Delta 31-390, 31-392 instruction manual Adjusting Belt Tracking, Adjusting Pulley Alignment

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ADJUSTING BELT TRACKING

To check and adjust the tracking of the sanding belt on the pulleys, proceed as follows:

1.Raise the dust chutes (A) Fig. 34, at both ends of the top guard and dust chute assembly.

2.Make certain the top guard and dust chute assembly is not interfering with the rotation of the sanding belt.

3.Apply power to the machine. Jog the on/off switch several times and check to see if the sanding belt (B) Fig. 34, is tracking correctly on the pulleys, one of which is shown at (C). If an adjustment is necessary, turn the tracking knob (D) slightly right or left as needed until the belt is tracking properly. NOTE: The belt tracking adjustment can be made with the machine running however, make certain the surface of the sanding belt is freely moving and not in contact with any material or part of the machine.

ADJUSTING PULLEY ALIGNMENT

The idler pulley and motor pulley have been aligned and test run at the factory. However, rough handling during shipment or drive pulley wear may cause the sanding belt to run high or low at either the motor or idler end of the machine. The top edge of the sanding belt (A) Fig. 35, must be parallel to the top of the straight platen (B). If it is not parallel, adjust as follows:

1.CAUTION: DISCONNECT TOOL FROM POWER SOURCE.

2.NOTE: If the sanding belt (A) Fig. 35, is running LOW on the motor pulley, this means the top of the motor is too far away from the machine. The top of the motor must be moved toward the machine by loosening the two top INSIDE nuts, one of which is shown at (C), 1/2 turn and then tighten the two top outside nuts (D).

3.NOTE: If the sanding belt (A) Fig. 35, is running HIGH on the motor pulley, this means the top of the motor is too close to the machine. The top of the motor must be moved away from the machine by loosening the two top OUTSIDE nuts, one of which is shown at (D), 1/2 turn and then tighten the two top inside nuts (C).

4.Apply power to the machine. Jog the on/off switch several times and check to see if the top edge of the sanding belt (A) Fig. 35, is running parallel to the top of the straight platen (B). If further adjustment is necessary, repeat the procedure.

CAUTION: DO NOT BEND THE MOTOR MOUNTING PLATE (E) FIG. 35, WHEN MAKING THESE ADJUST- MENTS. If the motor misalignment is excessive, it may become necessary to move the bottom of the motor by adjusting the lower motor mounting nuts (F), in or out, in the same manner.

A

C

B

D

Fig. 34

B

A

C

D

E

F

Fig. 35

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Contents Edge Sander General Safety Rules Refer to them often Use them to instruct others Power Connections Unpacking and Cleaning Extension CordsAssembly Assembling Legs to Edge SanderAssembling Belt Tension Lever Disconnect Tool from Power Source Assembling Auxiliary END Table Assembly Disconnect Tool from Power SourceOperating Controls and Adjustments Adjusting Table PositionAdjusting Tilting Table Adjusting Short PlatenAdjusting Long Platen Adjusting Auxiliary END TableAdjusting Belt Tracking Adjusting Pulley AlignmentOperations Edge SandingContour Sanding around the Drive Pulley Contour Sanding around the Auxiliary Abrasive Drum SpindleMaintenance Changing Sanding BeltsChanging Abrasive Sleeves Changing Graphite PadsImportant Disconnect Tool from Power Source Changing Drum SpindlesCanadian PORTER-CABLE Delta Service Centers

31-392, 31-390 specifications

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