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Workshop Calculations
Arbor RPM
To calculate arbor RPM, enter the values from your machine in the boxes below:
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Motor Speed (RPM) Motor Pulley Dia. (in.)* Cutter Pulley Dia. (in.)*


Calculated Arbor RPM: 3,450

* Measure the outside diameters of pulleys.
Use Decimal Equivalents for Fractions:
Fraction Decimal Fraction Decimal Fraction Decimal Fraction Decimal
  1/16 0.0625   5/16 0.3125   9/16 0.5625  13/16 0.8125
  1/8 0.1250   1/3 0.3333   5/8 0.6250   5/6 0.8330
  1/6 0.1667   3/8 0.3750   2/3 0.6670   7/8 0.8750
  3/16 0.1875   7/16 0.4375  11/16 0.6875  15/16 0.9375
  1/4 0.2500   1/2 0.5000   3/4 0.7500 1      1.0000