LATHE OPERATIONS - OD1645 - LESSON 1/TASK 1
handwheel or hand lever to move the draw bar. The collet is fitted to the
right end of the headstock spindle.
The draw bar passes through the
headstock spindle and is threaded to the spring machine collet.
When the
draw bar is rotated by means of the handwheel, the collet is pulled inward
and the collet walls are cammed together by contact with the collet sleeve,
tightening the chuck to the workpiece.
FIGURE 15.
SPRING MACHINE COLLETS.
(d) Collet chucks are usually standard equipment on toolroom-type engine
lathes and on horizontal turret lathes.
Spring machine collets are
available in different shapes in order to chuck square and hexagonal
workpieces of small dimensions as well as round workpieces.
(8) Jacobs Rubber-Flex Collets. The rubber flex collet (figure 16 on the
following page) is comprised of hardened alloy steel jaws bonded together
with oil-resistant Hycar synthetic rubber. The collets have a range of 1/8
inch per collet and the gripping power and accuracy remain constant
throughout the entire collet capacity. These
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