On Monday 24 March 2008, Peter C. Wallace wrote:
>> I assume we are talking abut the steppers that drove the head carriage
>> through a strip of about 1 mill stainless steel ribbon about 1/4" wide, or
>> the same size motor but with a long shaft with a spring wire for a half
>> nut? The little ones like in the 3.5" disks aren't ball bearing, and with
>> their 1/8 worm shaft, would not be too rugged a part for shop floor use.
>> The motor I'm thinking of, and I have several in old tandon 5.25 drives
>> and the motor is about 1.75" square by an inch and a half long not
>> counting the shaft. Those are well built.
>
>Yes, thats it, 5 1/4" floppy band positioner steppers. 3 1/2" floppy
> steppers are too wimpy... The 5 1/2" steppers probably also have higher
> output voltage since they originally ran on 12V vs 5V for the 3 1/2" floppy
> drives.
>
I surveyed the drives I've squirreled away over the years, and it seems I have
only one band drive model left with the little square motor. From the feel
of that one, its a 96 tpi drive.
However, I do have a 6 pack of a similarly sized but round motors in some old
MPI full height drives that has the long spiral cut shaft. Motorwise, I
suspect not too much difference electrically, but sawing about 3" off the
shaft might not be too good for the motor. 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. The shaft looks like its
somewhere between 1/4" and 7mm in diameter. I may extract one of those and
see how it works & report back here in a few days, maybe asking for hal setup
help to use it. :)
--
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)
There's nothing remarkable about it. All one has to do is hit the right
keys at the right time and the instrument plays itself.
-- J.S. Bach
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