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G0644 15" Open-End Wide Belt Sander
-25-
Sanding Belt
Oscillation Rate
To prevent sanding "streaks" in the workpiece,
the sanding belt oscillates from side-to-side on
the sanding drum during operation. This action
is caused by the twisting motion of the upper
sanding roller, and is automatically controlled by
a pneumatic piston and lever system inside the
sanding cabinet.
We recommend that one oscillation cycle (the
movement of the sanding belt from one side to the
other) should be 4–6 seconds.
Note: You will hear a metallic "thump" when the
sanding belt changes oscillation direction. This
noise is normal.
The rate of sanding belt oscillation can be
changed by adjusting the oscillation stops shown
in Figure 25
.
NOTICE
The sanding belt oscillation system requires
compressed air connected to the machine
and adjusted to 57 PSI. Without this com
-
pressed air, the sander will not operate.
To adjust the sanding belt oscillation rate:
1. DISCONNECT THE SANDER FROM
POWER!
2. Open the sanding belt access door and iden-
tify the oscillation stops shown in
Figure 25.
3. Use a 12mm wrench to loosen the oscillation
stop jam nuts, and adjust the oscillation stop
hex bolts equally in or out to change the oscil
-
lation rate.
Note: The farther in towards the center you
adjust the hex bolt, the slower the sanding
belt will oscillate for that direction of move
-
ment. Experiment to find the right oscillation
rate for your operation.
4. Re-tighten the jam nuts, and close the access
door.
5. Connect the machine to power, start the
sanding motor, and check the oscillation rate.
Repeat Steps 1–4 if necessary.
Figure 25. Sanding belt oscillation stops.
Jam Nut
Jam Nut
Hex Bolt
Hex Bolt
Stops
• When sanding workpieces with irregular
widths, take very light sanding passes to pre
-
vent gouges. As the width of the workpiece
decreases, the load on the sanding motor will
reduce and the sanding drum will speed up,
causing a gouge.
• DO NOT edge sand boards. This can cause
boards to kickback, and may result in serious
personal injury. Edge sanding boards also
can cause damage to the conveyor belt and
sandpaper.
• Feed the workpiece into the sander at an
angle to maximize stock removal and sand
-
paper effectiveness, but feed the workpiece
straight to reduce sandpaper grit scratches
for the finish passes.
• When sanding workpieces with a bow or
crown, place the high point up, which pre
-
vents the workpiece from rocking, and take
very light passes.
DO NOT sand more than one board at a time
side-by-side. Minor variations in thickness
can cause one board to be propelled at a
high speed of rate by the sanding belt and
could result in serious personal injury.