HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 379)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 379
4.29 Other G codes
C-angle offset G905
G905 measures the angular offset of workpiece transfer with rotating
spindle. The sum of angle C and the angle offset goes into effect as
the zero point shift of C axis. If you request the datum shift of the
current C-axis in the variable #a0 ( C,1) the sum of the programmed
datum shift and the measured offset angle is transferred.
The zero offset is effective internally as a direct zero point shift for the
respective C axis. The contents of the variables are retained even if the
control has been switched off.
You can also examine and reset the respectively active datum shift of
the C axis in the "Setup" menu in the "Set C-axis value" function.
Parameters
Q Number of the C axis
C Angle of additional zero point shift for offset gripping (–360°
<= C <= 360°) – (default: 0°)
Danger of collision!
 For narrow workpieces the jaws have to grip at an
offset.
 The zero point shift, C axis, remains in effect:
 After switch from Automatic to Manual mode
 After switch-off