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Pulley Speed Calculator

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Many rotary tools allow the user to set the spindle speed by changing the ratio of pulleys. The main shaft turns at the rate of the motor, and then a pulley system steps up or down that speed to the spindle. This calculator computes the best pulleys slots to use a desired RPM. The default values are for a Tiag milling machine. Enter in the pulley diameters for the motor shaft and the spindle shafts



Motor Speed (RPM)
Desired Spindle Speed (RPM)
Motor (A) Spindle (B)

Actual Spindle Speed (RPM)
Error (%)

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