HEIDENHAIN TNC 410 ISO Programming - Manual (Page 183)

HEIDENHAIN TNC 410, TNC 426, TNC 430 157
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Programming M124
If in a positioning block (with the dialog "Miscellaneous function") you
press the soft key M124, the TNC then continues the dialog for this
block and asks for the tolerance value E.
You can also define E through Q parameters, see “Principle and
Overview,” page 330.
Effect
M124 becomes effective at the start of block. Like M112, M124 is
reset with M113.
Example NC block
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
N50 G01 G40 X+123.723 Y+25.491 F800 M124 E0.01 *
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