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4.
Position auto-downfeed direction pin (see
Figure 39 on Page 37) in center of handwheel
for spindle travel that is correct for your
operation. If necessary, rock fine downfeed
handwheel back-and-forth to move pin all the
way in or out.
Note: The direction pin has three positions:
1) In for one downfeed direction, 2) middle
for neutral or no movement, and 3) out for
the reverse direction. The direction of spindle
travel for the in and out positions is relative to
the direction of spindle rotation. Keep in mind
that spindle rotation and downfeed direction
will reverse when the spindle speed range is
changed.
5.
Make sure fine/auto downfeed clutch lever
is all the way to right in disengaged position
(see Figure 43) so that spindle will not travel
when rotation is started.
Fine/Auto Downfeed
(Engaged) Position
Figure 43. Fine/auto downfeed clutch lever
disengaged for auto-downfeed operations.
Note: We recommend that you complete
the remaining steps without a cutting tool
installed, without a workpiece in place, and
the table lower than the maximum spindle
downfeed travel. This will enable you to test
and confirm the settings before beginning the
actual cutting operation.
To avoid damage to system gearing, never
use auto-downfeed system with spindle
speeds over 1750 RPM.
-40-
Coarse Downfeed
(Disengaged) Position
6.
Set mill for correct spindle speed, then begin
spindle rotation.
ALWAYS start spindle rotation before using
auto-downfeed to avoid risk of gear damage.
7.
Select one of the three downfeed rates by
pulling knob of auto-downfeed rate selector
out, position selector over appropriate detent,
then release knob. Make sure pin is firmly
seated by attempting to move selector with-
out pulling knob out.
Note: Refer to the illustration in Figure 44
when selecting the downfeed rate.
Upper = 0.003 in./rev.
Middle = 0.0015 in./rev.
Lower = 0.006 in./rev.
(Rates given in inches of travel
per revolution of the spindle)
Figure 44. Positions of auto-downfeed rate
selector.
8.
Use coarse downfeed lever to lower spindle
slightly until you can pull clutch lever out to
the left and it locks in place, which will start
auto-downfeed spindle travel.
Model G0796/G0797 (Mfd. Since 1/18)
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