Grizzly G4000 - Manual (Page 22)

G4000 9'' x 19'' Lathe -21-
F Fiig gu urre e 2 29 9.. Making a dead center.
1 10 0.. The finished diameter of the shoulder
should be .001'' larger than the diameter of
the recess in the chuck. This is a critical
step in minimizing chuck run-out.
1 11 1.. Install the chuck and check for runout.
If the runout is still excessive, the back of the
chuck will need to be resurfaced. To resurface
the back of the chuck:
1 1.. Using the 4-jaw chuck, mount a piece of bar
stock approximately
3 ⁄
4
'' in dia. protruding
about 2''. Turn about .015'' off the bar stock
so it is true to the lathe’s axis.
2 2.. Clamp the 3-jaw to the stock you have just
turned.
3 3.. Remove approximately .005'' from the mat-
ing surface on the back of the chuck.
4 4.. Install the 3-jaw chuck and check for
runout. Check with your dial indicator. If
excessive runout still exists, call our service
department for further instruction.
T Ta aiills stto oc ck k
The tailstock on the Model G4000 is aligned at
the factory with the headstock. You may want to
take the time to ensure that the tailstock is
aligned to your own desired tolerances. To align
the tailstock:
1 1.. Center drill a 6'' piece of bar stock on both
ends.
2 2.. Make a dead center by turning a shoulder
to make a shank. Flip the piece over in the
chuck and turn a 60° point.
F Fiig gu urre e 2 29 9.. As
long as it remains in the chuck, the point of
your center will be accurate to your spin-
dle’s axis. Keep in mind that the point will
have to be re-turned whenever it is
removed and returned to the chuck.