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W1772/W1773 37" Drum Sander
SERVICE
Pressure Roller Height
The pressure rollers are factory set at 0.039"–0.078" below
the bottom of the rear sanding drum and are fully adjust
-
able either up/down with the lock nuts shown in Figure
59
.
Proper pressure on the workpiece helps avoid kickback and
keeps the workpiece from slipping. However, as pressure
increases on the workpiece, snipe also increases (snipe is
normal with all brands of drum sanders).
If snipe becomes a problem, you can minimize it by reduc
-
ing pressure (raising pressure roller height). However, you
can only minimize it so much before the workpiece will slip
or kick out, causing a hazard to the operator. If this hap
-
pens, you have raised the pressure rollers too high for them
to function as intended—the pressure rollers MUST then be
lowered to prevent injury.
Note:
An additional trick for eliminating snipe is to reduce
pressure on the rear rollers, but not the front rollers.
Conditions will vary with wood types, so use trial-and-error
to find the best results for your application.
These instructions will restore the pressure rollers to the
factory setting.
To adjust the pressure rollers to the factory setting, do
these steps:
1. DISCONNECT POWER TO THE SANDER!
2. Open the top cover.
3. Place the gauge blocks on the conveyor table and
position them under all the pressure rollers, as shown
in Figure 60.
4. Adjust the conveyor table up so the gauge blocks just
touch the bottom of the rear drum.
5. Rotate the handwheel eight full turns clockwise,
counting from the point of actual table movement so
handwheel freeplay does not affect your count.
6. With all the pressure rollers: 1) Raise one end off of
the gauge block, then move it back down until it just
touches the gauge block; 2) repeat with the other
side; 3) tighten the lock nuts together to make sure
the adjustments are locked in place.
Figure 59. Pressure roller adjustment
nuts.
Figure 60. Gauge blocks in position for
adjusting the pressure roller height.