Siemens SINUMERIK 828D Function Manual page 207

Compressing G0 blocks
The compression of G0 blocks is set for specific channels using the hundreds position in the machine data:
MD20482 $MC_COMPRESSOR_MODE (mode of compression)
Value Meaning
0xx Circular blocks and G0 blocks are not compressed.
1xx Circular blocks are compressed. Only COMPCAD.
2xx G0 blocks are compressed.
See also MD20560 $MC_G0_TOLERANCE_FACTOR or NC command STOLF
3xx Circular blocks and G0 blocks are compressed.
A more detailed description of MD20482 can be found in:
References:
Function Manual Special Functions; Multi-Axis Transformations (F2),
Chapter: "Compression of the orientation"
Programming
The tolerance factor set using MD20560 $MC_G0_TOLERANCE_FACTOR can be temporarily overwritten by
programming STOLF in the part program:
Syntax:
STOLF=<...>
Example:
Program code
COMPCAD G645 G1 F10000
X... Y... Z...
X... Y... Z...
X... Y... Z...
G0 X... Y... Z...
G0 X... Y... Z...
CTOL=0.02
STOLF=4
G1 X... Y... Z...
X... Y... Z...
X... Y... Z...
G0 X... Y... Z...
X... Y... Z...
The value in MD20560 is not changed by programming the tolerance factor. After a reset or end of part program,
the value set using MD20560 is effective again.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Comment
; Compressor function COMPCAD
; The machine and setting data apply here.
; Machine data $MC_G0_TOLERANCE_FACTOR (e.g. =3), is
effective here, i.e. a smoothing tolerance of
$MC_G0_TOLERANCE_FACTOR*$MA_COMPRESS_POS_TOL.
; A contour tolerance of 0.02mm is applied starting from
here.
; From here, a G0 tolerance factor of 4 applies, i.e. a
contour tolerance of 0.08mm.
B1: Continuous­path Mode, Exact Stop, LookAhead
3.7 Tolerance and compression of G0 blocks
207