Grizzly G0781, Руководство пользователя, Страница: 24 / 52

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Model G0781 (Mfd. Since 2/15)
Using Spindle
Downfeed Controls
Figure 14. Location of headstock lock lever and
coarse downfeed handwheel.
Coarse
Downfeed
Handwheel
Headstock Lock
Lever
Headstock
Fine Downfeed
Handwheel
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
Using Coarse Downfeed
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.
The coarse downfeed handle and fine downfeed
handwheel (see
Figure 14) move the spindle up
and down for various milling/drilling operations.
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.
The fine downfeed handwheel allows for a pre-
cise amount of material to be removed from the
workpiece.