Re: [CAD_CAM_EDM_DRO] acceleration profille

----- Original Message -----
From: "Alan Marconett KM6VV" <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, July 27, 2002 5:29 PM
Subject: Re: [CAD_CAM_EDM_DRO] acceleration profille


> Hi Michael,
>
> A linear acceleration or deceleration might be easier to do, but not the
> best. You might take a look at a manual for the CY545 stepper
> controller from Cybernetic Microsystems.
>
> http://controlchips.com
>
> Look at the rate tables, and the plots of acceleration/deceleration.
> There's also some useful information on steppers in the manual.
>
> I use a similar table in my controller program to do
> acceleration/deceleration. An acceleration term determines how fast the
> controller program runs up/down the table.
>
> Don't know what you mean by "skipping a step" at almost full speed. The
> time between steps simply changes.
>
> Alan KM6VV
>
>
> Michael Holm wrote:
> >
> > I also made a stepper controlling software. This one runs under windows,
and
> > does linar acceleration.
> >
> > I did some thinking on that, and was about to make a user-editable
> > acceleration curve, because I was in doubt if it should be linar.But if
you
> > think hard about it, it makes no sense to make it curved curve, as that
> > would mean that you'd have to skip just one step at some point, when
running
> > almost full speed, and that have to be even harder then starting at full
> > speed.
> >
> > So it has to be linar interpolated.
> >
> > Draw a curved acceleration curve on a piece of squared paper (using only
> > full squares, representing one step) and you'll understand what I mean.
> >
> > --Michael
>
>
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