Siemens sinumerik 840d Programming Manual page 244

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Transformations

7.3 Cylinder surface transformation: TRACYL

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

• 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

SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition

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