Adjustments; Depth Scale; Conveyor Belt Tension/Tracking - Powermatic PM2244 Operating Instructions Manual

7.0 Adjustments

Disconnect sander from power
source before making adjustments.

7.1 Depth scale

The depth scale indicates distance between bottom
of sanding drum and top of conveyor belt.
Adjustment is performed by "zeroing" the scale.
1. With an abrasive strip on the drum, lower
sanding drum to where it touches top of
conveyor belt.
2. At this drum position, the depth scale pointer
should align with zero mark on scale. If it does
not, loosen screw (Figure 9) and raise or lower
pointer to align with zero on scale.
3. Retighten screw.
Note: Depending on desired accuracy, you may
need to repeat this process when installing
different abrasive grits.
This calibration of depth gauge establishes
"absolute" distance from conveyor belt to drum,
while the control panel allows setting of zero point
for relative distance.
Figure 9

7.2 Conveyor belt tension/tracking

Conveyor belt tension adjustment may be
necessary during the
compensate for belt stretching.
7.2.1 Tension adjustment
1. Remove left side cover (Figure 10) by removing
two socket head screws with 4mm hex wrench.
Figure 10
break-in period to
Adjust take-up screw nuts (Figure 11) with a
2.
17mm wrench. Do this on both sides of
conveyor to obtain approximately equal tension
on both sides of sanding belt.
NOTE: Insufficient belt tension will cause
slippage of conveyor belt on drive roller during
sanding operation. The conveyor belt is too
loose if it can be stopped by hand pressure
applied directly to top of moving conveyor belt.
Excessive belt tension can result in bent rollers,
bent brackets, and/or premature wearing of
bushings or conveyor belt.
3. Reinstall left side cover when tensioning is
complete.
7.2.2 Tracking adjustment
A belt tracks correctly when it moves centrally on
the conveyor rollers without drifting to either side.
Tracking adjustments are made while conveyor belt
is running.
1. Make sure proper belt tension has been
achieved (see 7.2.1 Tension adjustment).
2. Turn on conveyor and set to maximum speed.
Watch for a tendency of conveyor belt to drift
to one side of conveyor. If it drifts, tighten or
loosen take-up screw nut on right side of
conveyor (Figure 11).
Note: Adjust take-up screw nut only 1/4 turn at
a time. Then allow time for belt to react to
adjustments before proceeding further.
Try to avoid over adjustments, as this may
affect belt tension. If tension is affected, if may
become necessary to remove left side cover
and use both take-up screw nuts to accomplish
tensioning and tracking.
7.2.3 Trackers
The sander comes equipped with "Trackers",
ceramic guides that reduce the amount of
adjustments needed to keep the conveyor belt
tracked (centered) on the conveyor bed. See Figure
12. These guides have a magnetic backing to keep
them in place. If a Tracker wears through, it can be
10
Figure 11