## Torque M (Nm)

Referring to the rotating axle, torque, also called rotary force, is the product of the force (F) multiplied by the length of the lever arm (I). The formula is:

*M = F x I *

| measured in Nm |

| measured in N |

| measured in m |

A former measuring unit for torque was kpm. 1 mkp 9,81 Nm In the case of gearbox transmission ratios, torque is inversely proportional to the rotational speed; a fact which is expressed by this formula:

*n*_{1} : *n*_{2} = *M*_{2} :* M*_{1}

| = motor speed |

| = spindle speed |

| = motor torque |

| = spindle torque |

Example:motor speed = 25 000 RPM motor torque = 5 Nm,spindle speed = 1000 RPMThe spindle torque is:

n_{1}xM_{1}

M_{2}= ————————VM_{2}n_{2}

25000 x 5 25 x 5

M_{2}= ———————————— = ————————— = 125 Nm

1000 1