14
8.5.1
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 workpiece.
1. Run a piece of scrap wood approximately 6”
wide by 30” to 40” 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 by slightly turning
knob (C) counterclockwise.
4. Repeat this process until the ridge is eliminated
and entire board is sanded.
5. Tighten table locks (B).
Note:
When sanding narrow stock (22” or less),
return conveyor table to parallel position. Turn knob
opposite direction until lock nut (D, Figure 8-4) is
contacted. The lock nut provides a positive stop for
table parallelism.
8.6
Tension roller adjustment
The infeed and outfeed rollers are intended 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 of roller on
outboard side by inserting screwdriver through
holes in plate (Figure 8-5) and turning screws on the
tension roller brackets. The plate can be removed
for easier access. The screws at inboard side of
drum can be adjusted in similar manner.
Too much tension roller pressure can result in a
“snipe” mark, which is a visible line located near the
end of the board and running across its width.
If snipe occurs on the leading end of board, adjust
outfeed tension roller. If snipe occurs on trailing end
of board, adjust infeed tension roller.
Figure 8-5: tension adjustment screws
9.0
Operations
Before using the drum sander, review the previous
sections on initial set-up and adjustment. Before
operating, make sure an abrasive strip is mounted
and a proper dust collection system is connected.
9.1
On/off switch (sanding drum)
To start drum, pull paddle switch upward; to stop
drum push switch down. This switch operates
sanding drum only; the conveyor is controlled
separately. See Figure 9-1.
To prevent unauthorized use of sander, push switch
OFF and pull out safety key (Figure 9-1). Store key
in a safe place. Key must be reinserted to start
sander.
NOTE:
Conveyor belt can still operate when
key is removed.
Figure 9-1: controls and safety key
9.2
Oscillation mode
The sander can be used with sanding drum in fixed
position or in oscillation mode. The top dial (Figure
9-1) activates oscillation mode.
NOTE: If changing from oscillation mode to fixed
mode, allow drum to center itself over conveyor
before turning off oscillation mode.
If a power outage occurs, all
functions currently active will restart when
power is restored. For safety, if an outage
occurs immediately shut off sander switch and
conveyor dial.
