Grizzly VS MILLING MACHINE G0669X - Manual (Page 32)

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g0669X precision 10" x 54" Vs Milling Machine
2. Measure the diameter of your cutting tool in
inches.
3. Use the following formula to calculate the
required rpM for your operation:
Selecting Spindle Speed Range
1. Make sure the spindle motor is turned OFF,
and the spindle is stopped.
2. select the range in the chart below that
includes the spindle speed that you have cal-
culated for your workpiece.
Range RPM
Low range 75–520
high range 520–4200
figure 36. spindle speed ranges.
NOTICE
to avoid damage to the drive system, make
sure the spindle motor is turned OFF and
the spindle is stopped bEfORE you change
the spindle speed range.
3. press the selector handle in toward the
head to retract the locking pin and move it.
Make sure the locking pin is seated in the
indent for the position you have chosen (see
figure 37).
figure 37. spindle speed range selector in the
high position.
Note: As you move the selector, it may be
necessary to rotate the spindle by hand to jog
and mesh the gearing.
Setting Spindle Variable Speed
1. With the spindle in motion, rotate the spindle
speed dial on the control panel until the
spindle has reached the desired speed as
indicated by the spindle speed readout.
Note: The top numbers of the spindle speed
readout are for the high speed range, and
the bottom numbers are for the low speed
range.
NOTICE
Always have the spindle in motion bEfORE
using the spindle speed dial to avoid dam-
age to the variable speed system.