Re: [CAD_CAM_EDM_DRO] steppers+feedback+emc

If your stepper system is designed properly and you are not trying to cut
too deep in one pass, you should not be loosing steps.

Using my Porter Cable 3.25 hp router, I generally make three passes on a
3/4" piece of red oak. With a 1/2" MDF, I make it in two passes.

My cnc router uses 350 oz/in steppers driven by Gecko drives. My lead
screws are 4 turns per inch.

Bob Campbell

----- Original Message -----
From: "awallin25" <anders.wallin@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, September 24, 2002 9:40 AM
Subject: [CAD_CAM_EDM_DRO] steppers+feedback+emc


>
> after milling some mdf with a stepper controlled table I think i need
> to add feedback(encoders) to eliminate missed steps...
>
> my question is:
>
> would it be possible to hook up the encoders directly to the pc and
> let EMC read them and act accordingly, ie. implement a PID controller
> in (real-time) software ?
> the parallell port pins won't be enough(?), but what other options
> are available ? (serial?)
>
> also, a question for EMC users: how does PC speed affect the speed at
> wich you can do interpolated(linear, cubic etc.) runs on a mill?
>
> thanx for any answers.
>
>
>
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