5
Special Motion Commands 04.00
5.3 Com
ressor COMPON/COMPCURV
5
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC
810D
840Di
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Siemens AG 2000. All rights reserved
5-160
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA)
−
04.00 Edition
5.3 Compressor COMPON/COMPCURV
As a rule, CAD/CAM systems provide linear blocks
that meet the programmed accuracy.
With complex contours this leads to a considerable
amount of data and to short path sections. These
short path sections restrict the execution speed.
With the compressor a certain number (max. 10) of
these short path sections can be joined together to
form one path section.
The modal G code COMPON or COMPCURV
activates an "NC block compressor".
With linear interpolation, this function groups a
number of straight blocks (number is restricted to
10) and approaches them by means of third degree
polynomials (COMPON), or five degree polynomials
(COMPCURV), within an error tolerance range
specified via machine data. In this way, the NC
processes one large motion block rather than a large
number of small ones.
This compression operation can only be executed on
linear blocks (G1). It is interrupted by any other type
of NC instruction, e.g. an auxiliary function output,
but not by parameter calculations.
Blocks to be compressed may contain only block
number, G1, axis addresses, feed and comment.
This sequence is mandatory. Variables may not be
used.
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