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'[PIC] Coordinated two axis with servo motors'
2002\09\24@161055 by James Williams

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Hello,

Does anyone know exactly how servo systems are coordinated motion over two
axis.  I mean I know one axis will be the master at any given time, but how
does the slave correctly coordinate with being actuate.  Does it only move a
unit when commanded to like with steppers or what?  Any good links to help
with this?


Regards,

James

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2002\09\24@170546 by Madhu Annapragada

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The coordination depends on who is doing the trajectory generation. If the
trajectory is being generated by a dedicated DSP built for the purpose,
then extremely tight coordination can be achieved; which is what is needed
for, say, CNC machines. For example, Performance motion devices
(http://www.pmd-corp.com) has a new chipset out that is capable of multi-axis
co-ordination. Keep in mind that synchronizing the trajectory generation
for multi axes machines doesn't necessarily translate to perfect end point
control. You also have to make sure that the delays inherent in the
amplifier are matched between the various axes. Due to this and various
other reasons, designers build multi-axis controllers and amplifiers in one
package and pay particular attention to propagation delays between the
various axes. If the coordination is not very critical (say you can
tolerate a certain skew in machining a circle) then you can get away by a
central trajectory generator feeding separate amplifiers.
Madhu

> Hello,
>
> Does anyone know exactly how servo systems are coordinated motion over
two
> axis.  I mean I know one axis will be the master at any given time, but
how
> does the slave correctly coordinate with being actuate.  Does it only
move a
> unit when commanded to like with steppers or what?  Any good links to
help
> with this?
> Regards,
> James

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2002\09\25@154128 by Roman Black

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face
James Williams wrote:

> Does anyone know exactly how servo systems are coordinated motion over two
> axis.  I mean I know one axis will be the master at any given time, but how
> does the slave correctly coordinate with being actuate.  Does it only move a
> unit when commanded to like with steppers or what?  Any good links to help
> with this?


Have you tried googling for "motion control
axis bresenham" or similar?

You should find plenty of links with that. :o)
-Roman

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