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# Rotor Calculator

Depending on the shredder frame size and driving power in combination with the hammer weight the static load of a hammer in rotation can be calculated.

The rotor calculator needs the following input:

• rotor diameter
• rotor rpm
• hammer weight

It then calculates:

• the speed of your hammers on the rotor in operation
• the centrifugal force caused by hammer mass and rotation that is pulling at the hammer pin (FRot)
• the kinetic energy the hammer uses for shredding, caused by hammer mass and hammer speed (impact energy)

By filling in Machine 1 and Machine 2 you can directly compare the results of rpm changes to your process.

Auto-calculate example
 Machine 1: Rotor d [m]: r [m] = 0 r [in] = 0 rpm [1/min]: rps [1/s] = 0 Hammer m [kg]: = 0 lb v [m/s] = 0 m/s = 0 km/h = 0 mph FRot = 0 kN = 0 t = 0 lb Ekin = 0 kJ
Auto-calculate example
 Machine 2: Rotor d [m]: r [m] = 0 r [in] = 0 rpm [1/min]: rps [1/s] = 0 Hammer m [kg]: = 0 lb v [m/s] = 0 m/s = 0 km/h = 0 mph FRot = 0 kN = 0 t = 0 lb Ekin = 0 kJ

A car weighing 2.0 metric tons (4,409 lb) driving 50 km/h (31 mph) has 1.2 kJ impact energy.