Using Spindle; Downfeed Controls - Grizzly G0781 Owner's Manual

Using Spindle

Downfeed Controls

The coarse downfeed handle and fine downfeed
handwheel (see Figure 14) move the spindle up
and down for various milling/drilling operations.
Fine Downfeed
Handwheel
Headstock
Figure 14. Location of headstock lock lever and
coarse downfeed handwheel.
The coarse downfeed handles are typically used
for drilling. Pull handles downward to lower the
spindle. Spindle travel is shown on the depth
scale and is limited by the depth stop limit block.
Fine downfeed is typically used for precise mill-
ing operations, because the headstock only
moves up or down in small increments when the
fine downfeed handwheel is rotated. The fine
downfeed handwheel graduated dial measures
spindle movement in 0.001" increments, with one
full revolution equaling 0.060" of spindle travel.
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Coarse
Downfeed
Handwheel
Headstock Lock
Lever
Using Coarse Downfeed
1.
Loosen headstock lock lever and pull out
on coarse downfeed handle to engage (see
Figure 14).
2.
Adjust limit block to set desired spindle dis-
tance from workpiece.
3.
Use coarse downfeed handles to raise and
lower headstock and spindle.
Using Fine Downfeed
The fine downfeed handwheel allows for a pre-
cise amount of material to be removed from the
workpiece.
In the following example, the fine downfeed
controls are used to mill 0.010" off a workpiece:
1.
Use course downfeed handle to adjust cut-
ting tool just above workpiece surface.
2.
Push course downfeed handle into handle
hub to engage fine downfeed handwheel.
Note: Spindle may need to be rotated by
hand to allow downfeed handle to align with
handle hub.
3.
Rotate fine downfeed handwheel clockwise
and lower cutting tool so it just touches
workpiece, then move workpiece out of the
way.
4.
Use graduated dial to gauge spindle move-
ment, rotate fine downfeed handwheel clock-
wise 0.010", then tighten headstock lock
lever.
5. Turn mill/drill ON and perform cutting pass.
Model G0781 (Mfd. Since 2/15)