Revolutions Per Minute-RPM (How quickly something turns)
Most electric motors have a fixed rotational speed. They are either on or off. Unlike a car, you don’t usually have an accelerator lever to vary the speed of the motor. For the best cutting performance of different materials, cabinetmakers sometimes need to change the rotational speed of the cutter. To do that the machine may allow for a change in gearing.
Gear Ratios:
The formula for calculating the change in rotational speed (RPM) is:
RPM of the motor X diameter of the motor pulley (drive gear) = RPM of the cutter
diameter of the driven pulley (driven gear)
Notice that if the two diameters are the same, the RPM does not change. The gear ratio is 1:1 (any number divided by the same number is one)
Exercise 1: Motor RPM Exercise Complete the table
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