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01/2008 "Program" operating area
6.7 Free contour programming
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© Siemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition 6-295
DIN thread
In the case of standard thread undercuts, the characteristic size of the
thread pitch is P. The depth, length and transition radius of the
undercut are calculated according to the DIN standard. The (metric)
thread pitches specified in DIN 76 can be used. The arc-in angle can
be freely selected in the 30°-90° range. If the diameter is known when
selecting the undercut, an appropriate thread pitch is suggested.
Forms DIN 76 A (external control) and DIN 76 C (internal control) are
available. The program detects the two forms automatically using their
geometry and topology.
Thread general
Based on the thread undercut according to DIN (see above) you can
use the “General thread” undercut type to create specific undercuts,
e.g.,, for inch threads. The following inputs can be made:
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