Re: EMC problems

["Fred Zinsli" <fred-at-shooter.co.nz>]

OK, here we go, after all the support when I got up to check my mail this 
morning, I went back to the site with all the emails to start getting things 
working properly.

I was about 5 minutes into this when it all come to an abrupt end.

The motherboard croaked it big time. Now I have to admit that my problems 
may have come about because of a collapsing motherboard, and not linux/emc.

Now I have a probably more important question. We first built an old Pentium 
90 system with 32Mb RAM, & 2.5Gb HDD.

I now would like to know if Linux/EMC will run on a modern system, ie. Duron, 
Athalon, Thunderbird(sorry, don't go in for Intel chips). The client has 
indicated that he will buy a new M/B, CPU, RAM, Video card combo if we can be 
assured it will run on it. I only ask because I can't find any literature 
that says or implies that the current BDI install will run. And the client is 
somewhat reserved about spending that sort of money should it not function.

So if someone has got a higher end system up and running, we would be very 
interested in your configuration.

Special note:
The client wishes to express his delight, and thanks everyone for there input 
into this.

Many thanks


Fred


-----Original Message-----
From: John Sheahan <jrsheahan-at-optushome.com.au>
To: Multiple recipients of list <emc-at-nist.gov>
Date: Fri, 30 Nov 2001 18:45:14 -0500 (EST)
Subject: Re: EMC problems

> 
> > Fred,
> > 
> > I think you're PERIOD=0.00005 is still way too small. Try something like
> > 0.005 and work your way to shorter period times. Make sure you have the
> > decimal place in there.
> > 
> > - Keith
> 
> Suggested tuning for PERIOD
> 
>  50uS (sorry, do write it as 0.00005) was a number which worked for me
>  on an ancient 150MHz pentium pro for freqmod.o
>  16uS is too fast on that old box, locks, but would probably work fine on
>  any current PC. 
> 
>  If the period is too small, computer will lock up. The timer interrupt
>  service routine does not complete before a new one comes along.
> 
>  If the period is too big, motor control will be less smooth and
>  velocity will be limited, but will run. 
> 
>  So to tune this, 
>   decide which backend (steppermod.o or freqmod.o) you
>  are using, 
>  get it running with a nice safe PERIOD,  (numbers between
>     PERIOD=0.005  and PERIOD=0.00005  appear to work 
>  reduce PERIOD until things lock up, then reboot and
>  double the number that just locks up for best performance.
> 
> can those that know more about this area please correct/improve the 
> above method
> 
> john
> 
>   
> 



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