Re: stepper pulse rate idea

[Paul <paul-at-bdiemc.fslife.co.uk>]

Hi Ray

Apart from some serious concerns about hysteresis around the change over 
point, is it really a problem ?
Even with a period of 20uS, the maximum pulse rate would be 25KHz which is 
more than fast enough for the average Sherline and reasonable for most bench 
mills. For the larger high speed routers etc, the maximum pulse rate 
attainable might be marginal.

A better solution would be to off load the critical pulse rate generation as 
Jon has done with his interface - Trying to attain 300KHz rates on a standard 
x86 computer just isn't going to work. Switching from micro to full stepping 
on the fly during a move is just asking for trouble and also adds extra 
computations to the very code you need to run at high speed.

Perhaps time to switch to Decaf or Earl Grey... :)

Regards, Paul.


On Friday 14 March 2003 12:11 am, Ray Henry wrote:
> 3 - Value ( your chance to vote or express your thoughts)

> 3 - c  Ray needs to reduce his caffeine intake?

-- 

"To err is human...to really f*** things up requires the root password."
>From a collection of quotes at http://www.indigo.org/quotes.html