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-10- G4002/3 Gear Head Lathes
To remove a chuck:
1. Place a piece of plywood across the lathe
bed and position it just under the chuck.
The board should be at least 8" wide and
10" long.
2. Turn a cam, with the chuck key, in the lathe
spindle in a counter-clockwise rotation until
the line on the cam is aligned with the line
going across the spindle housing as in
Figure 3.
Figure 3. Cam lines aligned to spindle line.
Never leave a chuck key in the chuck when
it is not in use. If the machine is acciden-
tally started with this in place, it can
become a projectile and cause serious
injury.
The chuck is heavy and can be awkward to
handle. Be aware that when removing or
installing a chuck a finger pinch situation
exists.
3. Turn the other cams in the same way. Make
sure to support the chuck with one hand as
you align the last cam. The chuck may
come off at this point so it is important you
are ready to support its weight.
4. Remove the chuck key.
If the chuck is still tight on the spindle:
Tap the back of the chuck with a rubber or wood-
en mallet while supporting the bottom of the
chuck with your free hand. If the chuck does not
immediately come off, rotate the spindle approxi-
mately 60˚ and tap again. Make sure all the
marks on the cams and spindle are in proper
alignment.
To install a chuck:
1. Place a piece of plywood across the lathe
bed and position it just under the spindle.
2. Lift the chuck up to the spindle and align
the pins in the back with the holes on the
spindle’s face and insert the pins.
3. While supporting the weight of the chuck,
turn one cam with the chuck key until the
cam line is between the two vees on the
spindle. Do not tighten at this time.
4. Rotate the spindle and repeat step 3 on the
last two cams.
5. Return to the first cam and snug it up.
Repeat with the rest of the cams.
6. Finally, tighten all three cams.