Given this list is a pretty diverse bunch of surplus prowlers, I am wondering if anybody knows where I can find a couple super low inertia motors like some older tape drives and other very rapid positioning equipment used. They are easy to spot once you have seen one, imagine a super large sams club sized tuna can (say 4" tall x 7" dia) with a single portion fruit can on top and shafts sticking out the top and bottom. A couple big knobs for brushes etc. and if you touch the shaft it turns like nothing is there, very low inertia. Here is a picture, and you can even see the two in the middle still have some sort of tape drive capstan thing I think. <http://www.mindspring.com/~sdinc/pages/contra_p22.html> You can see they vary from pricey at C&H (which is the only place I am finding any in stock) to $5 or $10 at most swapmeets, and around $25 at cheaper surplus joints. Still much cheaper than the new price around $600. What I need is one, maybe two if the price is good and they meet these specs; Motor Moment of Inertia (Jm) = 0.0007 to 0.0009 oz/inch sec^2 Torque constant (Kt) = 9 oz/inch per Ampere (for 1 Ohm motor, ie. Rdc = 1 Ohm) Torque constant (Kt) = 14 oz/inch per Ampere (for 2 Ohm motor, ie. Rdc = 2 Ohm) Drive shaft = 3/8 in. (diameter) "Figure of Merit" (FoM) = Kt/(Square root of Rdc) = 9.9 oz-in of torque per watt disipation Any of the following should do, but I would prefer a 4VM82 due to higher heat rating. Pacific Scientific 4VM62 XXX 4VM82 XXX Yaskawa S-12-B Electro-Craft M-1140 The XXX just means the numbers don't matter. I had a 33VM62 that was brand new in my hands at TRW swapmeet, but haggling fell through at $7, and good that it did as that one has too low torque. For the curious this is to be used as the drive motor in a Contrabass subwoofer. I do have some real plans to play with one as a computer controlled positioning system. Sorry if its too off topic for some, but it is an old computer motor.

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On Tue, 29 Oct 2002, Mike Ford wrote: Contact the ACCRC. They get old tapes drives in once in a while that nobody wants to claim and the unit simply gets scrapped. However, the motors are usually culled because once in a while someone comes in looking for one for this project or another. The last guy that came in looking for one was building a submersible hydrogen vehicle (something like that). Another guy a while back was building windmills for electricity generation. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

--- vance(a)neurotica.com wrote: Hey! They aren't wierd - they are an ISA machine (one slot) with built-in video, a 2.5" hard disk, laptop-floppy and a max of 16MB of RAM. IBM shipped them in three flavors based on what they stuffed into the lone ISA slot - Ethernet, TokenRing and PCMCIA. I have a couple of them. I put Linux (RedHat 5.2) on an 800MB disk and stuck 4 3Com 3C589s in it as a router for several low-volume DMZs (test LAN for (previous) work to pseudo-simulate the production network environment for product development). Worked fine, presuming your definition of fine includes sub-33MHz 486-grade processors and a textual OS. :-) I'd love to get the LCD screen for it, but that costs several times what the CPU does. ISTR mine were $15 or so at the Uni Surplus two years ago (minus the PCMCIA cards which I gathered from a couple of sources - thanks again, Bob!). -ethan __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/