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There are a number of devices that are used
with fine and power downfeed control. Familiarize
yourself with these controls, as described below
and shown in Figure 39.
C
A
B
H
Figure 39. Fine and power downfeed controls.
A. Power Downfeed Rate Dial: Selects one of
three power downfeed rates.
B. Fine Downfeed Handwheel: Manually con-
trols the fine downfeed of the spindle.
C. Power Downfeed Direction Pin: Moves the
spindle up or down in power downfeed mode.
Moving this pin fully in or out reverses the
direction of the downfeed. The center posi-
tion is neutral and downfeed will stop.
D. Quill Dog: Moves with the quill and is used
with the downfeed stop.
E. Downfeed Stop: Adjusts to a selected depth
for the cutting operation. Each rotation of the
stop moves it one millimeter, and it is marked
in 0.001". The scale to the left of the stop is
in inches.
F.
Quill Locking Lever: Locks the quill in
place.
G. Downfeed Stop Locking Thumb Wheel:
Locks the downfeed stop in place.
H. Downfeed Clutch Lever: Engages the fine/
power downfeed gear.
-36-
D
E
F
G
Fine Downfeed Handwheel
1.
Turn the mill OFF, wait for the spindle to stop,
and loosen the quill locking lever.
2.
Pull the knob of the manual/power downfeed
selector out and move it to the left-hand
manual or "hand" position (see Figure 37).
3.
Disengage the coarse downfeed handle hub
from the mill.
4.
Place the fine downfeed handwheel on the
axle, and insert the handwheel hub pin into a
hole on the base (see Figure 39).
5.
To move the spindle with fine control, pull the
downfeed clutch lever to the left and rotate
the fine downfeed handwheel.
Note: The downfeed clutch will stay engaged
until either you push the lever to the right, or
the quill dog engages the downfeed stop.
Power Downfeed System
1.
Turn the mill OFF and wait for the spindle to
stop.
2.
Pull the knob of the manual/power downfeed
selector out and move it to the right-hand
"power" position.
4.
Loosen the quill locking lever.
5.
Adjust the downfeed stop to the desired
depth of cut.
6.
Turn the mill ON.
When changing the spindle speed range, the
spindle direction will reverse. Always know
which way the spindle is spinning before
moving the cutting tool into the workpiece.
Model G9901/G9902/G9903 Milling Machine
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