## PFERD Rotational speed calculator

Calculate the optimum speed, tool diameter or cutting speed.

### Calculate the optimum rotational speed (n)

The drive speed (n) is specified in revolutions per minute [min-1]. The required speed is determined from the cutting speed V in meters per minute [m/min] or in meters per second [m/s] and the diameter of the tool d x π (3.14).

Notice:
The speed specifications of the tools refer to use under load.

mm
Drive 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.

min-1
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 meters per minute [m/min] or in meters per second [m/s]. It depends on the speed of the drive n in revolutions per minute [min-1] and the diameter of the tool d x π (3.14).

mm
min-1
Cutting speed (v):
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