Jet 22-44 Pro-3, Operating Instructions And Parts Manual

Page: 19 / 40

19
Fine-Tuning Drum Alignment
The 22-44 Pro-3 is equipped with a drum adjuster
mechanism that allows easy fine tuning or
changing of drum alignment without repeating the
intial drum alignment procedure.
1. Raise drum adjustment lever (Figure 23) so
that it just engages the side of drum carriage
leg.
2. Slightly loosen bearing bolt knobs. (An internal
tooth lock washer is placed under the head of
each bearing bolt to prevent tension rollers
from dropping out of position if knobs are
loosened slightly. If tension rollers do drop,
simply raise to a position equal to that of the
inboard end of the drum and slightly tighten
knobs.)
3. With the bearing bolt knobs slightly loosened,
raise drum adjustment lever to raise the
outboard end of drum, or lower drum
adjustment lever to lower the outboard end of
drum.
4. After adjustment is made, re-tighten bearing
bolt knobs and check drum alignment.
The drum adjustment lever is useful when sanding
boards wider than the drum (see Figure 24). Here
the drum alignment is critical and must be adjusted
to exactly level to slighly high on the outboard end.
Test alignment with scrap wood approximately 6”
wide by 24” to 40” long. Run board through sander
sideways so that end of board extends beyond end
of drum. Rotate board 180° and sand the other
end. If a ridge is visible due to the drum overlap,
then raise outboard end of drum and test again
until ridge is eliminated.
Conveyor Belt Tension and Tracking
Tension and tracking adjustments may occasionally
be necessary during break-in and normal operation
to compensate for belt stretching.
Tension – To adjust the tension of the conveyor
belt, first adjust the take-up screw nut (Figure 25)
using the attached wrench. Do this on both sides of
the conveyor to obtain approximately equal tension
on both sides of the belt when taut. Insufficient belt
tension will cause slippage of conveyor belt on the
drive roller during sanding operation; the conveyor
belt is too loose if it can be stopped by hand
pressure applied directly to the top of the conveyor
belt. Excessive belt tension can result in bent
rollers, bent brackets, and/or premature wearing of
the bushings or belt.
Tracking – Belt tracking adjustments are made
while the conveyor belt is running. After the proper
belt tension is obtained (see above), turn the
conveyor on and set it at the fastest speed setting.
Watch for a tendency of the conveyor belt to drift to
one side of the conveyor. To adjust tracking, tight-
Figure 23
Figure 24
Figure 25
en the take-up screw nut on the side toward which
the belt is drifting, and loosen the take-up screw nut
on the opposite side an equal amount.
Adjusting the take-up screw nuts on either side of
the conveyor allows belt tracking adjustments to be
made without affecting belt tension.
Note: Adjust take-up screw nuts only 1/4 turn at a
time. Then allow time for the belt to react to the
adjustments before proceeding further. Try to avoid
over adjustments.