5 Programming Tool Movements
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5.7 M Functions for Contouring Behavior and Coordinate Data
Complete machining of open contours: M98
Standard behavior-without M98
The TNC calculates the intersections @ of the
radius-compensated tool paths at inside corners
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and changes traverse direction at these points. If
the corners are open on one side, however,
machining is incomplete.
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Machining open corners with M98
With the miscellaneous function MS8 the TNC
temporarily suspends radius compensation to
ensure that both corners are completely machined.
Duration of effect
The miscellaneous function M98 is effective only in
the blocks in which it is programmed.
Fig. 5.50: Tool path without M98
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Fig. 5.51: Tool path with M98
Programming example
10 L X ... Y ... RL F .................................................. Move to contour point 10
11
LX .. IY- ..... M98 ...............................................
Move to contour point 11
12 L IX + ................................................................ Move to contour point 12
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TNC 370
5-53
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