-38- Model G0747/G0748 (Mfg. Since 8/12)
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 the auto-downfeed:
1. Make sure the spindle is completely stopped.
2. pull the downfeed selector knob out, then
rotate it clockwise until the knob pin seats
in the auto-downfeed (engaged) detent (see
Figure 37).
Note: It may be necessary to turn the spindle
by hand as you move the selector to enable
the gears to mesh.
3. position the downfeed stop for the spindle
depth that is correct for your operation, then
secure it in place with the locking wheel.
Manual (Disengaged) Position
Auto-Downfeed (Engaged) Position
Figure 37. downfeed selector in auto-downfeed
(engaged) position.
4. position the auto-downfeed direction pin in
the center of the handwheel for the spindle
travel that is correct for your operation. if nec-
essary, rock the fine downfeed handwheel
back-and-forth to move the 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 the clutch lever is all the way to
the right in the disengaged position so that
the spindle will not travel when rotation is
started.
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.
6. set the mill for the correct spindle speed,
then begin spindle rotation.
To avoid damage to the system gearing,
never use the auto-downfeed system with
spindle speeds over 1750 RPM.