On Friday 28 March 2008, Ian W. Wright wrote:
>Gene wrote...
>
> >>>>>>>>>>I also don't know about the
>
>bearings, I'd think ball cuz sleeved stuffs usually have more end-play than
>could be tolerated in a spiral groove drive setup.>>>>>>>>>>>>
>
>you might need to look at those motors carefully - some of them only had
> very rudimentary bearings in the front of the motor and relied on a simple
> steel ball sitting in a dimple in both the motor back bearing and at the
> end of the screwed shaft. A lot of the little 3 1/2" floppy disk motors now
> use the same technology. Have you considered using the innards of a mouse
> to make an encoder such as - http://tinyurl.com/3awsou ? A dead computer
> printer will probably give you a couple of usable motors but they are often
> only 48 step.
These have oil-lite sleeve bearings on both ends, I can see them. And they do
seem to be 200 step/rev. I believe my friend has more of them cuz when he
gets an itch, he buys enough surplus of whatever he's going to use to scratch
that itch to last him for his projected production run. That, after 8 or 9
years, is never gonna happen, and I suspect the batch this one was one cell
occupant of an egg crate full of them can be supplanted with however many
more I might need for a 5 dollar bill or less each. Probably a lot less.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
QOTD:
"You want me to put *holes* in my ears and hang things from them?
How... tribal."
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