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Model G0704 (Mfg. Since 0 8/11)
-27-
Spindle Speed and
Direction
Setting the speed on the Model G0704 is a two
part process. The gearbox in the headstock has
two gear ranges and the motor is a variable speed
unit. Together, these two systems provide an
overall speed range of 50–2250 RPM.
When the dial is turned up all the way, the motor
draws the full amperage level. When combined
with a cutting load, the motor can overheat and
become damaged. If high speeds are needed, put
the speed range into high "H" then turn the vari-
able speed dial down, away from the maximum
position. If the maximum RPM is needed, reduce
the cutting load as much as possible and mini-
mize the operation time at these speeds.
To set the spindle speed:
1. Determine the appropriate spindle speed for
your operation. See Calculating Spindle
Speed on Page 26.
2. Select the appropriate speed range using
the speed range selector knob (Figure 25).
"H" represents the high speed range, which
is capable of spindle speeds from 100–2250
RPM. "L" represents the low range, which
is capable of spindle speeds from 50–1125
RPM.
Note: To maximize spindle torque, use the
low range.
Note: It may be necessary to rotate the
spindle by hand to get the gears to mesh
properly.
3. Make sure the work area is clear and that all
safety precautions are taken.
Figure 25. Speed selector knob.
Speed Selection
Knob
4. Turn the variable spindle speed knob to the
far left (slowest) position, then press the
green start button and use the spindle direc-
tion selection knob to choose the direction
of spindle travel and start spindle rotation
(Figure 26).
Figure 26. Spindle direction selection knob.
5. Watch the RPM readout and adjust the vari-
able spindle speed knob as needed until the
desired RPM is reached.
Spindle Direction
Selection Knob
RPM Readout
Variable Spindle
Speed Knob
NOTICE
AVOID OVERHEATING MOTOR!
DO NOT operate with variable speed dial at
full RPM for than a couple minutes or motor
overheating may occur. Instead, achieve the
same spindle speed by using the high “H”
speed range and reducing the motor RPM
by turning the variable speed dial down.