5.If the drum does not contact the thickness gauge to the same degree as the opposite end of the drum, alignment is necessary.
To align the drum:
1.Loosen the four 3/8” hex cap screws – two front, two rear (A, Figure 22). This allows the entire drum carriage and shroud to be pivoted on two screws – one screw in front, one in back.
2.Lay the thickness gauge under the drum lengthwise. See Figure 23. Rotate the fine tune adjustment knob (B, Figure 22) until the drum contacts the gauge equally along its entire surface. Rotate the knob clockwise to raise the outboard end of the drum, counterclockwise to lower the outboard end of the drum. Use the height adjustment handwheel to raise or lower the entire drum.
3.When drum is parallel to conveyor, tighten the four screws (A, Figure 22).
Fine Tuning Drum Alignment
NOTE: This is an operational test. Perform this alignment after you have become familiar with sander operation.
When sanding boards wider than the drum, drum alignment is critical and must be adjusted exactly level to slightly higher 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 work piece.
1.Run a piece of scrap wood approximately 6” wide by 30” to 40” long through the sander sideways so that the end of the board extends past the end of the drum.
2.Without changing drum height, rotate the board 180° and sand the same side.
3.If a ridge is visible where the drum overlaps, loosen the four screws (A, Figure 22) and raise the outboard end of the drum by turning the fine tune adjustment knob (B, Figure 22) slightly clockwise.
Important: Only turn fine tune adjustment knob when all four screws (A, Figure 22) are loose.
4.Repeat this process until the ridge is eliminated and the entire board is sanded.
5.Tighten the four screws (A, Figure 23).
17
Figure 22
(conveyor table removed for clarity)
Figure 23