Siemens SINUMERIK 840D Manual page 67

Key functions for 5-axis machining
3.6.1 Compressor – COMPCAD
The compressor is ideally called in CYCLE832. If it is to be programmed separately, then pro-
ceed as described below.
Explanation of the commands
COMPOF
COMPCAD
COMPCURV
Operating principle of the compressor
1 2
Programming
COMPOF
COMPCAD
COMPCURV
© Siemens AG All rights reserved. SINUMERIK, Manual, 5-axis machining
Compressor off
Compressor on - surface quality and speed are further optimized.
COMPCAD smoothes the points along the characteristic before
approximation
(B spline) and offers, at a high path velocity, the highest degree of
accuracy with transitions that have a constant acceleration rate.
Preferably used to mill free-form surfaces (recommended).
Compressor on
G1 blocks are approached using a polynomial. Block transitions
are jerk-free. Preferably used for circumferential milling.
In accordance with the specified tolerance
3
band, 1
of G1 commands,
compresses them into a spline
be directly executed by the control. A new
contour is created whose characteristic lies
within the specified tolerance range.
The compressor generates smooth paths and
paths with constant curvature. The constant
curvature results in a steady velocity and
acceleration characteristic, meaning that the
machine can run at higher speeds, thereby
increasing productivity.
3.6
the compressor takes a sequence
2 combines them and
, which can
3
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