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Model G0757Z (Mfd. Since 02/15)
Fine Downfeed
When fine downfeed is engaged the spindle only
moves up or down when the handwheel is rotated
(there is no automatic spindle return to the top
position, as with the coarse downfeed controls).
This level of control allows the spindle height to be
locked in place with quill lock when milling a flat
surface across the face of a workpiece. In order to
ensure the milled surface remains flat, the spindle
height cannot move until the entire milling opera-
tion is complete.
The graduated dial on the fine downfeed handle
measures spindle movement in 0.010" incre-
ments, with one full revolution equaling 0.100" of
spindle travel.
Using Fine Downfeed Controls
In the following example, the fine downfeed
controls are used to mill 0.010" off a workpiece:
1. Use Z-axis crank to adjust workpiece surface
just below cutting tool, then secure the head-
stock with Z-axis lock levers.
2. Tighten selection lever to engage fine
downfeed handwheel.
3. Loosen quill lock.
4. Rotate fine downfeed handwheel clockwise
and lower cutting tool so it just touches
workpiece.
5. Move workpiece out of the way.
6. Using graduated dial to gauge spindle move-
ment, rotate fine downfeed handwheel clock-
wise 0.010".
7. Tighten quill lock.
8. Turn mill ON and perform cutting pass.
Coarse Downfeed
When coarse downfeed is engaged, pull coarse
downfeed levers to lower the spindle. An internal
coil spring helps raise the spindle up when you
stop applying downward pressure on the lever.
Note: To maintain control of the upward spindle
travel and the rotating bit in your workpiece,
always continue holding the lever until the spindle
returns to the top position. Letting go of the coarse
downfeed levers when the spindle is in the low-
ered position will cause the spindle to retract too
quickly and slam up into the headstock or lift the
workpiece and cause it to spin out of control.
The coarse downfeed hub features a graduated
dial that measures spindle movement in 1" incre-
ments, with one full revolution equaling 5.00" of
spindle travel.