Jet Tools 22-44 Pro - Manual (Page 19)

19
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
30). 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
31) 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, tighten 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.
Figure 30
Figure 31