HEIDENHAIN TNC 370 User Manual page 155

5 Programming Tool Movements
4
5.7
M Functions for Contouring Behavior and Coordinate Data
Feed rate at circular arcs: M109/Ml lo/Ml 11
Standard behavior - Ml 11
The programmed feed rate refers to the center of the tool path.
Constant contouring speed at circular arcs (feed rate increase and decrease) - Ml09
The TNC reduces the feed rate for circular arcs at inside contours such
that the feed rate at the tool cutting edge remains constant. At outside
contours the feed rate for circular arcs is correspondingly increased.
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Constant contouring speed at circular arcs (feed rate decrease only) - Ml10
The TNC reduces the feed rate for circular arcs only at inside contours. At
outside contours the feed rate remains the same.
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TNC 370 -