Siemens Sinumerik 840D sl Programming Manual page 494

Path traversing behavior
8.6 Repositioning to a contour (REPOSA, REPOSL, REPOSQ, REPOSQA, REPOSH, REPOSHA, DISR, DISPR,
Approach contour
The motion with which the tool is repositioned on the contour can be programmed. Enter zero
for the addresses of the axes to be traversed.
The REPOSA, REPOSQA and REPOSHA commands automatically reposition all axes.
Individual axis names need not be specified.
When the commands REPOSL, REPOSQ and REPOSH are programmed, all geometry axes are
traversed automatically, i.e. they need not be named in the command. All other axes must be
specified in the commands.
The following applies to the REPOSH and REPOSQ circular motions:
The circle is traversed in the specified working planes G17 to G19.
If you specify the third geometry axis (infeed direction) in the approach block, the
repositioning point is approached along a helix in case the tool position and programmed
position in the infeed direction do not coincide.
In the following cases, the control automatically
switches over to linear approach REPOSL:
• You have not specified a value for DISR.
• No defined approach direction is available (program interruption in a block without travel
information).
• With an approach direction that is perpendicular to the current working plane.
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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