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Copyright © 2020 Quality Machine Tools, LLC
PM-1440GT v9 2020-10
Figure 3-7
Installing a Camlock chuck
Figure 3-8A Figure 3-8B
Both examples above show
Cam in locked condition
THE SPINDLE MARKINGS ON YOUR LATHE MAY
VARY AS SHOWN ABOVE - Please match to your
spindle marking type. Cam Marker at 12 o'clock is
always unlocked. Cam Marker between 3 and 6 o'clock
is always locked - 3 to 6 o'clock is the only position
when the spindle may be rotated under power
TO REMOVE A CHUCK OR FACEPLATE
First, disconnect the power supply from the lathe!
Protect the lathe bed, as Figure 3-6. While supporting its
weight, turn each of the cams to 12 o’clock, Figure 3-7, then
remove the chuck. If the chuck does not come free, try tapping
the backplate gently with a soft (dead blow) mallet.
CROSS-SLIDE & COMPOUND
The cross-slide and compound have 10 TPI leadscrews, with
100-division graduated collars, Figure 3-9. Each division rep-
resents a “true” motion of 0.001”. On the cross-slide dial, only,
this shows as 0.002” per division, meaning that a 0.001” depth
of cut reduces the diameter of the workpiece by 0.002”.
The collars also have 127-division metric graduations, display-
ing "true metric" motion of 0.02 mm per division on the com-
pound, 0.04 mm on the cross-slide.
dition to disengage the gear train.)
2. Turn the spindle by hand, checking that all six cam markers
are at 12 o’clock, Figure 3-7.
3. While
supporting its full weight
, install the chuck with-
out tilting, then gently turn each of the cams
clockwise
—
Figure 3-6
Protect the lathe bed
snug, firm, but not locked in this first pass.
4. Check that each of the cam markers lies between 3 and 6
o’clock, Figure 3-8.
5.
If you are satisfied that all six cam markers are correctly
positioned, repeat the tightening sequence, Step 3, first
with moderate force, then fully tighten.
If any cam marker is
not
past the 3 o'clock position, first be
sure that there is
no gap
between chuck backplate and spin-
dle 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 question may need adjustment:
• Remove the stop screw from the stud.
• If the cam marker in question can’t get to 3 o’clock, back
the stud
OUT
one full turn, then replace the stop screw.
• If the cam marker goes beyond 6 o’clock, screw the stud
IN
one more turn, then replace the stop screw.
• If the markers are correctly aligned, repeat the tightening
sequence as step 3, light force.
Figure 3-9
Cross-slide and compound dials
THE SPINDLE MARKINGS ON YOUR LATHE MAY
NOT BE AS SHOWN HERE — see figure 3-8A/B
