Why are there two belt positions on the spindle motor?
• The spindle drive is infinitely variable in speed, but there are practical limits because an induction motor delivers very little power at low speed. The motor/spindle ratio needed for 4000 RPM would not be able to deliver any effective cutting power at 150 RPM. By offering two belt positions our spindle delivers good torque through a wide speed range. Changing belt positions is rarely needed because there is considerable overlap between the high speed and low speed positions. When a belt change is required, it takes less than a minute.
