Incrementally Programmed Compensation Values; G91 Extension - Siemens SINUMERIK 840D sl Function Manual

W1: Tool offset

2.10 Incrementally programmed compensation values

In block N260, contrary to block N200, CUTMOD=2 is effective. As a result of the tool holder
rotation that can be orientated, the modified cutting edge position becomes 8. Deviating axis
positions also result from this.
The tool radius compensation (TRC) is activated in blocks N220 and/or N270. The different
cutting edge position in both program sections has no effect on the end positions of the blocks
in which the TRC is active; the corresponding positions are therefore identical. The different
cutting edge positions only become effective again in the deselect blocks N260 and/or N300.
2.10 Incrementally programmed compensation values
2.10.1

G91 extension

Requirements
Incremental programming with G91 is defined such that the compensation value is traversed
additively to the incrementally programmed value when a tool offset is selected.
Applications
For applications such as scratching, it is necessary only to traverse the path programmed in the
incremental coordinates. The activated tool offset is not traversed.
Sequence
Selection of a tool offset with incremental programming
● Scratch workpiece with tool tip.
● Save the actual position in the basic frame (set actual value) after reducing it by the tool
offset.
● Traverse incrementally from the zero position.
Activation
It is possible to set whether a changed tool length is traversed with FRAME and incremental
programming of an axis, or whether only the programmed path is traversed with the setting data:
SD42442 $SC_TOOL_OFFSET_INCR_PROG (tool length compensations)
Zero offset / frames G91
It is possible to set whether a zero offset is traversed as standard with value = 1 with FRAME and
incremental programming of an axis, or whether only the programmed path is traversed with
value = 0 with the setting data:
SD42440 $SC_FRAME_OFFSET_INCR_PROG (zero offset in frames)
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Function Manual, 06/2019, A5E47435126B AA
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