Contour Approach And Retraction (Norm, Kont, Kontc, Kontt) - Siemens SINUMERIK 840D sl Programming Manual

10.2

Contour approach and retraction (NORM, KONT, KONTC, KONTT)

Function
If tool radius compensation is active (G41/G42), the NORM, KONT, KONTC or KONTT command
can be used to adapt the tool's approach and retract paths to the required contour profile or
blank form.
KONTC or KONTT ensure observance of the continuity conditions in all three axes. It is,
therefore, permissible to program a path component perpendicular to the offset plane
simultaneously.
Condition
The KONTC and KONTT commands will only be available if the "Polynomial interpolation"
option has been enabled in the control.
Syntax
G41/G42 NORM/KONT/KONTC/KONTT X... Y... Z...
...
G40 X... Y... Z...
Significance
NORM:
KONT:
KONTC:
KONTT:
Note
Only G1 blocks are permissible as original approach/retraction blocks for KONTC and KONTT.
The control replaces these with polynomials for the appropriate approach/retract path.
General conditions
KONTT and KONTC are not available in 3D variants of tool radius compensation (CUT3DC,
CUT3DCC, CUT3DF). If they are programmed, the control switches internally to NORM without
an error message.
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
10.2 Contour approach and retraction (NORM, KONT, KONTC, KONTT)
Activate direct approach/retraction to/from a straight line.
The tool is oriented perpendicular to the contour point.
Activate approach/retraction with travel around the starting/end point
according to the programmed corner behavior G450 or G451.
Activate approach/retraction with constant curvature.
Activate approach/retraction with constant tangent.
Tool radius compensation
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