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Using Fine Downfeed
To engage the fine downfeed, turn the downfeed
selector handle clockwise until tightened. When
fine downfeed is engaged, the spindle only moves
up or down when the fine downfeed knob is rotat-
ed (there is no automatic spindle return to the top
position, as with the coarse downfeed controls).
This manual level of control makes it easy to pre-
cisely lock the spindle depth in place with the quill
lock lever when milling a flat surface across the
face of a workpiece, to ensure the spindle depth
does not move until the entire milling operation is
complete.
The fine downfeed knob allows for a precise
amount of material to be removed from the
workpiece (see Figure 24).
Fine Downfeed Knob
Spindle Depth
DRO
Figure 24. Fine downfeed controls.
In the following example, the fine downfeed
controls are used to mill 0.010" off a workpiece:
1.
Use Z-axis controls to adjust cutting tool just
above workpiece surface, then secure head-
stock with Z-axis lock handle on left side of
column.
2.
Tighten downfeed selector handle (see
Figure 24) to engage fine downfeed knob.
3.
Loosen quill lock with quill lock lever.
4.
Rotate fine downfeed knob clockwise and
lower cutting tool so it just touches workpiece.
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5.
6.
7.
8.
9.
Using Spindle Depth DRO
1.
Downfeed
Selector
Handle
2.
3.
4.
Move workpiece out of the way, using X/Y-
axis table handwheels.
Using spindle depth DRO to gauge spindle
movement, rotate fine downfeed knob clock-
wise until DRO displays 0.010" of movement.
Tighten quill lock with quill lock lever.
Turn spindle speed dial clockwise, adjust
speed as appropriate, and perform milling
operation by moving workpiece under cutting
tool with X/Y-axis table handwheels.
Turn spindle speed dial completely counter-
clockwise when milling operation is complete.
Press OFF/ON button (see Figure 25). A
reading should appear on display.
Zero Button
mm/inch
Button
OFF/ON
Button
Figure 25. Spindle depth DRO.
Press mm/inch button to select display incre-
ments of inches or millimeters.
Press ZERO to "zero" readout at any point
along spindle travel. Current reading will be
cleared and scale will reset to 0.00.
Press OFF/ON button when operation is
complete to conserve battery.
Model G0935 (Mfd. Since 04/21)
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