Spindle Bearing Break-In; Recommended Adjustments - Grizzly G0726 Owner's Manual

Spindle Bearing
Break-In
Failure to complete the spindle break-in
process may lead to premature failure of the
bearings—this will not be covered under
warranty.
Before operational loads are placed on the spin-
dle bearings, complete this break-in procedure to
fully distribute internal lubrication and reduce the
risk of early failure.
To perform the spindle break-in procedure:
1. After successfully completing the Test Run
procedure, make sure the spindle switch is in
the OFF position and the spindle has come to
a complete stop.
2. Move the spindle speed range selector to the
LOW position (refer to Adjusting Spindle
Speed on Page 35 for detailed instructions).
Do not leave the mill unattended during the
Spindle Break-In procedure. If your atten-
tion is needed elsewhere during this proce-
dure, stop the mill and restart the procedure
later from the beginning.
3. Turn the spindle switch to the forward posi-
tion, press the start button, then use the vari-
able speed handwheel to adjust the spindle
speed to approximately 300 RPM.
4. Let the mill run at this speed for 20 minutes,
then turn the spindle switch to the OFF posi-
tion and allow the spindle to come to a com-
plete stop.
5. Turn the spindle switch to the reverse (REV)
position, press the start button, then let the
mill run for another 20 minutes in reverse.
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6. Turn the spindle switch to OFF position, wait
for the spindle to come to a complete stop,
then move the spindle speed range selector
to the HIGH position and start forward spindle
rotation.
7.
Set the spindle speed at approximately 2150
RPM, then repeat Steps 4–5.
8.
Stop spindle rotation. The spindle break-in is
now complete and the machine is ready for
operation.
Recommended
Adjustments
For your convenience, the adjustments listed
below have been performed at the factory.
However, because of the many variables involved
with shipping, we recommend that you at least
verify the following adjustments to ensure the best
possible results from your new machine.
Factory adjustments that should be verified:
1. Gib adjustment (Page 52).
2. Leadscrew backlash adjustment (Page 53).
Model G0726 (Mfg. Since 7/11)