Siemens SINUMERIK 840D sl Function Manual page 89

The hundreds position of MD20482 is used to select which blocks outside the linear blocks
(G1) should be compressed.
Value
0xx
1xx
2xx
3xx
Programming
Tool orientation
If orientation transformation (TRAORI) is active, for 5-axis machines, tool orientation can be
programmed in the following way (independent of the kinematics):
• Programming of the direction vectors via:
A3=<...> B3=<...> C3=<...>
• Programming of the Eulerangles or RPY-angles via:
A2=<...> B2=<...> C2=<...>
Rotation of the tool
For six-axis machines you can program the tool rotation in addition to the tool orientation.
The angle of rotation is programmed with:
THETA=<...>
Note
NC blocks in which additional rotation is programmed, can only be compressed if the angle of
rotation changes linearly, meaning that a polynomial with PO[THT]=(...) for the angle of
rotation should not be programmed.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Meaning
Circular blocks and G0 blocks are not compressed. This is compatible with earlier SW
versions.
Circular blocks will be linearized and compressed by COMPCAD.
Advantage:
The compressor function works more accurate and therefore creates normally better
surfaces.
Disadvantage:
The compressor function is more sensitive to bugs in the NC programs. For reasons of
compatibility it might therefore be necessary to keep the setting 0xx.
G0 blocks are compressed - it is possible that a different tolerance becomes effective (see
MD20560 $MC_G0_TOLERANCE_FACTOR or NC command STOLF).
Advantage:
As a result that the tolerance has been set higher and the compression of G0 infeed
motion, these can be more quickly and more fluidly executed.
Combination of the two previous options: Circular blocks as well as G0 blocks are
compressed.
F2: Multi-axis transformations
1.9 Orientation
89