Oscillation Timing - Grizzly H2933 Instruction Manual

Oscillation Timing

NOTICE
The oscillation adjustments have been per-
formed at the factory and should require no
further attention. However, we recommend
verifying the settings.
When the oscillation is correctly adjusted, the
sanding belt oscillates to the left and to the right
at the same speed. If the sanding belt makes
contact with a limit switch, as shown in Figure 25,
the emergency braking system will activate and
stop the sander immediately.
Limit
Switches
Sander Outline
(Top View)
Figure 25. Improper oscillation.
To check the sanding belt oscillation:
1. Be sure the sanding belt is properly installed
and the belt tension knob and air supply are
ON.
2. Turn ON the sanding belt.
—If the belt oscillates without contacting the
limit switches, but the oscillation time to the
left and right are NOT equal, proceed to Step
5, on Page 33.
—If the belt tracks away from the air fork and
air jet, colliding into the limit switch, continue
with Step 3.
H2933/H2934/G0447/G0581 Wide Belt Sander
Sanding Belt
3.
An adequate stream of air through the air
fork gap (Figure 26) is essential for proper
oscillation. If the jet of air is weak through
the gap, the belt will track away from the
controller and into the limit switch on the
opposite end of the roller. The pivot action of
the upper roller, and the resulting oscillation
of the belt, are dependent upon adequate
airflow through the air fork gap.
Oscillation Controller Gap
Air Fork and Air Jet
Figure 26. Oscillation components.
To set the correct amount of airflow through
the air fork gap:
1.
Remove the sanding belt and turn the belt
tension knob to the tensioned position.
2.
Loosen the lock nut on the airflow adjustment
knob (Figure 27).
3. Turn the airflow adjustment knob (Figure 27)
clockwise until the airflow is completely OFF.
The upper roller should pivot to the right.
4.
Slowly turn the airflow adjustment knob
counterclockwise, and continue turning up
the air pressure until the roller pivots to the
left.
Figure 27. Airflow adjustment knob.
Lock Nut
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