Re: December build of EMC

> From: "Tim Goldstein" <timg@...>
>
> Has anyone else tried running the Dec. 1999 build of EMC with steppers yet?
>
> I tried it on my system this weekend and while I would occasionally get the
> table to move, more often I just got a terrible racket as the steppers were
> accelerated past their ability to keep up. I reinstalled the Nov. 1999

build

> and everything was then fine at all speeds.

The 07-dec release was sort of an interim version Fred made for me to try out
some new stepper motor code ideas. It didn't work for me either, but I do
have some improvements you could try to patch in if you're interested. On
Friday 10 Dec Fred brought an oscilloscope over to my shop and we spent 5 or
6 hours experimenting with ways to improve the performance of my machine. As
I have a full sized Bridgeport (big inertia), and resonance problems as well,
my case is a tough one. We're now debating the next course of action, either
continuing to try perfecting the present scheme or going with a whole new
approach. If anyone out there has information on stepper motor drive
algorithms, let us know!

Thanks,
Matt