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 ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users