Grizzly G9729 - Glossary of Terms

G9729 Combination Lathe/Mill
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The following is a list of common definitions, terms and phrases used throughout this manual as they relate
to this lathe/mill and metalworking in general. Become familiar with these terms for assembling, adjusting
or operating this machine. Your safety is VERY important to us at Grizzly!
Arbor: A machine shaft that supports a cutting
tool.
Backlash: Wear in a screw or gear mechanism
that may result in slippage, vibration, and loss
of tolerance.
Collet: A conical shaped split-sleeve bushing
which holds round or rectangular tool and/or
workpieces by their outside diameter.
Cross Feed: Mill—The movement of the table
toward or away from the column.
Lathe—Movement of cutting tool across the
end of the workpiece.
Cross Slide: A fixture attached to the lathe car-
r
iage that holds the compound rest and can be
moved in and out.
Cutting Speed: The distance a poi
nt on a cutter
moves in one minute, expressed in meters or
f
eet per minute.
Dial Indicator: A
n instrument used in setup
and inspection work that shows on a dial the
amount of error i
n size or alignment of a part.
Dividing Head: A mi
lling machine accessory
used to divide a circular object into a number
of equal parts.
Down Milling or Climb Milling: Feeding the
workpiece in the same direction as the cutter
rotation.
End Mill: A cutter with cutting surfaces on both
its circumference and end.
Facing: In lathe work, cutting across the end of a
workpiece, usually to machine a flat surface.
Feed: The movement of a cutting tool into a
workpiece.
Fixture: A device that securely holds the
workpiece in place during cutting operation as
opposed to a Jig which is used to hold and
guide a workpiece through an operation.
Gib: A t
apered wedge located along a sliding
member to take up wear or to ensure a proper
fit.
Headstock: The major lathe component that
houses the spindle and motor drive system to
turn the workpiece.
Lathe Center: A lathe accessory with a 60°
point which is inserted into the headstock or
tailstock of the lathe and is used to support the
workpiece.
Leadscrew: Lathe—The long screw that is driv-
en
by the end gears and supplies power to the
carriage. Mill—The screws that move the table
in longitudinal, transverse, or vertical direc-
t
ions.
Spindle: The revolving shaft that holds and
drives the workpiece or cutting tool.
Tailstock: A moveable fixture opposite of the
headstock on a lathe that has a spindle used
to support one end of a workpiece and for hold-
i
ng tools.
Toolpost: The part of the compound rest that
holds the tool holder.
Turret: L
athe—A machine fixture that holds mul-
tiple tools an
d can be revolved and indexed to
position. Mill—The part of a mill which rotates
o
n the column and can be set to a specific
degree.
Ways: The precision machined and flat tracks on
a lathe or mill on which the carriage, tailstock,
and the mill table and knee slide.
Glossary Of Terms