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Using Fine Downfeed
Fine downfeed is used for precise Z-axis posi-
tioning of a cutter or end-mill when milling a flat
surface across the face of a workpiece. In order
to ensure the milled surface remains flat, the quill
lock lever should be locked after each adjustment
to ensure the spindle height cannot move until the
entire milling operation is complete.
To use fine downfeed:
1.
DISCONNECT MACHINE FROM POWER!
2.
Make sure spindle is completely stopped,
then pull downfeed selector knob out and
rotate it until it seats in manual (disengaged)
position (see Figure 40 on Page 38).
Note: It may be necessary to turn the spindle
by hand as you move the selector to enable
the gears to mesh.
3.
Set auto-downfeed direction pin (see Figure
39 on Page 37) in neutral (middle) position
to disengage fine downfeed handwheel from
auto-downfeed gears.
4.
Use coarse downfeed lever to lower spindle
slightly until you can pull fine/auto downfeed
clutch lever (see Figure 39 on Page 37) to
the left so it locks in place.
5.
Rotate fine downfeed handwheel to raise or
lower spindle.
Model G0796/G0797 (Mfd. Since 1/18)
Using Auto-Downfeed
When using the auto-downfeed system, the spin-
dle will move in the direction you choose with the
auto-downfeed direction pin. When the quill dog
reaches the top or meets the downfeed stop, the
downfeed clutch lever will release. Then, if the
spindle was traveling upward, the movement will
simply stop. If the spindle was traveling down-
ward, then the spindle will move back to the top
at a rate controlled by the return spring on the left
side of the head.
To use auto-downfeed:
Manual
1.
Make sure spindle is completely stopped.
(Disengaged)
Downfeed
Selector
2.
Pull downfeed selector knob out, then rotate
it clockwise until knob pin seats in auto-down-
feed (engaged) detent (see Figure 42).
Note: It may be necessary to turn the spindle
by hand as you move the selector to enable
the gears to mesh.
Manual
(Disengaged)
Downfeed
Selector
Figure 42. Downfeed selector in auto-downfeed
(engaged) position.
3.
Position downfeed stop for spindle depth that
is correct for your operation, then secure it in
place with locking wheel (see Figure 39 on
Page 37 and description on Page 37).
Auto-Downfeed
(Engaged)
Auto-Downfeed
(Engaged)
-39-
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