Siemens SINUMERIK 840D sl Function Manual page 228

B1: Continuous-path mode, Exact stop, Look Ahead
4.5 Compressor functions
COMPCAD is very CPU time and memory-intensive. It is therefore recommended that
COMPCAD only be used where surface improvements were not successful by measures taken
within the CAD/CAM program.
Common features
● If commands that are not traverse commands, e.g. auxiliary function output, are
programmed in and between the traversing blocks to be compressed, compression will be
interrupted.
● The maximum tolerable deviation of the calculated path to the programmed positions can
be specified in machine data for all compressor functions. Unlike COMPON and COMPCURV,
the parameterized tolerances are not used in different directions in neighboring paths with
COMPCAD.
Parameterization
The compressor functions are parameterized in the following machine data and setting data:
Axis-specific machine data
Number
MD33100
Channel-specific machine data
Number
MD20170
MD20172
MD20482
MD20484
MD20485
MD20486
MD20487
Channel-specific setting data
Number
SD42470
SD42475
SD42476
SD42477
228
Identifier $MA_
COMPRESS_POS_TOL
Identifier $MC_
COMPRESS_BLOCK_PATH_LIMIT
COMPRESS_VELO_TOL
COMPRESSOR_MODE
COMPRESSOR_PERFORMANCE
COMPRESS_SMOOTH_FACTOR
COMPRESS_SPLINE_DEGREE
COMPRESS_SMOOTH_FACTOR_2
Identifier $SC_
CRIT_SPLINE_ANGLE
COMPRESS_CONTUR_TOL
COMPRESS_ORI_TOL
COMPRESS_ORI_ROT_TOL
Meaning
Maximum permissible axis-specific path deviation
with compression
Meaning
Maximum traversing length of a block for compres‐
sion
Maximum permissible deviation from path feed for
compression
Setting the mode of operation of the compressor
Compressor performance
Smoothing factor for compression
Compressor spline degree
Smoothing factor 2 for compression
Meaning
Corner limit angle for COMPCAD
Maximum permissible contour deviation with com‐
pression
Maximum deviation of the tool orientation for com‐
pression
Maximum deviation of the tool rotation for com‐
pression
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions