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Home > Ordnance Documents and other related manuals > > Figure 15. Spring machine Collets.
(7) Collet Chuck
Figure 16. Jacobs Rubber -Flex Collets

Lathe Operations
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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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