RE: [CAD_CAM_EDM_DRO] sorting these motors out

I'd suggest carraige motors out of BIG OLD Dot Matrix printers
(IBM Proprinter /APPLE Imagewriter etc) these are typically nema23


Usually, you'll be able to pilfer the drive transistors and maybe
powersupply
from the printer too... (maybe just remove the controller chip and add
wires from
the parallel connector to the drive circuit??)

These are typically unipolar 5V@1A type ratings (around 50Oz motors?)
probably driven via chopping driver of around 30V

the printers also have linear bearings you may make use of...





-----Original Message-----
From: Roy J. Tellason [mailto:rtellason@...]
Sent: Saturday, January 31, 2004 1:44 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] sorting these motors out


I see lots of posts in the various CNC-oriented groups about people with
some
pretty heavy-duty setups spending some really astounding amounts of
money on
stuff... Not me! I'm a scrounger, been that way since way back
when.

Anyhow, I've got an assortment of motors here and am wondering what
might be
useful in terms of the machine I hope to build somewhere not too far
off.
This is gonna be a small one (I'm still in a second floor apartment) and
will
probably see most use for milling/drilling circuit boards.

These motors came out of old floppy drives, printers, and similar
stuff.
Some are fairly plainly marked as to what they are, winding resistance,

current, etc. while others aren't. Is there some easy way to track down

specs on some of these that are only marked with model numbers? Many
are
Japanese makes, for whatever that's worth. Or is there stuff out there
on
the web that would make this chore easier?

I see fairly common references to specific motor sizes in terms of a
NEMA
number, but have yet been able to nail that down to anything in
particular
regarding size. My one attempt at the NEMA web site wasn't all that
successful. Is that info out there anywhere else?

I have some motors here that were for floppy spindles, one direct drive
(I
don't usually salvage those too often) but most were belt-driven, don't
know
what I'm going to do with those as the RPMs would probably be on the low
side
for much of anything useful. I also have several that were pulled out
of
3.5" floppies, and these are equipped with screw-type shafts and are
apparently okay for only a limited travel. Suggestions as to what to do
with
these would be welcomed as well.

My thinking is that the least ones that are probably going to be useful
are
the ones that came out of 5.25" drives, either the roughly cubical ones
or
the "pancake" style ones, which were both used the same way with a
band-type
head positioner and probably have roughly comparable torque.

Then there are some others here, that I'm not all that sure about. I
*think*
these came out of old daisywheel printers, and they don't look like
steppers, but in many cases appear to be equipped with optical
interrupters
at the back end of the shaft, in one case under a plastic cover
(labeled
"Warner" and "Rated 1 AMP" and "Resistance/phase 20 ohms" but not much
else)
or there's a small circuit board on the back end of the motor with a
separate
cable coming off it than the one that provides the motor drive power and
an
optical interrupter disc is visible attached to the motor shaft. A
couple of
these are pretty substantial compared to the rest of the pile, maybe 2,

2-1/2 inches in diameter and 3-1/2 - 4 inches in overall length. Most
of the
rest of this stuff is significantly smaller.

Any help on finding any useful info on these, or suggestions as to what
some
of them (the drive spindle moters in particilar) might be used for would
be
appreciated.



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