Siemens SINUMERIK 840Di sl Programming Manual page 358

Tool offsets
8.9 Contour approach and retraction (NORM, KONT, KONTC, KONTT)
Deactivate compensation mode, G40, NORM
The tool is positioned perpendicular to the last compensated path end point and then travels
directly in a straight line to the next uncompensated position, e.g., to the tool change
location.
Choosing the retraction point
When NORM is active, the tool travels directly to the uncompensated position irrespective of
the approach angle programmed for the travel movement (see diagram).
Warning
The following applies to approach and retraction movements:
You should make allowance for the modified angles of travel when programming in order to
avoid collisions.
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals