13
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 8‐4).
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 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)
Loosen both table locks
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).
8.6.1
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 level to slightly lower on the outboard end.
This will prevent any ridges from developing in the
stock. Always check this on a piece of scrap wood, as
follows, before sanding the work piece.
1.
Run a piece of scrap wood approximately
150mm wide by 700mm to 1000mm long
through the sander sideways so that end of
board extends past outboard side of drum.
2.
Without changing drum height, rotate board
180° and sand the same side.
3.
If a ridge is visible where the drum overlaps,
loosen both table locks (B, Figure 8‐4) and lower
table at outboard end slightly by turning knob
(C).
4.
Repeat this process until the ridge is eliminated
and entire board is sanded.
Note:
When sanding narrow stock (less than 560mm
for model JWDS‐2244, or less than 635mm for JWDS‐
2550), return conveyor table to parallel position. Turn
knob opposite direction until lock nut (D, Figure 8‐3)
is contacted. The lock nut provides a positive stop for
table parallelism.
8.7
Tension roller adjustment
The infeed and outfeed rollers are tensioned to
provide downward pressure on the workpiece to
prevent slippage on the feed conveyor. Tension
rollers have been set by the manufacturer, but should
be inspected and may require adjustment as the
sander receives use.
Improperly adjusted tension
rollers (i.e. those set too high, rendering them non‐
functional) could allow kickback of pieces being
sanded.
You can increase or decrease tension roller pressure
by turning the screws on the tension roller brackets
(Figure 8‐5).
Figure 8‐5: tension adjustment screws
Too much tension roller pressure can result in a
“snipe” mark, which is a visible line running across
the width of the board and located approximately
60mm from end of board.
If snipe occurs on the leading end of board, adjust
outfeed tension roller. If the snipe occurs on trailing
end of board, adjust infeed tension roller.
