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March
2005 |
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 Soft
Servo's Advanced 3D Contour Control for High-Speed Machining |
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Soft Servo has re-engineered and improved their highly
advanced, highly specialized look-ahead function for
high-speed machining: three-dimensional dynamic look-ahead
contour control (3D-DLACC).
Look-ahead functions are becoming common in the CNC
marketplace, because they provide better performance
than conventional controls without look-ahead. Soft
Servos 3D-DLACC is no exception: it solves problems
with close points, corner rounding, gouging and overshooting.
However, Soft Servos technologically superior
and flexible 3D-DLACC is unique among the many different
look-ahead functions offered by CNC vendors for 3D contours,
milling or molding:
- 3D-DLACC
has a more advanced and complex algorithm for acceleration/
deceleration before interpolation, maximizing speed
and making the best use of the machines maximum
acceleration/deceleration rate, resulting in higher
performance.
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3D-DLACC looks ahead a constant one second, resulting
in greater efficiency and more consistent performance.
Most other look-ahead functions look ahead a certain
number of blocks: depending on the length of time
necessary to complete these blocks, the control could
be looking ahead too far (wasting computing power),
or may not be looking ahead long enough to decelerate
enough when needed.
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3D-DLACC provides flexibility, allowing a choice among
prioritizing accuracy, prioritizing speed, or finding
a balance between accuracy and speed that optimizes
cutting efficiency.
To
reach the highest possible accuracy while still maximizing
feedrates whenever possible, 3D-DLACC works without
any smoothing filter. (Smoothing filters, necessary
in the absence of look-ahead, deteriorate the precision
of multi-axis interpolation.)
To
increase speed by sacrificing some accuracy within
an allowable tolerance, 3D-DLACC works with an adjustable
smoothing filter. A long look-ahead smoothing filter
results in smoother motion and faster feedrates, with
a less accurate tool path; a shorter look-ahead smoothing
filter results in a more accurate tool path, with
slower feedrates.
Soft Servo's 3D-DLACC, soon to be the gold standard
of high-speed precision machining, is available for
our entire line of ServoWorks CNC products: MC-Quad,
S-100M, S-120M and S-140M.
3D-DLACC:
faster feedrates, higher precision.
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©
2005, Soft Servo Systems, Inc. All rights reserved.
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