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.
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.
Figure 3. Cam lines aligned to spindle line.
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.
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.
G4002/3 Gear Head Lathes |