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For Machines Mfg. Since 8/09 Model SB1027
-37-
OPERATION
Fine Downfeed Controls
There are a number of devices on the head that
are used with the fine downfeed handwheel or
the auto-downfeed system. Refer to Figure 39
and the descriptions below to become familiar
with these controls.
A. Auto-Downfeed Rate Selector: Selects one of
the three auto-downfeed rates.
B. Fine Downfeed Handwheel: Manually
controls fine 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.
E. Downfeed Scale: Used with the quill dog,
shows the depth of spindle downfeed in
inches.
F. Quill Lock Lever: Secures the quill in place
for increased stability during operations.
When the spindle rotation is reversed,
either by changing the spindle speed range
or by using the spindle direction switch,
the direction of spindle auto-downfeed will
reverse.
G. Downfeed Stop & Locking Wheel: 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 Dog: Moves with the quill and spindle
and disengages the downfeed clutch lever
when it meets either the top or downfeed
stop.
I. Downfeed Selector: Sets the mill for manual
downfeed or auto-downfeed control.
Using the Fine Downfeed
Handwheel
1. Make sure that the spindle rotation is turned
OFF and the spindle is at a complete stop.
2. To set the downfeed for manual control, pull
the downfeed selector knob out, then rotate
the selector clockwise until the selector pin
seats in the forward manual (disengaged)
position.
3. Set the auto-downfeed direction pin in the
neutral (middle) position to disengage the
fine downfeed handwheel from the auto-
downfeed gears.
4. Position the downfeed stop for the spindle
depth that is correct for your operation, then
secure it in place with the locking wheel.
5. Use the coarse downfeed lever to slightly
lower the spindle until you can pull the
clutch lever out to the left and it locks in
place. This will engage the fine handwheel
with the quill and spindle.
6. To lower the spindle, rotate the fine
downfeed handwheel. When the quill dog
meets the downfeed stop, the clutch lever
will disengage and the spindle will return to
the top.
Figure 39. Fine downfeed controls.
A
B
C
D
I
H
G
F
E