Re: [CAD_CAM_EDM_DRO] Re: faster steppers

Ballendo, Ian & List,

I know that the chipset is sensitive to boardlayout and other stuff. These
drives are actually my first 'real' drives ever. (designing as well as
using) So I don't have much (anything) to compare with.
The reason I wrote what I did was that I _think_ Ian is using my schematics
and boardlayout for his drives..... Ian?
So if Ian IS using the design I sent him he should be able to compare the
results, at least to some extendt.

I also sent those files to you Ballendo as well as about 10 other members on
this list (on request, of course). I belive only 2-3 of them commented the
design, both good's and bad's. I was hoping for a little more feedback from
people that may have other drives to compare with so that I could learn what
I did right/wrong 'till next time.
One, perhaps, bad thing about the drives is that it's a single sided board
and therefor a lot (25) jumper-wires on the componentside. It makes the
board easy to etch at home, but doesn't make that proffesional look that
doublesided boards w/ soldermask etc does.
So, Ballendo, I can't really tell If I'm good or bad ;-)) Take a look at
the files, if you want, and tell me what you think!?

Ian,
I'm glad to hear you got that speed up! I didn't think of the software-side
of the problem. If you have a functiongenerator or pulsegenerator you can
connect that and see if you can go even faster. I have noticed, when running
the motors with my functiongenerator, that it makes alot of difference how
fast I 'accelarate' - to fast OR to slow makes the motor stall. So I can't
say I can run 10000 half-steps/sec reliable. As you can tell I'm FAR from a
semi-pro when it comes to steppers and there drives but atleast I got it
running and keep on learning every day.
Good luck!!

/Henrik Olsson.

Oh..if anybody else is interested in the design I'll be glad to share.

> Henrik, List,
> Although the 297/298 chips are ubiquitous(everywhere), the drivers
> made with them are NOT ALL the same. This chip set responds well to
> good design and layout, and PUNISHES poor layout/design! So,
> comparing different mfrs. 297/298 bds is not often apples/apples...
> Hope this helps.
> Ballendo
> P.S. So Henrik, if those ARE 297/298 boards, you must be pretty
> good :-)