Re: [CAD_CAM_EDM_DRO] Limit and Homing switches

Hi Drew, Jerry, list!

Did you do the home in TurboCNC? I just discovered it! But I don't
have any home switches... yet.

I did observe something. I boot windoz98, just to "DOS", and run both
TurboCNC and my code. I thought that ought to be good enough. I still
had some jitter on my code's pulses that I couldn't explain. Every 20ms
(hard to determine), I see my pulse get very wide. I thought it was
just my code. Then I looked at TurboCNC's pulses. Same problem, maybe
worse! I thought all the "interruptions" were off! I formatted a DOS
boot disk from DOS (windoz98), and ran both programs from DOS, rebooted
from this floppy. Nice and clean (yeah, I should have known that)!
HIMEM.SYS is loaded, DOSKEY, DBLBUF, CRROM stuff, and a few others. I
recall Jerry running into EMM386 causing problems, but I didn't think
these others would be a problem. Now I know! Somewhere there is a
config.sys for the "DOS" boot of '98, but I haven't found it. The
"shop" machine is even more complicated, as it has a LILO boot for EMS,
and can also run '98. Well, at least a floppy boot works.

It's something to see those drives spin at 120+ IPM (8000 spi)!

Alan KM6VV


Drew Rogge wrote:

>
> Yeah, that would probably work for a homing technique where you
> do something like find the home, back off and then find it again.
> The controller would have to be able to reset the F/F and since
> I'm using turbocnc I can add that feature.
>
> Thanks for the idea.
>
> Drew
>
> Alan Marconett KM6VV wrote:
> >
> > Hi Drew,
> >
> > Thanks for the comments. If you can't latch the index until read, then
> > what about a vane or slotted disk, so that you could make the index as
> > wide as needed? Otherwise, no luck!
> >
> > A JK F/F can be used to latch the index, and would be reset after being
> > read.
> >
> > Alan KM6VV