Grizzly G0486/G0487 owner manual Oscillation Timing, To check the sanding belt oscillation

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 26, the emergency braking system will activate and stop the sander immediately.

Limit

Switches

Sanding Belt

Sander Outline

(Top View)

Figure 26. 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 30.

—If the belt tracks away from the air fork and air jet, triggering into the limit switch, con- tinue with Step 3.

G0486/G0487 Wide Belt Sander

3.An adequate stream of air through the air fork gap (Figure 27) 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 27. Oscillation components.
To set the correct amount of airflow through
the air fork gap:
1.	Remove the sanding belt then turn the belt
	tension knob to the tensioned position.
2.	Loosen the lock nut on the airflow adjustment
	knob (Figure 28).
3.	Turn the airflow adjustment knob (Figure 28)
	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.
	Lock Nut

Figure 28. Airflow adjustment knob.

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