Siemens SINUMERIK 840D sl Function Manual page 419

12.TRAFOOF.
13.Reselect original coordinate shift (frame).
Contour offset (OFFN)
In order to mill grooves using TRACYL transformation 513, the center line of the groove and
half of the groove width via the OFFN address are programmed in the part program.
To avoid damage to the groove side, OFFN acts only when the tool radius compensation is
active.
It is possible to change OFFN within a part program. This allows the groove center line to be
offset from the center:
Note
OFFN should be at least as large as the tool radius to avoid damage occurring to the opposite
side of the groove wall.
Note
OFFN acts differently with TRACYL than it does without TRACYL. Since, even without
TRACYL, OFFN is included when TRC is active, OFFN should be reset to zero after TRAFOOF.
NOTICE
Effect of OFFN depends on the transformation type
For TRACYL transformation 513 (TRACYL with groove side offset), half the groove width is
programmed for OFFN.
For TRACYL transformation 512 (TRACYL with groove side offset), the value of OFFN acts
as an allowance for the TRC.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
7.2 TRACYL cylinder surface transformation (option)
M1: Kinematic transformation
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