Re: [CAD_CAM_EDM_DRO] Second try to send this

In a message dated 11-07-00 21:07:02 Central Daylight Time,
mr.c@... writes:

<< Let me ask you about your experience with the MO-112 motors. You said that
you used Superior Elec. drivers. Do you remember which drives you used? I
have some new Warner drives that are not recommended by Warner for use on
NEMA42 motors even though thgey make more than enough current to do the job.
Others on the list say that running more than one drive will eliminate the
problem. That sounds good to me. I was just curious as to what your setup
used and how it performed. I have the ss2000md7 drives and nema 42
Compumotors with encoders. >>

First, I only built ONE machine with those HUGE motors. It had ONE MO-112
and ONE NEMA-42 (I'm not 100% sure of the numbers,now. It's been 14 years!
the "MO-112" was about 6-7" face x 9" long? Had four long bolts on the
OUTSIDE of the body, to hold the end-castings to the body. The "Nema-42" was
the size next-larger than the MO-92. Yeah! That's right!

Anyway, I had never built drivers for anything larger than 4-amp MO-92's,
and, as this machine went to England, I wanted them to be able to call-up the
local S.E. man and say, "Cheerio, Old Chap! We have a bit of a problem,
'ere!" There was one HUGE box (copper plated steel sheet-metal, I think.
Clear-lacquered?) for the "big one", and it had built-in DC supply (power-in
was 240 VAC, 50 Hz). The one for the Nema-42 was smaller, but I forgot, now,
if it even seemed to have been made in the same nation as the "big one". It
also could be connected to run off either 240 or 120 VAC, 50/60 Hz. So, if
this latter "worked best" only if "not alone", I guess the presence of that
"big one" in the same machine "did it".

They both turned long preloaded (double-nut) ball-screws. 1/2" pitch, 1"
lead (2-start). Did I say that right? Whew. Never again!

Both had "TTL inputs", and I put an HCT "buffer" between the old PET and
those inputs. Seemed to be just fine. You get a 12' long, 1.5" dia. 1" lead
ball-screw spinning with a 7" dia. stepper motor runnin' it, and you have
some "dangerous lookin' hardware" spinnin' in front of you face, I garontee!

But I installed this in England, and was just-about finishing up when the
Challenger blew itself out of the sky. Was on the news on the radios the
boys had goin' in the shop, there. I tested, showed, closed my Jensen case,
and hied unto Houston, and never heard a word from them, again. But a couple
of American colleagues who had visited there saw it, and told me they "spoke
highly of it". Whew.

Questions will have to wait, as I will be abroad (Shut up! I mean in another
land, you pervert!) until the 26th or so.

Jan Rowland, Troll with attitude