Belt Alignment
Belt alignment, like belt tension, is critical. Improper alignment of the motor pulley to the roll pulley(s) can result in reduced horsepower transfer, belt failure, and/or motor failure.
Figure 8. Misaligned pulleys vs. aligned pulleys.
There are two aspects of proper motor pulley alignment:
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The motor pulley must be positioned properly on the motor shaft. If the mill was ordered with a motor(s), the pulley alignment should be correct.
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The motor shaft must be parallel to the roll shaft, i.e., the motor should not be cocked. Using a straight edge, make sure the motor is not cocked due to belt tension. Place the straight edge flat against the face of the motor pulley, but so it just misses the roll pulley. Now raise or lower the straight edge at the roll pulley end and check to see whether the straight edge just touches the face of the roll pulley. Adjust the motor mount threaded rods accordingly.
Important:
For the final adjustment, the threaded rod furthest from the belts should not be pulling the motor; it must push the motor back toward the mill to overcome the belt tension’s tendency to “cock” the motor.
For more information on Belt Tension and Alignment in video form visit: https://www.rmsroller-grinder.com, under Links, then Industry Links