192 Module 17 • Centre lathe 17.1 Introduction
A centre lathe is a machine tool that produces a cutting action by rotating the workpiece against the cutting edge of the cutting tool. Te cutting tool can move diagonally across the bed or parallel to the lathe bed (sliding).
Te centre lathe enables the operator to execute a variety of processes on a workpiece by means of different actions which are carried out either by a cutting tool or other tool against the turning workpiece. Te purpose of this module is, amongst others, to hone your calculation skills in executing these processes. A modern centre lathe is shown in Figure 17.1.
chuck (3 jaw)
spindle speed change levers
end cover feed reverse lever
power button
emergency stop
headstock compound slide
tool post
splash guard
top slide dial tallstock lock tallstock
tallstock handwheel
lathe bed
saddle lead screw feed shaft
rack
Figure 17.1 A centre lathe 17.2 Mandrels
Mandrels are sometimes called lathe arbors and are used to hold workpieces that are turned between centres. A mandrel is a hardened and tempered shaſt used for holding workpieces that have already been bored and reamed to the correct size but need machining on other areas like gear cutting on the periphery.
Te mandrel is ground to a slight taper. Te workpiece is pressed onto the mandrel with a press. It can also be driven on with a soſt –faced hammer.
chip and collant tray
cross feed
apron longitudinal traverse
screw cutting dial/tread dial start stop lever screw cutting lever
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