Use and Care Manual

13
8.4 Conveyor belt tension/tracking
Conveyor belt tension adjustment may be
necessary during the break-in period to compensate
for belt stretching.
8.4.1 Belt tension adjustment
1. Adjust take-up screw (Figure 8-3) with 5mm hex
wrench. Do this on both sides of conveyor to
obtain approximately equal tension on both
sides of conveyor belt when taut.
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.
Figure 8-3: conveyor belt take-up screw
8.4.2 Belt 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 sect. 8.4.1).
2. Turn on conveyor and set to maximum speed.
Watch for tendency of conveyor belt to drift to
one side of conveyor. If it drifts, tighten take-up
screw on the side toward which it is drifting
(Figure 8-3).
Note: Adjust take-up screw only 1/4 turn at a time.
Allow time for belt to react to adjustments before
proceeding further.
Avoid over-adjusting, as this may affect belt tension.
If tension is affected, it may become necessary to
use both take-up screws to accomplish tensioning
and tracking.
8.4.3 Trackers
The sander is equipped with “Trackers”, ceramic
guides that reduce the amount of adjustments
needed to keep conveyor belt tracked (centered) on
conveyor table. These guides have a magnetic
backing to keep them in place. If a Tracker wears
through, it can be reversed by turning it over. See
sect. 11.0 Tracker Kit for more information about re-
setting trackers.
8.5 Inspecting drum alignment
The sanding drum must be parallel to conveyor table
for proper machine operation. The sanding drum
comes pre-aligned from the manufacturer. If a
problem with drum alignment should occur, follow
the instructions below.
First, inspect the alignment with a gauge of some
kind. The following procedure uses a steel straight-
edge as a gauge.
1. Unplug sander from power source.
2. Open dust cover and remove abrasive strip
from drum.
3. Insert gauge (A, Figure 8-4) between drum and
conveyor table at outboard side.
Figure 8-4: drum alignment
4. With dust cover open, lower sanding drum while
slowly rotating drum by hand, until drum lightly
contacts gauge. NOTE: Make sure drum, not
just the tension rollers, contacts the gauge.
Make a note of the measurement on the
sander’s depth scale.
5. Remove gauge and place under drum at
inboard side.
6. If drum does not contact gauge equally on both
ends of drum, alignment is needed.
To align conveyor table with drum:
7. Loosen both table locks (B, Figure 8-4)
Loosen both table locks
before adjusting drum alignment. Failure to
comply may cause damage to table.
8. Turn knob (C) to raise or lower outboard end of
table. Follow directional marks on label: (+) to
raise, (-) to lower.
9. Tighten table locks (B).