HEIDENHAIN iTNC 530 (34049x-08) ISO programming - Manual (Page 440)

440 Programming: Multiple axis machining
12.4 Miscellaneous functions f
or r
otary ax
es
Exact stop at corners with nontangential
transitions: M134
Standard behavior
The standard behavior of the TNC during positioning with rotary axes
is to insert a transitional element in nontangential contour transitions.
The contour of the transitional element depends on the acceleration,
the rate of acceleration (jerk), and the defined tolerance for contour
deviation.
Behavior with M134
The TNC moves the tool during positioning with rotary axes so as to
perform an exact stop at nontangential contour transitions.
Effect
M134 becomes effective at the start of block, M135 at the end of
block.
You can reset M134 with M135. The TNC also resets M134 if you
select a new program in a program run operating mode.
Selecting tilting axes: M138
Standard behavior
The TNC performs M114 and M128, and tilts the working plane, only
in those axes for which the machine tool builder has set the
appropriate machine parameters.
Behavior with M138
The TNC performs the above functions only in those tilting axes that
you have defined using M138.
Effect
M138 becomes effective at the start of block.
You can reset M138 by reprogramming it without entering any axes.
Example NC blocks
Perform the above-mentioned functions only in the tilting axis C:
With MP7440 you can change the standard behavior of the
TNC so that M134 becomes active automatically
whenever a program is selected (see "General user
parameters", page 602).
N50 G00 Z+100 R0 M138 C *