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Machining
Centre installed
with Trio MC224 Motion
Coordinator and Control
Techniques SLM
Technology based MultiAx
Converters and
Unimotor SL motors |
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Sample
Screen using Renishaw® software |
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Control
Techniques SLM technology uses high resolution SIN/COS encoder
with a speed loop processor coupled directly to the motor.
In this way a digital network consisting of the Motion Coordinator,
SLM and Drive is able to achieve a feedback resolution of
over 8.3 million points per turn, 50 nano seconds synchronisation
between any axis, local intelligence in the motor, up to 50%
less wiring, and elimination of the +10V analogue reference
signal.
“The
exceptional performance provided by Trio Motion Coordinators
equipped with SLM Daughter Boards in standard motion control
applications can now also be utilised as a very flexible CNC
“ said Bill Drury, Executive V.P. Technology of Control
Techniques Ltd.
Control Techniques announced a policy of close partnerships
with multi-axis motion control manufacturers from 1998. Trio
Motion Technology has been an active participant in this partnership,
producing an SLM Daughter Board for use with its own range
of Motion Coordinators. The Trio MC224/SLM offers 125us loop
control regardless of the number of axes in the system.
On
top of the increased performance, one of the aims of the partnership
is to provide “Plug and Play” capability to a
servo system. Bill Drury commented: “It has been seen
in the field that the Intelligent Drive set-up provided by
Trio’s MotionPerfect software is one of the simplest
servo-commissioning systems in the industry”.
The combination provided the spur to offer an enhanced system
to CNC machine tool builders which would also offer substantial
advantages when retrofitted to older machines. The Control
Techniques Research and Development Department retrofitted
a conventional CNC machining centre using MultiAx and an MC224
Motion Coordinator. Accuracy of table movement is assessed
using a Renishaw Ballbar® system, which permits the user
to capture data to a computer for detailed analysis. The whole
procedure, including initial set-up, takes about 10 minutes
of machine time. The high resolution feedback combined with
full digital interface to eliminate any delays, synchronisation
jitter and offsets leads to high dynamic and static stiffness,
enabling
the system to provide better accuracy and repeatability.
Early
tests with a variety of Drive/Motor combinations revealed
that under 10µm circularity error at speeds in excess
of 3m/sec can be achieved with virtually no speed reversal
spikes at the four points where the table drive motors reverse.
Machine tool operators are, of course, familiar with the potential
for error which derives from the mechanical and electronic
characteristics of the machine, and will take these effects
into consideration when programming each component.
Further,
the package will be of considerable interest to those who
wish to upgrade the performance of their existing CNC machines.
“The ease of programming of the Trio Motion Coordinator
allows the measured data to be used to compensate for the
mechanical errors caused by wear and tear,” said Bill
Drury. “The installation of a Control Techniques’
SLM system means that older machines can be given a new lease
of useful life at a relatively low cost, and users will gain
from the reliability and ease of use of the Trio controller.”
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“It
has been seen in the
field that the Intelligent Drive set-up provided by Trio’s
MotionPerfect software is one of the simplest servo-commissioning
systems
in the industry”.
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