Re: Why is the push to such high step rates (Grex and Arc100)?

Hi John,

By the way, that was a great article, I learned a lot from it. The
timing couldn't have been more perfect too as I was in the middle of
doing some motion control code. While I would like to say that I
used the information verbatim, I didn't. I was able to manipulate
the timer to give me exactly what I needed within the range needed.
I still have a bit of courseness in the upper velocities, but those
are in the range of rapids for this application.

The next time I dive into coding motion control again, I am going
directly for that article and down that path.

Chris





--- In CAD_CAM_EDM_DRO@yahoogroups.com, John Dammeyer <johnd@...>
wrote:

>
> Hi Les,
>
> At first glance what you say about generating stepping rates

appears true

> but in fact isn't. There is some jitter on the MACH pulse output

stream but

> not nearly as extreme as you might think. I'm only using 25kHz

maximum with

> the Electronic Leadscrew and a PIC micro controller and I don't do

it that

> way.
>
> You can see how it's done by checking out the article I wrote for

the

> November 2006 Circuit Cellar magazine which has the source code

posted at

> www.circuitcellar.com or on the E-Leadscrew group. The article

explains how

> to get all the frequencies and not just 25kHz, 12.5Khz etc. The

price is

> jitter but not as extreme as you suggest.
>
> John