Re: Re: Re: Feedback/DRO DIY

>    From: "William Scalione" <wscalione@...>
>
> If you are trying to cure lost step problems with an encoder feedback
> loop, I would advise against it. You should fix the problem first as it
> is probably caused by EMC putting out ragged step pusles. If you are
> using steppermod try freqmod, although even that pulse train is not the
> best, it's better than steppermod. Problem with encoder feedback with
> steppers is, missed pulses are probably caused by uneven pulses or too
> high of an acceleration (could be caused by uneven pulses) when EMC
> senses a missed step it will try to spit out pulses even faster to
> compensate, causing even more missed steps, causing EMC to spit out
> pulses even faster etc, etc.
>
> If you are using Geckos, try adding the pulse multiplier board as it
> will then generate it's own pulse train which should be cleaner than
> EMC's. Or you can try another program which may have a better pulse
> train than EMC.
>
> Just my 2 cents
>
> Bill

Hi Bill

A while back he was using TurboCNC.

>    Date: Sun, 12 Jan 2003 13:26:22 -0000
>    From: "abbylynx <abbylynx@...>" <abbylynx@...>
> Subject: Adding encoders to existing stepper system?

<s>

> Finally, what software to use? At the moment I'm using TurboCNC, but
> EMC does look quite appealing (especially the price :)  )

I'm with you about trying to fix the problem in open loop before you get
dependent on feedback. I know that axis oiling and tuning will help
quite a bit with Sherline mills.

Ray