HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 143)

127 HEIDENHAIN TNC 410, TNC 426, TNC 430
Contour filter: M124 (not TNC 426, TNC 430)
Standard behavior
The TNC includes all available points in its calculation of a contour
transition between contour elements.
Behavior with M124
You can adjust the effect of M124 by redefining machine
parameters.
The TNC filters contour elements with small point spacing and
inserts a transitional contour.
Shape of contour transition
■ Tangential circle: MP7415.0 = 0
an acceleration jump results from the change in the curvature at
the connection points.
■ Third-degree polynomial (cubic spline): MP7415.0 = 1
There is no velocity jump at the connection points.
■ Fifth-degree polynomial: MP7415.0 = 2
There is no acceleration jump at the connection points.
■ Seventh-degree polynomial: MP7415.0 = 3 (standard setting)
There is no jump in the rate of acceleration change.
Rounding of contour transitions
■ Do not round the contour transition: MP7415.1 = 0
execute the contour transition as defined in MP7415.0 (standard
contour transition: 7th-degree polynomial)
■ Round the contour transition: MP7415.1 = 1
Execute the contour transition so that the straight line segments
remaining between the contour transitions are also rounded.
Minimum length E of a contour element
With parameter E you define the length up to which the TNC should
filter contour elements out. If you have defined a permissible
contour deviation in M112, the TNC will respect it. If you do not
enter a maximum contour deviation, the TNC calculates the most
exact contour transition possible without reducing the programmed
feed rate.
7.4 Miscellaneous F
unctions f
or Cont
our
ing Beha
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