Inspecting Drum Alignment - Jet JWDS-1632-M Mode D'emploi

2. Adjust take-up screw nuts (Figure 8-2) with 5mm
hex wrench. Do this on both sides of conveyor to
obtain approximately equal tension on both sides
of sanding 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 8-2: belt tension adjustment
8.3.2 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. Unplug sander from power source.
2. Make sure proper belt tension has been achieved
(see sect. 8.3.1).
3. 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 or loosen
take-up screw.
Note: Adjust take-up screw only 1/4 turn at a
time. 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 use both take-up screws to
accomplish tensioning and tracking.
8.3.3 Trackers
The sander comes 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.

8.4 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 between drum and conveyor table at
outboard side of drum (A, Figure 8-3).
Figure 8-3: 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 contacts
gauge, not just the tension rollers.
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 locking screws (B, Figure 8-3)
before adjusting drum alignment.
8. Turn knob (C) to raise or lower outboard end of
table. Follow directional marks on label (+ raises,
- lowers).
9. Retighten table lock screws (B).
8.4.1 Fine-tuning drum alignment
Note: This is an operational test for sanding boards
wider than the drum. Perform this procedure only
after you have become familiar with sander operation.
When sanding boards wider than the drum, table
alignment is critical and table must be adjusted exactly
12
Loosen both table locks