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Copyright © 2021 Quality Machine Tools, LLC
PM-1340GT v8 2021-04
Figure 3-26
Installing a Camlock chuck
Figure 3-25
Protect the lathe bed
Figure 3-27
Cam in locked condition
TO REMOVE A CHUCK
Disconnect the 220-240V supply from the lathe!
Protect the lathe bed, as Figure 3-25. While supporting
the chuck's weight, turn each of the cams to 12 o’clock,
Figure 3-26, then remove the chuck. If the chuck does
not come free, try tapping the backplate gently with a
soft (dead blow) mallet.
2.
Turn the spindle by hand, checking that all three cam
markers are at 12 o’clock.
3. While
supporting its full weight
, install the chuck
without tilting, see Figure 3-26, then gently turn each
of the cams
clockwise
— snug, firm, but not locked
in this first pass.
4.
Check that each of the cam markers lies between 3
and 6 o’clock, between the two Vees stamped on the
spindle, Figure 3-27.
5.
If any cam marker is
not
within the Vees, first be sure
that there is
no gap
between chuck backplate and
spindle flange. Also, remove the chuck to inspect the
studs — burrs can be a problem, hone if necessary.
If there are no visible problems, the stud in ques-
tion may need adjustment as follows:
• Remove the stop screw from the stud.
•
If the cam marker in question can’t get to the first
Vee (3 o’clock), back the stud
OUT
one full turn, then
replace the stop screw.
•
If the cam marker goes beyond the second Vee (6
o’clock), screw the stud
IN
one more turn, then re-
place the stop screw.
•
If the markers are correctly aligned, repeat the tight
-
ening sequence as step 3, light force. Repeat the
sequence two more times, first with moderate force,
then fully tighten.
