A CNC machine tool is provided with a fixed position. Normally, tool
change and programming of absolute zero point as described later are
performed at this position. This position is called the reference position.
Fig. 1.3.1 (a) Reference position
The tool can be moved to the reference position in two ways:
1. Manual reference position return (See III–3.1)
Reference position return is performed by manual button operation.
2. Automatic reference position return (See II–6)
In general, manual reference position return is performed first after
the power is turned on. In order to move the tool to the reference
position for tool change thereafter, the function of automatic
reference position return is used.
PART DRAWING AND