Adjusting Pressure Rollers - Grizzly G0920 Owner's Manual

Adjusting
Pressure Rollers
Two spring-loaded pressure rollers help maintain
consistent pressure on the workpiece as it passes
the sanding drum. The pressure rollers have been
set correctly at the factory. DO NOT adjust the
pressure rollers unless absolutely necessary.
When properly positioned, the pressure rollers
should be approximately 0.004" lower than the
drum.
Adjusting the pressure rollers is a fine balance
between too much pressure and not enough. Too
much pressure can cause problems like snipe
or overloading the motor. Not enough pressure
may allow the workpiece to kick out of the sander
towards the operator.
Items Needed
Gauge Blocks (see Page 40) ............................ 2
Feeler Gauge Set .............................................. 1
Hex Wrench / ", 5mm ................................1 Ea.
5
32
To adjust pressure rollers:
1.
DISCONNECT MACHINE FROM POWER!
2.
Place gauge blocks on feed belt as shown in
Figure 66.
Figure 66. Example of gauge blocks placed
under drums.
-44-
3.
Lower drum until blocks just touch the rear
pressure roller.
4. Find largest size feeler gauge that can pass
between sanding drum and gauge block.
(Feeler gauge should slide with moderate
resistance, without forcing drum to roll.)
— If gap is 0.004" (0.1mm) or less, then no
adjustment of rear pressure roller is nec-
essary. Proceed to Step 5 to check front
pressure roller.
— If gap is more than 0.004" (0.1mm), then
rear pressure roller must be adjusted.
Proceed to Step 5 to check front pressure
roller before adjusting.
5. Lower drum until gauge blocks just touch
drum.
6. Find largest size feeler gauge that can pass
between front pressure roller and gauge
Qty
block. (Feeler gauge should slide with moder-
ate resistance, without forcing drum to roll.)
— If gap is 0.004" (0.1mm) or less, then
no adjustment of front pressure plate is
necessary. If rear pressure roller required
adjustment, proceed to Step 7, otherwise
pressure rollers should not be adjusted.
— If gap is more than 0.004" (0.1mm), then
front pressure plate must be adjusted.
Proceed to Step 7.
7.
Remove drum door lock knob shown in
Figure 67 to open drum door.
Figure 67. Location of drum door lock knob.
Drum Door
Lock Knob
Model G0920 (Mfd. Since 10/20)