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Using Fine Downfeed
To engage the fine downfeed, turn the downfeed
selector knob clockwise until tightened. When fine
downfeed is engaged, the spindle only moves up
or down when the fine downfeed knob is rotated
(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 handwheel to adjust cutting tool
just above workpiece surface, then secure
headstock with Z-axis lock handle on left side
of column.
2.
Tighten downfeed selector knob
Figure 24) to engage fine downfeed knob.
3.
Loosen quill lock with hex wrench.
4.
Rotate fine downfeed knob clockwise and
lower cutting tool so it just touches workpiece.
5.
Move workpiece out of the way, using X/Y
table handwheels.
Model G0836 (Mfd. Since 09/17)
Downfeed
Selector Knob
(see
6.
Using Spindle Depth DRO to gauge spindle
movement, rotate fine downfeed knob clock-
wise until DRO displays 0.010" of movement.
7.
Tighten quill lock with hex wrench.
8.
Turn spindle speed dial ON, adjust speed as
appropriate, and perform milling operation by
moving workpiece under cutting tool with X/Y
table handwheels.
9.
Turn spindle speed dial OFF when milling
operation is complete.
Using Spindle Depth DRO
1.
Press OFF/ON button (see Figure 25). A
reading should appear on display.
Zero Button
in/mm
Button
OFF/ON
Button
Figure 25. Spindle depth DRO.
2.
Press in/mm button to select display incre-
ments of inches or millimeters.
3.
Press ZERO to "zero" readout at any point
along spindle travel. Current reading will be
cleared and scale will reset to 0.00.
4.
Press OFF/ON button when operation is
complete.
-25-
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