Jet Tools Drum Sander - Manual (Page 18)

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NOTE: Keep track of how many revolutions of
the fine tune knob are needed to change drum
alignment for wider (over 22”) sanding. When
sanding narrow stock (less than 22”) loosen the
four screws (Figure 22) and turn fine tune
adjustment knob counterclockwise the same
amount as the initial wide sanding so that drum
is again parallel.
Tension Roller Alignment
The infeed and outfeed rollers are tensioned to
provide downward pressure on the workpiece to
prevent slippage on the feed conveyor. Tension
rollers are set at the factory, 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 kick-back
of pieces being sanded.
1. Unplug sander from power source and
remove abrasive (D, Figure 24) from drum.
2. Loosen all four hex nuts on the bearing bolts
(E, Figure 24). This will allow both tension
rollers to drop to their lowest position.
(NOTE: Figure 24 only shows outboard end
of drum. Adjustments must be made on both
ends of drum.)
3. Lower sanding drum to where it just
contacts the conveyor bed. Then raise the
sanding drum by making 3/4 turn of the
height adjustment handle.
4. Tighten the four hex nuts (E, Figure 24).
Both tension rollers are now positioned
about 1/16” below the bottom of the sanding
drum.
Tension Roller Pressure Adjustment
You can increase or decrease tension roller
pressure by turning the screws on the tension
roller brackets (Figure 25).
Too much tension roller pressure can result in a
“snipe” mark, which is identified as a visible line
running across the width of the board and
located approximately 2-1/4” from the end of the
board.
If the snipe occurs on the leading end of the
board, adjust the outfeed tension roller. If the
snipe occurs on the trailing end of the board,
adjust the infeed tension roller.
Tension roller pressure can also be adjusted by
raising the height of the rollers, as follows:
Figure 24
Figure 25