrast to other lathe
turnings.
spindle --- (3) [also drop spindle] A a wooden spike
weighted at one end with a circular whorl; it may have an optional hook
at either end of the spike and is used for spinning fibers into thread
so they can be woven into cloth.
spindle --- (4) An upright spike used to hold papers
waiting for processing.
spindle --- (5) The shaft in either the headstock or tailstock of a lathe (see headstock spindle
and tailstock
spindle).
Examples of definition (2):
spindle gouge --- A lathe gouge
specifically designed for spindle
turning. Spindle gouges are typically lighter and
shorter than bowl gouges
and have a shallower flute,
for which reason they are also called "shallow fluted" gouges. There is
a particular way of shaping the end of a spindle gouge (and it's also
used on bowl gouges)
called the fingernail
grind and when this is used, the tool is sometimes
called a "fingernail gouge". When the flute is particularly shallow,
the spindle gouge is often called a "detail gouge" (because it's great
for doing fine details on spindle turnings), and when the flute is so
shallow that it almost isn't there, the tool is called a "shallow
fluted detail gouge". See also lathe gouge shape
comparison.Examples:
spindle roughing gouge --- synonymous with roughing gouge
spindle turning --- Lathe turning of a long
slender piece with one end attached to the headstock and the
other end attached to the tailstock.
It's called spindle turning for the simple reason that the result is a spindle.
Compare/contrast to face
turning. Example:
spiraling system --- synonymous with texturing tool
spiraling tool --- synonymous with texturing tool
spur drive --- synonymous with drive center
square end scraper --- synonymous with spear point chisel
even though it sounds as though it should be synonymous with flat nose scraper
square nose chisel ---
synonymous with flat
nose scraper
square nose scraper
--- synonymous with flat
nose scraper
standing bead --- A bead which is wholly raised
above the surrounding wood. See the term bead for illustrations.
Compare/contrast to inset
bead.
steady --- synonymous with backsteady
steady rest --- synonymous with backsteady
story stick --- A way to
accurately move dimensions from a template to a
workpiece, this is normally a flat, thin piece of wood on which is
marked (with notches or pencil marks) various points at which a
workpiece needs to be cut or worked in some way. The term is
particularly often used when a spindle
turning needs to have various featured turned. The
story stick is held up against the spindle
when it is first turned to a smooth cylinder and the points are
transferred to the spindle with pencil marks. Story sticks are
particularly useful when making numerous identical copies of a spindle
turning, although when doing that, a pattern stick would
be even more appropriate because the story stick only shows WHERE beads, coves, and so forth go, but
the pattern stick also shows how high or deep they need to be.
swan neck hollowing tool
--- A lathe tool;
this is a somewhat generic name for any number of different lathe tools
that all have the same purpose, namely that of hollowing out the inside
of a turned vessel
(e.g. a vase).
There are versions that have replaceable tips and numerous differently
shaped solid tip versions. Unlike the straight shank on a normal hollowing tool,
this version has a bend in it to facilitate reaching behind the inside
of the lip of the vessel. Examples:
sweep --- (1) Several types of carving gouges
have a cross
section that is in the form of the letter "U" and
it may be very shallow or very deep (but not flat, else the tool would
be a chisel
not a gouge).
The degree of curvature of such cross sections is called the sweep of
the chisel. It is also, less often, referred to as the "smile".
sweep --- (2) The characteristic of a tree that has
a gradual curve in the main stem. Loggers consider this a defect while
landscape gardeners may love it. Beauty is in the eye of the beholder.
sweep cut --- In lathe turning,
moving the lathe tool
parallel to the surface of the workpiece. Compare/contrast to plunge cut. In
carving, this is a slice cut with emphasis on rotating the handle along
the sweep. It is particularly used with deeper gouges which can make
full use of their well shaped sweeps to set in clean outlines.
swing --- The largest diameter
that can be turned on a faceplate
over the bed
on a lathe.
That is, the swing is twice the distance from the lathe centerline (a
line from the center of the headstock
to the center of the tailstock)
down to the closest point on the bed. See wood lathe. On other
tools, such a limiting distance is normally called the throat and is NOT
given as twice the distance. There are lathes that have a dogleg (called a
gap) in the
bed near the headstock to give a larger swing. If it is necessary for
the banjo
to be positioned between the workpiece and the bed in a face turning, then
for all practical purposes, the true swing in that case is the stated
swing minus twice the height of the tool rest.
tailstock --- On a lathe, this is the part
that contains the stationary piece that holds the end of the workpiece
which is being turned by a mechanism in the headstock. For face
turnings, the tailstock is not used in any way. The part of the
tailstock that holds the mechanism (such as a dead center or a live center that in
turn holds the workpiece is called the tailstock spindle.
Illustrated at: wood lathe.
tang --- The tapered end of a
chisel or file or other
woodworking tool that is driven into a handle, or the extension of a
knife blade that the handle is put around. Files and such usually just
have a tang that is a rectangular cross section
extension of the device and this is jammed into a hole in a wooden
handle and remains in place by the pressure of the wood against the
tang. Such pressure fits do come loose sometimes. For knives, the tang
is more complex and there are two basic types, the "hidden", so named
because it doesn't show on the handle and the "full", which becomes a
stripe on both the upper and lower edges of the handle. With knives,
the tang is usually riveted to the handle. Compare/contrast to socket. Examples:
texturing tool --- A lathe tool; a ridged
metal wheel that is pressed against a rotating object on a lathe and
which then produces a grooved decoration in the object. These can be
used with both face
turnings and spindle
turnings. Very skinny versions are often called
"spiraling tools". Examples:
three jaw chuck --- A very
common, versatile, chuck
for a wood lathe
that has (surprise, surprise) 3 jaws,
but with less variety of jaw type than is found in four jaw chucks.
The most common use for this chuck is to grab a raised rim on the
bottom of a bowl, on the inside by expansion or
on the outside by compression.
When the jaws are grab by compression, the chuck is sometimes called a
"compression chuck", and when the jaws grab by expansion, the chuck is
sometimes called an "expansion chuck". The compression/expansion force
is applied via a key,
and the chuck may be a self
centering chuck (i.e. a scroll chuck) or an independent jaw chuck.
Examples:
tool rest --- [also "T rest"] A
part on a lathe,
usually formed in the shape of the letter "T", which fits into the banjo and supports the gouge so that it won't get
kicked out of the operator's hand as it cuts into the wood. The tool
rest will usually become somewhat dented and worn over time and will
need to be dressed
with a file
so as to not cause the gouge to hang up as you move it along the rest.
Illustrated with wood lathe.
turning --- [verb] Creating an
object on a lathe;
using a lathe.
turning --- [noun] An object created on a lathe
turning blank --- see blank
turning gouge --- synonymous with lathe gouge
two jaw chuck --- A chuck
with two jaws;
very rarely used, I believe. Example:
unchucking --- Removing a
workpiece from a chuck.
The opposite of chucking.
urn --- A vase-like vessel,
ordinarily with a top over an upper opening but without handles and
with a foot / pedestal of some kind. In wood turning
the terms urn, vase,
vessel,
and hollow form
are somewhat sloppily interchanged and I have described some of the
distinctions with the term lathe
turnings. Examples:
vacuum chuck --- A lathe chuck in which a vacuum
system is attached to the rear of the headstock
and the workpiece is held in place by atmospheric pressure.
vase --- A topless container with a
round cross section (when taken horizontally) generally used to hold
flowers. In woodturning, vase is a term used for items that you
might also see called a vessel
or a hollow form,
but loosely, the definition is that it is a turned form where the
height is more than the maximum diameter (often quite a bit more) and
the opening is anything from the maximum diameter to a little less than
the maximum diameter. If the opening is significantly less than the
maximum diameter, it's a hollow
form. A slim vase with a top would be an urn. The difference between
"bowl" and "vase" is sometimes debatable and the difference between
"urn" and "vase" is not debatable only because an "urn" has a lid and a
vase doesn't. Compare/contrast to other lathe turnings.
Examples:
veneer lathe --- A machine
on which logs are peeled to yield veneer for plywood or to
produce decorative
veneers with a swirly
figure.
ways --- The bed of a wood lathe normally
consists of two rails of either metal or wood. The rails are
technically called the "ways" and while it is technically correct to
speak of one of them as "a way", it would be more normal to call one of
them "a rail".
wedge tool --- A lathe chisel that is
sold by only a couple of manufacturers and should not be considered as
being among the "common" or "normal" lathetools.
It is just a steel cylinder that is sliced at about 45 degrees to the
long axis and provided with a handle on the other end. Supposedly, it
serves well for both spindle
turning (where it is used to create coves) and for face turning (where
it is used for finishing cuts to provide a smooth surface). I've never
used one but it looks to me as though it would be a little hard to
control on face turnings when using the side as a slicing tool.
Examples:
winged bowl --- A turned bowl with "wings" that flow
from the upper rim back downwards. The wings may stop short of the
bottom of the bowl or they may go down so far that the bowl is
supported by the tips of the wings rather than the bottom of the cavity
part of the bowl and when this is the case, the bowl is called a
"lifted bowl"? or "raised bowl"? or something like that (I need some
help here). "winged bowls" are sometimes tuned in a way that allows
them to be given tops, in which case they could be called "lidded
vessels" but the wings are distinctive so that name prevails (or they
could just be called "lidded winged bowls"). Compare/contrast to other lathe turnings.
Examples:
winged box --- A box with "wings" that flow
from the upper rim back downwards, or sometimes straight out. Downward
drooping wings may stop short of the bottom of the box or they may go
down so far that the box is supported by the tips of the wings rather
than the bottom of the cavity part of the box and when this is the
case, the box is called a "lifted box"? or "raised box"? or something
like that (I need some help here) and the "box" is often turned with an
underside that is more round that would be the case on a normal "box".
Compare/contrast to other lathe
turnings. Examples:
wood lathe --- A machine for
shaping wood by rotating it rapidly along its axis while using very
hard, sharp-edged gouges,
chisels,
or scrapers
to shape the rotating surface. In woodworking, lathes are used to
create table legs, spindles,
bowls and so forth, and then there are huge lathes that are used to
slice certain types of veneer
including rotary
cut veneer and thick softwood veneer
for plywood.
The illustration below shows some of the major parts of a typical
wood-turning lathe. The distance from the headstock to the tailstock determines
how long a piece can be mounted and turned to create a spindle-shaped object,
and the distance from the centerline
of the headsotck/tailstock down to the nearest point on the bed
determines the radius of the largest object that can be turned in face plate turning.
Since it gives a bigger number, and vendors always like bigger numbers,
the diameter of such an object is normally quoted, rather than the
radius, and this is called the swing
of the lathe. In other words, a spec sheet for
a wood lathe won't directly tell you the distance from the head/tail
centers down to the bed but rather will tell you how much twice that
amount is. Wood lathes have a rotatable tool
rest that sits on top of a sliding banjo and the combination
of moveability thus provided allows the lathe tool to be position
anywhere that is needed such that the cutting edge does not hang too
far over the tool rest (if the tool hangs too far over the tool rest,
then the leverage is very poor and a strong catch can either break or
bend the tool, or grab it out of the operator's hand). Example, with
parts labeled: