Re: [CAD_CAM_EDM_DRO] Re: Having problems with Lindsay design DRO... Could you please help?

This thread just brought up a point that I forgot! You HAVE to boot to
DOS to run this program, Even if you try to run it in a DOS prompt from
windows, you will have the problems mentioned! Windows has to much
overhead. If you run "port speed" program in Steves ensemble, you will see
what I mean.

At 12:52 AM 5/5/01, you wrote:

> > Well, I'm still stuck.
> > I have adjusted the "Time" setting and it got a little better, but it
> > still has alot of errors. If I go VERY slow, it will work fine, but
> > that kinda defeats the purpose of the DRO.
> > I have checked all the items mentioned, and they appear to be correct.
> > I am using an old Compaq pentium 75 MHz PC.
> > Could it be the cable between the black box and the computer?
> > It doesn't appear to be damaged, but could this be the problem?
> > I think a new cable will cost about $15. Should I just cut my losses
> > and buy the pre-wired board from Camtronics and use the Kulaga
> > software? (I really don't want to put $85 more into this if I don't
> > have to.)
>
>Buy the kit or build it yourself - it's not a complicated circuit - I
>built it up on an old prototype card in an evening, although I'll
>probably spring for an etched board at some point to make it more
>robust. The main point is that the circuit uses a $25 chip to handle
>all the time critical pulse-counting tasks, wheras a software based
>counter can loose pulses if the processor's time isn't properly
>prioritized between its numerous tasks. That is a requirement that is
>hard to achieve with everything going on in a modern PC, and darn near
>impossible once you add the overhead of something like windows or
>linux (your only safe choice is a realtime extension, like EMC uses).
>
>Go with the hardware solution - some better wire probably wouldn't
>hurt, but if your leads are moderately short and you get errors even
>with your machine's spindle motor off, chances are it's timing not
>noise.
>
>Chris
>
>--
>Christopher C. Stratton, stratton@...
>Instrument Maker, Horn Player & Engineer
>22 Adrian Street, Somerville, MA 02143
>http://www.mdc.net/~stratton
>NEW PHONE NUMBER: (617) 628-1062 home, 253-2606 MIT
>
>
>
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Bubba

OLDER THAN DIRT
Country Bubba
(Actually the inventor of Country and Bubba)

axtein@...
LaGrange, GA

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