Re: [CAD_CAM_EDM_DRO] PID primer, was Dedicated mb for PID

Used 'em for many years. Now a happy EMC user.

It is true that with coordinated motion I had to start the next move from
a breakpoint interrupt at about the final deceleration point on the
trapezoidal move.
And I had to do this in the main cpu. Maxed out at about 1kHz servo update.
It was ok 10 or 15 years ago but there are better things out there now.
The data sheet is a very good pid primer though.
...working on that way scraping thing...


Les
Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.rabun.net/~leswatts/shop.html

----- Original Message -----
From: "Doug Harrison" <prototype@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, July 02, 2002 12:31 AM
Subject: Re: [CAD_CAM_EDM_DRO] PID primer, was Dedicated mb for PID


>
> ----- Original Message -----
> From: Jon Elson <elson@...>
>
> > I'm not sure the LM628 and LM629 are very useful. I looked into them
> quite
> > deeply at one time. I also talked to the applications engineers at
> National
> > about keeping multiple axes synchronized. My worry was about circular
> > interpolation, which is not really supported in the chip.
>
> They don't appear to have been designed with coordinated motion in mind.
I
> was more impressed by the explanation of how they worked.
>
> Doug
>