Definition of Terms
Apron: The front part of the carriage assembly where the carriage hand- wheel is mounted.
Bed: Main supporting casting run- ning the length of the lathe
Between Centers: A dimension representing the maximum length of a workpiece that can be turned between centers. Also a method of holding a workpiece by mounting it between the centers of the headstock and the tailstock spindles.
Carriage: The assembly that moves the tool post and cutting tool along the ways.
Carriage Handwheel: A wheel with a handle used to move the carriage by hand.
Center: A precision ground tapered cylinder with a 60º pointed tip and a Morse Taper shaft. Used in the tailstock to support the end of long workpieces. May also be used in the headstock spindle to support work between centers at both ends.
Center Drill: A short drill used to form pilot holes and countersunk holes.
Centerline: An imaginary line ex- tending from the center of the spindle through the center of the tailstock ram, representing the central axis of the lathe around which the work rotates.
Chuck: A clamping device for hold- ing work in the lathe or for holding drills in the tailstock.
Compound: Movable platform where the tool post is mounted; it can be set at an angle to the workpiece (also known as compound slide and compound rest).
Compound Handwheel: The wheel used to move the compound slide in and out.
Cross Slide: Platform that moves along the lathe axis under control of the
Cross Slide Handwheel: The wheel used to move the cross slide in and out (also called cross feed).
Faceplate: A metal plate with a flat
Facing: A lathe operation in which metal is removed from the end of a workpiece to create a smooth sur- face.
Gib: An adjustable length of steel or brass with a diamond shaped cross- section that engages one side of the dovetail slide. Used to adjust the dovetail for optimum tightness and to compensate for wear.
Halfnut: A nut formed from two halves which clamp around the lead- screw to move the carriage.
Halfnut Lever: This Lever engages the carriage with the leadscrew.
Headstock: The main casting mounted on the left end of the bed where the spindle is mounted. Hous- es the spindle gears.
Leadscrew: Screw used to drive the carriage under power for turning and thread cutting operations. Smaller
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