HEIDENHAIN iTNC 530 (340 420) - Manual (Page 218)

190 7 Programming: Miscellaneous-Functions
7.
4 Miscellaneous F
unctions f
o
r Cont
our
ing Beha
vior
Example NC blocks
Machining open contours: M98
Standard behavior
The TNC calculates the intersections of the cutter paths at inside
corners 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.
Behavior with M98
With the miscellaneous function M98, the TNC temporarily suspends
radius compensation to ensure that both corners are completely
machined.
Effect
M98 is effective only in the blocks in which it is programmed.
M98 takes effect at the end of block.
Example NC blocks
Move to the contour points 10, 11 and 12 in succession:
5 TOOL DEF L ... R+20 Large tool radius
...
13 L X... Y... R... F... M97 Move to contour point 13
14 L IY-0.5 ... R... F... Machine small contour step 13 to 14
15 L IX+100 ... Move to contour point 15
16 L IY+0.5 ... R... F... M97 Machine small contour step 15 to 16
17 L X... Y... Move to contour point 17
10 L X... Y... RL F
11 L X... IY... M98
12 L IX+ ...
X
Y
S S
X
Y
11 12
10