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The relationship between RPM (Revolutions Per Minute) and SFM (Surface Feet per Minute) can be calculated using the following formula:
\( \text{SFM} = \text{RPM} \times D \times \left(\frac{\pi}{12}\right) \)
- \( \text{RPM} \): Revolutions Per Minute (rotation speed).
- \( D \): Diameter of the workpiece (in inches).
- \( \text{SFM} \): Surface Feet per Minute (to be calculated).
If the RPM is 100 and the diameter of the workpiece is 2 inches:
\( \text{SFM} = 100 \times 2 \times \left(\frac{\pi}{12}\right) \approx 52.36 \, \text{ft/min} \)
This calculator helps determine the surface speed (SFM) of a rotating workpiece based on its RPM and diameter, useful in machining applications.
Yes, the calculator supports various units for rotation rate, including RPM, radians/second, degrees/second, and more. All inputs are converted to RPM for accurate calculations.
The calculator accepts diameter inputs in inches, centimeters, meters, feet, and yards, and automatically converts them to inches for the calculation. Results are provided in multiple units for convenience.
Entering zero for RPM or diameter will result in a zero SFM, as the formula multiplies these values. Please ensure inputs are greater than zero for meaningful results.
The results are displayed in multiple units (ft/min, m/min) to allow you to use the value in your preferred unit.