The following is a list of common definitions, terms and phrases used throughout this manual as they relate
to this lathe 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
Backlash: Wear in a screw or gear mechanism
that may result in slippage, vibration, and loss
Carriage: A main housing that consists of the
apron and the saddle.
Cross Slide: A fixture attached to the lathe car-
riage that holds the compound rest and can be
moved in and out.
Compound Rest: A fixture attached to the cross
slide that holds the tool holder and can be
moved in and out.
Cutting Speed: The distance that a point on
a cutter moves in one minute, expressed in
meters or feet per minute.
Dial Indicator: An instrument used in setup
and inspection work that shows on a dial the
amount of error in size or alignment of a part.
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
Gib: A tapered wedge located along a sliding
member to take up wear or to ensure a proper
G4003G Gunsmith's Lathe
Glossary of Terms
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
Leadscrew: The long screw that is driven by the
end gears and supplies power to the carriage.
Saddle: The upper portion of carriage that rides
on the lathe ways and supports the cross feed
and the follow rest.
Spindle: The revolving shaft that holds and
drives the workpiece.
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-
Tool Post: The part of the compound rest that
holds the tool holder.
Turret: A machine fixture that holds multiple tools
and can be revolved and indexed to position.
Ways: The precision machined and flat tracks on
which the carriage and tailstock slide.