Compressor Functions; Compression Of Blocks For Linear And Circular Movement - Siemens SINUMERIK 840D sl Function Manual

the commands DYNROUGH, DYNSEMIFIN, and DYNFINISH and switched off via the commands
DYNNORM and DYNPOS.
See also
Rounding of tangential block transitions (G645) (Page 198)
Velocity-dependent jerk adaptation (axis-specific) (Page 268)
Free-form surface mode: Extension function (Page 206)
4.5

Compressor functions

4.5.1

Compression of blocks for linear and circular movement

Function
CAD/CAM systems generate a large number of linear and circular blocks, some of which with
very short path lengths, to describe complex contours. The maximum possible path velocity
is frequently limited by the block change time. As of a certain path velocity, not enough new
traversing blocks can be prepared in the preprocessing and switched to the main run.
The compressor functions replace consecutive linear and circular blocks with polynomial
blocks having the longest possible path lengths while achieving a parameterized contour
precision. This has the following advantages:
● Reduction of the number of traversing blocks
● Increasing the path velocity
● Increasing the surface quality
● Continuous block transitions
COMPON, COMPCURV
The compressor functions COMPON and COMPCURV generate one polynomial block from up to
ten consecutive linear blocks of the form: "G01 X... Y... Z... F...". The polynomial
blocks of the compressor functions have the following properties:
● COMPON: Continuous velocity block transitions.
● COMPCURV: Continuous velocity and acceleration block transitions
COMPCAD
The compressor function COMPCAD can generate one polynomial block from theoretically any
number of consecutive linear and circular blocks. The polynomial blocks have constant velocity
and acceleration at the block transitions. Corners that are desirable are identified as such and
taken into account.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
B1: Continuous-path mode, Exact stop, Look Ahead
4.5 Compressor functions
227