Siemens SINUMERIK 840D

7
Transformations 08.97
7.3 C
y
linder surface transformation: TRACYL
7
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC 810D 840Di

Siemens AG 2000. All rights reserved
7-244
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA)
−
04.00 Edition
Special cases:
•
TRC selection:
TRC is not programmed according to the TRC
but relative to the programmed groove center
line. G42 is programmed so that the tool travels
to the left of the groove side (instead of G41).
You do not have to do this if the groove width is
specified with a negative leading sign in OFFN.
•
OFFN with TRACYL has a different effect from
without TRACYL. As OFFN is also included in the
calculation without TRACYL when TRC is active,
OFFN should be set back to zero after
TRAFOOF.
•
It is possible to change OFFN within the part
program. This means that the groove center line
could be moved from the center (see Figure).
•
Control grooves:
With TRACYL the same groove is not generated
for control grooves (as if it were manufactured
using a tool whose diameter is the same as the
groove width).
In principle, it is not possible to generate the
same groove side geometry with a smaller
cylindrical tool as with a larger one.
TRACYL minimizes errors. In order to prevent
inaccuracies from occuring, the tool radius should
only be slightly smaller than half of the groove
width.