Siemens SINUMERIK 840D Operator's Manual page 292

6
"Program" Operating Area
6.5 Free contour programming
DIN thread
General
thread
6-292
The characteristic size of the thread pitch for standard thread
undercuts 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.
Following the thread undercut according to DIN (Fig. above), each
special undercut, e.g. inch thread, can be generated with the "General
thread" undercut. The following inputs can be made:
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
6
03.04
Ó Siemens AG, 2004. All rights reserved