HEIDENHAIN TNC 370 User Manual page 146

5 Programming Tool Movements
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5.6 Path Contours - FK Free Contour Programming
Auxiliary points
Auxiliary points are entered for arcs in the same way as for straight lines.
Identifying closed contours
You can identify the beginning and end of a closed contour with the CLSD
soft key. This reduces the number of possible solutions for the last
contour element.
Enter CLSD as an addition to another contour data entry.
The closed contour results from the geometric context, for example from
a tangential transition.
Fig. 5.44: Auxiliary points on a free arc
A
Fig. 5.45: Beginning and end of a closed
contour
To program a closed contour:
2x
0
or lx
0
The contour element is the beginning of a closed contour, or the end
of a closed contour whose beginning was identified with CLSD+.
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TNC 370 5-47