SINUMERIK InSight
Volumetric Compensation System
Attention! Machine tools can be more accurate!
E-Brochure - January 2009
The situation
The idea
Every machine tool falls victim to minor,
systematic geometric errors in the feed
axis control system. On any linear axis
these are linear position errors, horizontal
and vertical straightness errors as well as
roll, pitch and yaw. Further inaccuracies
take the form of squareness errors
between the machine components. On a
3-axis machine, the geometric errors on
the tool holder alone add up to 21.
Additionally, geometric errors have to be
taken into account for 5-axis machines.
To use brand new compensation methods
integrated in the control system to fully
compensate geometric errors.
SINUMERIK
Answers for industry.
The solution
With the Volumetric Compensation System
(VCS) of SINUMERIK 840D solution line, it is
possible to achieve a further significant
reduction in the residual positioning error
within the entire work envelope for 3-axis
machines as well for 5-axis machines.
SINUMERIK
Volumetric Compensation System Attention! Machine tools can be more accurate!
Description of function:
All 21 geometric errors on the linear axes are measured
before the VCS control option is commissioned. SINUMERIK
"Solution Partners" can provide, for example, this laser
calibration service. The recorded error curves are converted
to a VCS file and stored on the SINUMERIK 840D sl. Users of
Renishaw, API and Etalon laser measurement systems can
employ software tools developed by the instrument
manufacturer with which individual curves can be converted
to the VCS file format required by SINUMERIK CNCs quickly,
easily and reliably.
The errors on the rotary axes can be identified within
minutes by the SINUMERIK cycle 996 "Measuring
kinematics". At the push of a button, the cycle results are
simply transferred to the Traori machine data to compensate
the errors. When both the functions VCS and Traori are
activated, the accuracy throughout the work envelope of the
3-axis or 5-axis machine is improved.
What the customer says:
VCS was extensively tested by the Italian machine
manufacturer Breton on a 5-axis Flymill of type 1000/2T DD
K20 .
For Breton's technical director Giuseppe Andorlini, this much
is certain: "With VCS software the CNC can dynamically
compensate not only the traditional positioning errors of
each axis but also the geometrical errors inside of the total
working volume.
This means that the machine builder can maintains its stated
precision reducing the scraping time or, as we have tested,
can increases the machine precision maintaining its stated
standard.
VCS is a very good software to improve machine precision in
the working volume to reach very high precision at the tool
tip in 5 axis contouring.
VCS software is easy to install and with Renishaw system it is
possible to update VCS parameters by our technicians and
reducing the needed time only at few hours ".
Siemens AG
Sector Industry
Drive Technologies
Motion Control
Postfach 3180
91050 ERLANGEN
GERMANY
Subject to change without prior notice
Order No.: 6ZB5411-0CA02-0AA0
BR 0109 PDF VOG 2 En / 3P.8122.54.04
Only available electronically
© Siemens AG 2009
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characteristics of performance which in case of actual use do not
always apply as described or which may change as a result of
furtherdevelopment of the products.
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