Siemens SINUMERIK Series Function Manual page 518

M5: Measurement
7.5 Setting zeros, workpiece measuring and tool measuring
Two milling tools each with a reference point with tool counter-orientation in the approach direction
Two milling tools with one reference point with a tool position opposite to the orientation
In the present layout, the tool position $AC_MEAS_TOOL_MASK and approach direction to
the workpiece $AC_MEAS_DIR_APPROACH must be set as follows:
Left-hand tool: Approach direction and tool orientation +x
System variable
$AC_MEAS_TOOL_MASK = 0x2 + 0x200
$AC_MEAS_DIR_APPROACH = 0
Right-hand tool: Approach direction and tool orientation -x
$AC_MEAS_TOOL_MASK = 0x40
$AC_MEAS_DIR_APPROACH = 1
For both tools
$AC_MEAS_Px_COORD = 1
$AC_MEAS_SET_COORD = 1
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Meaning
Tool position in x direction (G19) + tool length
differential values are included negatively
Approach direction +x
Tool position in the -x direction
Approach direction -x
Coordinate system of x-th measuring point = BCS
Coordinate system of the setpoint = BCS
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Extended Functions