South Bend Tools
For Machines Mfd. Since 3/21
Model SB1119/SB1120
-27-
O P E R A T I O N
Changing
Spindle Speed
Figure
Figure 33. Location of RPM adjustment knob.
. Location of RPM adjustment knob.
RPM Adjustment
RPM Adjustment
Knob
Knob
The spindle speed on your shaper is controlled by
the RPM adjustment knob and displayed on the
digital readout screen (see Figure 33). Turning
the knob clockwise will increase the speed while
turning it counterclockwise will decrease the
speed.
Here are some tips to keep in mind when
selecting a speed for your workpiece:
• Use scrap stock to find the right cutter speed
and feed rate so the resulting cut is smooth
and requires very little sanding to finish.
• Reduce cutter speed or feed rate if your
workpiece becomes glazed or burned.
• Increase cutter speed or feed rate if your
workpiece shows a rough or washboard-like
surface.
•
Use slower speeds for larger cutters because
the knives on the outside of the cutter rotate
faster on larger cutters than on smaller
cutters for the same spindle speed (see
Figure 34).
Same Spindle Speed
Much
Faster
Slightly
Faster
Figure
Figure 34. Relative speeds of cutter knives at the
. Relative speeds of cutter knives at the
same spindle speed.
same spindle speed.
Note:
Since the cutter is mounted on the
spindle, the terms "spindle speed" and "cutter
speed" are often used interchangeably.
RPM Digital
RPM Digital
Readout Screen
Readout Screen