HEIDENHAIN SW 68894x-02 - Manual (Page 392)

392 ICP programming
5.8
Cont
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Thread undercut DIN 76
Select the form elements.
Select Undercut DIN 76.
Enter the undercut parameters.
In smart.Turn, ICP generates a G25.
Parameters that are not defined are automatically calculated by the
CNC PILOT from the standard table (see "DIN 76—undercut
parameters" on page 579):
 The "thread pitch FP" is determined from the diameter.
 The parameters I, K, W, and R are calculated from the thread pitch
FP.
Parameters
FP
Thread pitch (default: value from standard table)
I Undercut depth (radius) (default: value from standard
table)
K Undercut length (default: value from standard table)
R Undercut radius (default: value from standard table)
W Undercut angle (default: value from standard table)
U, F, D, FP: See machining attributes Page 361
 If you are programming an internal thread, it is advisable
to preset the thread pitch FP, since the diameter of the
longitudinal element is not the thread diameter. If you
have the CNC PILOT calculate the thread pitch
automatically, slight deviations may occur.
 Undercuts can be programmed only between two linear
elements. One of the two linear elements must be
parallel to the X axis.