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# Calculation Surface Speeds from wheel dimensions and RPM

BRITISH UNITS

#### Wheel Diameter =

 Grinding Wheel Speed Calculator - British Units CALCULATING SFPM The performance of grinding wheels and quality of the finished workpiece is affected by how fast the abrasive grains sweep over the workpiece. That speed affects surface quality, workpiece burn, material removal rates, and other factors. Since the speed of the abrasives on the wheel perimeter depends upon the diameter of the wheel, RPM isn't a useful measure. To calculate the speed, consider that abrasive grains on the wheel perimeter traverse the circumference of the wheel once for every revolution of the wheel. So their speed is equal to the circumference (in feet) times the number revolutions per minute(RPM). Also important is pi,a constant ratio between diameter and circumference of a circle. In the boxes on the left enter two values to calculate a third value. One of the three boxes must be blank. Wheel diameter is measured in inches for US/English Units and in mm for Metric.

METRIC UNITS

#### Wheel Diameter =

 Grinding Wheel SpeedCalculator - Metric Units Enter in metric units. Millimeters (mm) for wheel diameter,Meters per second (MPS) for surface speed.