# Overview

## Task

To home a machine axis, the actual position value system of the machine axis must be synchronised

- with the axis coordinate system of the machine and
- the CNC.

## Characteristics

All machine axes that must be positioned and have no encoder (which supplies an actual value absolute position) must be homed.

Speed-controlled or only endlessly position-controlled spindles need not be homed.

Homing (RPF) is possible for the following axis types (P-AXIS-00018):

- Linear axes
- Rotary axes
- Spindles

## Parameterisation

Homing must be parameterised for every axis in the axis parameter list.

For more information on this function, see the chapter Parameterisation.

## Programming

Homing is commanded with by the NC command G74 or by starting the 'Homing’ mode.