Determining Feed Speed; Changing Spindle Speed - Grizzly T30943 Owner's Manual

3. Lift breather valve (see Figure 13) at
top of coolant bottle so coolant will flow
smoothly.
4. When ready to begin drilling operation,
rotate coolant valve to ON position (see
Figure 13).
Breather
Valve
Coolant
Valve
Figure 13. Location of coolant system
components.
5. When operation is complete, retract bit
from workpiece, rotate coolant valve
to OFF position, press breather valve
down, and turn tool OFF.
Determining
Feed Speed
When feeding the bit into the workpiece,
apply only enough force to produce a
curled chip. Too little force will result in
small broken chips; too much force will
cause overheating of the bit, which can be
noticed when the bit and chips turn a blue/
brown color.
Keep feed pressure constant through-
out the operation to prevent chips and
burrs from falling under the cutting edges.
Cutting debris under the bit can make cut-
ting difficult or even impossible.
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Changing
Spindle Speed
The Model T30943/T30944 is equipped
with a variable-speed dial for quickly and
easily changing spindle speed.
As a general rule of thumb, the chips pro-
duced during cutting operations should be
a silver color. If the chips begin to turn a
blue/brown color, the spindle speed is too
high and should be reduced.
Achieving the correct speed will require
some trial and error, as the speed depends
on the size of the bit and the type of
workpiece material.
To change spindle speed:
1. Rotate spindle speed dial (see Figure
14) to approximate desired spindle
speed, then turn tool ON.
2. If necessary, adjust spindle speed dial
with tool running to further fine-tune
spindle speed.
Spindle
Speed Dial
Figure 14. Location of spindle speed dial.
Model T30943/T30944 (Mfd. Since 10/19)