HEIDENHAIN iTNC 530 (340 420) ISO programming - Manual (Page 193)

HEIDENHAIN iTNC 530 193
7.
4 Miscellaneous F
unctions f
o
r Cont
our
ing Beha
vior
Machining small contour steps: M97
Standard behavior
The TNC inserts a transition arc at outside corners. If the contour steps
are very small, however, the tool would damage the contour.
In such cases the TNC interrupts program run and generates the error
message “Tool radius too large.”
Behavior with M97
The TNC calculates the intersection of the contour elements—as at
inside corners—and moves the tool over this point.
Program M97 in the same block as the outside corner.
Effect
M97 is effective only in the blocks in which it is programmed.
Example NC blocks
A corner machined with M97 will not be completely
finished. You may wish to rework the contour with a
smaller tool.
X
Y
X
Y
S
16
17
15 14
13
S
N50 G99 G01 ... R+20 * Large tool radius
...
N130 X ... Y ... F .. M97 * Move to contour point 13
N140 G91 Y–0.5 .... F.. * Machine small contour step 13 to 14
N150 X+100 ... * Move to contour point 15
N160 Y+0.5 ... F.. M97 * Machine small contour step 15 to 16
N170 G90 X ... Y ... * Move to contour point 17