On 22 December 2012 21:29, Stephen Dubovsky <smdubov...@gmail.com> wrote:

>  AFAIK linuxcnc can only do the position loop so I leave the drive to handle 
> the
> current + velocity loops.

There is no reason that you can't cascade your PID loops in HAL.
You would want to make sure the execution order was correct, but you
could have one PID controlling motor velocity driven my a PID
controlling position via velocity commands.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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