Spindle Downfeed - Grizzly G0796 Owner's Manual

Spindle Downfeed

Spindle downfeed movement on the mill is con-
trolled by three mechanisms: 1) The coarse
downfeed lever, 2) the fine downfeed handwheel,
and 3) the auto-downfeed system.
Downfeed Controls
Use Figure 39 and the following descriptions to
become familiar with the spindle downfeed con-
trols.
When spindle rotation is reversed, either
by changing the spindle speed range or by
using the spindle direction switch, the direc-
tion of spindle auto-downfeed will reverse.
A
B
C
D
E
Figure 39. Downfeed controls.
A. Auto-Downfeed Rate Selector. Selects one
of the three auto-downfeed rates:
0.0015 in/rev
0.003 in/rev
0.006 in/rev
B. Fine Downfeed Handwheel. Manually con-
trols slow spindle downfeed.
C. Auto-Downfeed Direction Pin. Starts, stops,
and reverses the auto-downfeed direction.
D. Fine Downfeed Clutch Lever. Engages the
fine/auto-downfeed gears.
Model G0796/G0797 (Mfd. Since 1/18)
K
J
I
F G H
E. Downfeed Scale. Used with the downfeed
stop and quill dog, shows the depth of spindle
downfeed in inches.
F. Downfeed Stop Locking Wheel. Tightens
against downfeed stop to lock it in place.
G. Downfeed Stop. Sets the depth of spindle
downfeed. The stop is threaded into position,
then the locking wheel is used to secure it in
place.
H. Quill Lock Lever. Secures the quill in place
for increased stability during operations.
I. Quill Dog. Moves with the quill and spindle.
When it contacts the downfeed stop in coarse
and auto downfeed modes, it disengages
the downfeed clutch and the spindle auto-
retracts.
J. Coarse Downfeed Lever. Manually controls
quick spindle downfeed.
K. Downfeed Selector. Sets the mill for manual
downfeed or auto-downfeed control.
Setting Downfeed Stop
The downfeed stop (see Figure 39) sets the depth
of spindle travel for repeat operations. The upper
edge of the downfeed stop aligns with marks on
the downfeed scale to help you set the approxi-
mate depth, however the downfeed scale func-
tions as a general guide only, and is not intended
for low-tolerance, precision results.
To set the downfeed stop, rotate stop until upper
edge aligns with desired depth indicated on
scale (see Figure 39), then tighten locking wheel
against stop to secure it.
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