Nc Block Compression (Compon, Compcurv, Compcad, Compof) - Siemens SINUMERIK 840D sl Programming Manual

Special motion commands

4.4 NC block compression (COMPON, COMPCURV, COMPCAD, COMPOF)

4.4 NC block compression (COMPON, COMPCURV, COMPCAD, COMPOF)
4.4
Function
CAD/CAM systems normally produce linear blocks, which meet the configured accuracy
specifications. In the case of complex contours, a large volume of data and short path
sections can result. The short path sections restrict the processing rate.
By using a compressor function, the contour, specified by using linear blocks, is approached
using polynomial blocks. This has the following advantages:
● Reduction of the number of required part program blocks for describing the workpiece
● Continuous block transitions
● Higher maximum path velocities
The following compressor functions are available:
● COMPON
● COMPCURV
● COMPCAD
COMPOF terminates the compressor function.
Syntax
COMPON
COMPCURV
COMPCAD
COMPOF
278
contour
The block transitions are only constant in the velocity , while acceleration of the
participating axes can be in jumps at block transitions.
Block transitions have continuous acceleration. This ensures both smooth velocity and
acceleration of all axes at block transitions.
The compression that uses a lot of computation time and memory space is optimized
regarding surface quality and speed. COMPCAD should only be used if measures to
improve the surface cannot be taken by the CAD/CAM program in advance.
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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