Using Spindle Downfeed Controls - Grizzly G0827 Owner's Manual

Using Spindle
Downfeed Controls
Use Figure 50 and the descriptions below to
understand the downfeed components that con-
trol the spindle downfeed travel.
Fine
Downfeed
Handwheel
Quill
Lock
Figure 50. Spindle downfeed controls.
Coarse Downfeed Levers: Allow you to manu-
ally control downfeed travel of spindle in a rapid
manner. The spindle automatically returns to the
top position when pressure is released from the
handle, making this ideal for drilling operations.
Fine Downfeed Handwheel: Manually controls
downfeed travel in a slow, precise manner. Unlike
coarse downfeed, the spindle does not automati-
cally retract, which makes this ideal for fine posi-
tioning of the spindle/cutter for miling operations.
The attached graduated dial has increments of
0.001" with one full revolution representing 0.100"
of travel.
Selection Lever: When tightened, enables the
fine downfeed handwheel; conversely, when loos-
ened enables the coarse downfeed levers.
Quill Lock: Secures the quill in place for increased
stability during milling operations. Typically only
used after first positioning spindle/cutter with fine
downfeed handwheel.
-38-
Coarse Downfeed
When the coarse downfeed is engaged, pull the
coarse downfeed levers down to lower the spin-
dle. An internal coil spring helps raise the spindle
up when you stop applying downward pressure
on the lever.
Note: To maintain control of the upward spindle
travel and the rotating bit in your workpiece,
always continue holding the lever until the spindle
returns to the top position. Letting go of the coarse
Coarse
downfeed levers when the spindle is in the low-
Downfeed
ered position will cause the spindle to retract too
Lever
quickly and slam up into the headstock or lift the
workpiece and cause it to spin out of control.
Selection
Lever
The coarse downfeed hub features a graduated
dial that measures spindle movement in 1" incre-
ments, with one full revolution equaling 5" of
spindle travel. The dial has a thumbscrew that is
used to adjust the dial to "0".
Model G0827 (Mfd. Since 11/17)