Wen 3960, Manual, Page: 10 / 18

10
ADJUSTMENTS
ADJUSTING BLADE TENSION
WARNING:
If the tension in the blade is too high, it runs the risk of breaking. If the tension is too low,
there is a risk of the blade slipping and stopping during a cut.
1. Raise the upper blade guide fully using the upper blade guide adjustment knob (Fig. I - 1).
2. Check the tension by pushing with a finger against the side of the blade halfway between the table and the upper
guide. The blade should not flex more than 2 mm.
3. Turn the tension knob (Fig. H - 1) clockwise to increase the blade tension or counterclockwise to decrease ten-
sion. Take the blade width into consideration during the adjustment.
UPPER BLADE GUIDE ADJUSTMENT
The height of the upper blade guard should be adjusted prior to every operation to accommodate the height of
the workpiece (the blade guard should be no more than one-eighth of an inch from the upper edge of the work-
piece).
1. Loosen the upper blade guide locking knob located on the back of the drill press (Fig. I - 2). Turn the adjust-
ment knob (Fig. I - 1) to adjust the height of the upper blade guide. Relock the upper blade guide locking knob to
secure the guard in place once the desired height has been reached.
2. Loosen the lower screw (Fig. I - 3) to adjust the guide bearings running along either side of the band saw blade.
The guide bearings should be positioned 1 to 2 mm from the teeth of the blade (Fig. K). Retighten the screw
afterward.
3. Loosen the upper screw (Fig. I - 4) and adjust the thrust bearing running along the back of the blade (Fig. K).
This bearing should be positioned 1/2 mm from the back of the blade. Retighten the screw afterward.
4. Loosen the socket head screw (Fig. J - 1) to adjust the guide bearings 1/4 mm away from the blade (Fig. L).
Retighten the socket head screw.
Fig. I
1
2
3
4
Fig. J
1