-30-
Model G9983 (Mfg. Since 8/09)
the first step in adjusting the oscillation is timing
the side to side movement the belt makes when
oscillating. the belt should take the same amount
of time to travel to one side as it did the other.
to time the oscillation movement:
1. open both access doors to the upper part of
the machine so you can view the belt move-
ment. the sanding belt should also be on the
rollers and tightened. turn the sanding belt
ON.
2. Count the amount of time it takes the belt to
move from one side to the other. if the oscilla-
tion balance is correct, the belt will move from
one side to the other in even intervals. if the
balance is not correct, the belt may move to
one side very quickly, then very slowly to the
other.
3. if the belt immediately moves too far and
shuts off the machine, then loosen the oscil-
lation timing control knob shown in
figure 26
and move it toward the front or rear of the
machine to rotate the eccentric.
oscillation timing
Keep your hands clear of the sanding belt
when making the adjustments during this
procedure. the sandpaper is designed to
remove a lot of material quickly whether it is
wood or skin!
Keep your hands clear of the sanding belt
when making the adjustments during this
procedure. the sandpaper is designed to
remove a lot of material quickly whether it is
wood or skin!
4. loosen the belt tension, rebalance the sand-
ing belt and retighten the belt tension. repeat
steps 2–3.
5. When you get the belt to oscillate without
stopping, experiment with the timing knob to
see the effect its movement has on the belt
oscillation.
6. position the timing knob so the belt moves
from one side to the other, back and forth, in
even intervals.
7. lock the knob in place by turning it clock-
wise.
figure 26. this is the oscillation
timing control knob.
use the valve shown in
figure 27 to control the
speed of the sanding belt oscillation. Make sure
the oscillation is balanced before adjusting the
speed.
oscillation speed
figure 27. use the knob on this valve to control
oscillation speed.
Knob
Содержание G9983
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