Meaning
G74: G command call reference point approach
X1=0 Y1=0 Z1=0 … : The specified machine axis address X1, Y1, Z1 … for linear axes is
approached as the reference point.
A1=0 B1=0 C1=0 … : The specified machine axis address A1, B1, C1 … for rotary axes is
approached as the reference point.
Note
A transformation must not be programmed for an axis which is to approach the reference point
with G74.
The transformation is deactivated with command TRAFOOF.
Example
When the measuring system is changed, the reference point is approached and the workpiece
zero point is set up.
Program code Comment
N10 SPOS=0 ;Spindle in position control
N20 G74 X1=0 Y1=0 Z1=0 C1=0 ;Reference point approach for linear axes and
rotary axes
N30 G54 ; Zero offset
N40 L47 ;Cutting program
N50 M30 ; End of program
2.14.5 Approaching a fixed point (G75)
The non-modal command G75 can be used to move axes individually and independently of one
another to fixed points in the machine space, e.g. to tool change points, loading points, pallet
change points, etc.
The fixed points are positions in the machine coordinate system which are stored in the
machine data (MD30600 $MA_FIX_POINT_POS[n]). A maximum of four fixed points can be
defined for each axis.
The fixed points can be approached from every NC program irrespective of the current tool or
workpiece positions. An internal preprocessing stop is executed prior to moving the axes.
Fundamentals
2.14 Supplementary commands
NC programming
358 Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
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