HEIDENHAIN TNC 360 ISO Programming - Manual (Page 121)

TNC 360 5-38
5 Programming Tool Movements
Fig. 5.45: Tool path with M98
Fig. 5.44: Tool path without M98
Machining open contours: M98
Standard behavior – without M98
The TNC calculates the intersections S
of the radius-compensated tool paths at inside
corners and changes traverse direction at these
points. If the corners are open on one side, how-
ever, machining is incomplete.
Machining open corners – with M98
With the miscellaneous function M98 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.
Program example
N10 X ... Y ... G41 F .. ............................................. Move to contour point 10
N20 X ... Y–... M98 .................................................. Machine contour point 11
N30 X + ... ............................................................... Move to contour point 12
5.6 M Functions for Contouring Behavior
S S
11 12
10
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