HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 155)

139 HEIDENHAIN TNC 410, TNC 426, TNC 430
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.
With the machine parameters 7440 you can change the
standard behavior of the TNC so that M134 becomes
active automatically whenever a program is selected
(see section 14.1 ”General User Parameters”).
Behavior with M134
The 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.
Selection of tilting axes: M138 (only TNC 426, TNC
430 with NC software 280 474-xx)
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 block
Perform the above-mentioned functions only in the tilting axis C:
L Z+100 R0 FMAX M138 C
7.5 Miscellaneous F
unctions f
o
r
Rotary A
x
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s
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