## PFERD Rotational speed calculator

Calculate the ideal rotational speed, tool diameter or cutting speed.

### Calculate the ideal rotational speed (n)

The drive rotational speed (n) is given in revolutions per minute [rpm]. The required rotational speed is determined from the cutting speed V in feet per minute [fpm] or in feet per second [fps] and the diameter of the tool d x π (3.14).

inch
Drive operating speed (n):

### Calculate your tools diameter (d)

The diameter (d) of the tool is a decisive factor for the calculation of cutting speed and rotational speed. Based on the available drive and its speeds, it is possible to calculate back which tool diameters can be used on the existing drive.

rpm
Diameter (d):

### Calculate the cutting speed (v)

The cutting speed (v) is the speed at which a tool cutting edge is guided through the material to be machined in the cutting direction and removes a chip. The cutting speed V is specified in feet per minute [fpm] or in feet per second [fps]. It depends on the speed of the drive n in revolutions per minute [rpm] and the diameter of the tool d x π (3.14).

inch
rpm
Cutting speed (v):