> From: [email protected]
> To: [email protected]
> Date: Mon, 18 Feb 2013 22:15:18 +0000
> Subject: Re: [Emc-users] Spindle rpm display
>
>
> So something like this could work?:
>
>
> # load a near component and attach it to a thread
> loadrt near
> addf near.0 servo-thread
>
> # connect one input to the commanded spindle speed
> net spindle-cmd => near.0.in1
>
> # connect one input to the encoder-measured spindle speed
> net stepgen.2.velocity-fb => near.0.in2
>
> # connect the output to the spindle-at-speed input
> net spindle-at-speed motion.spindle-at-speed <= near.0.out
>
> # set the spindle speed inputs to agree if within 1%
> setp near.0.scale 1.01
>
That's the idea.
Don't forget the addf command for the near component
and check that the cmd speed and feedback speed are the same units.
I can't remember if the near expects absolute values or not ...
I would bet 1% is too tight a tolerance without filtering .
Sorry it's been awhile since I looked at this in detail so forget the details...
Chris M
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