HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 171)

TNC 426/TNC 425/TNC 415 B/TNC 407 5 - 3 8
5 Programming Tool Movements
Fig. 5.46: Tool path without M98
5.6 M Functions for Contouring Behavior
S S
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Machining open contours: M98
Standard behavior – without M98
The TNC calculates the intersections S of the
cutter paths and moves the tool in the new
direction at those points. If the contour is open at
the corners, however, this will result in incomplete
machining.
Machining open corners with M98
With M98, the TNC temporarily suspends radius
compensation to ensure that both corners are
completely machined.
Duration of effect
M98 is effective only in the blocks in which it is
programmed.
Program structure
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
Fig. 5.47: Tool path with M98
11 12
10