Re: So much for an injury free year, lol and SRSG Hard drives

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Christopher Boden by way of Terry Fritz <twftesla-at-qwest-dot-net>" <chrisboden-at-hotmail-dot-com>

>From: "Tesla list" <tesla-at-pupman-dot-com>
>Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><jimlux-at-earthlink-dot-net>
>
>
>
>Tesla list wrote:
> >
> > Original poster: "Christopher Boden by way of Terry Fritz
><twftesla-at-qwest-dot-net>" <chrisboden-at-hotmail-dot-com>
> >
> > The DAY after I sent an email to an MD on the list mentioning how long 
>it's
> > been since I had an injury.......I drop a 30 pound hard drive magnet
> > assembly off the workbench....and directly onto my big toe.
> >
> > Fortunately the swelling forbids me from putting my foot in my mouth ;)
> >

Nice 3 colour bruise today...though now I WALK like a Duck :)


> > Now to the reason I was tinkering wth the drive in the first place.
> >
> > Along with the semi-trailer of AS-400 mainframe we got a few IBM 
>antiques,
> > some of them are hard drives that have 14+" plattens and use SERIOUS
> > belt-driven motors.
> >
> > 1. Are these motors sync?
>
>They may very well be synchronous, but they might also be DC servos.

Nope AC, the power supply is labeled 208-240VAC, though the motor has no 
labelling except a Hi-Pot. I'll test it today at 0-240 VAC with a strobe :)

>Typically drives spin at 1800 or 3600 RPM, which makes sync likely.
>However, old IBM mainframes ran at 315 Hz or something like that (made
>power supplies lighter and cheaper, and since you had to have a motor
>generator type UPS anyway, it didn't cost anything.  I heard that IBM used
>something other than 400Hz so that it would be harder for competitors to
>make "plug compatible" equipment.. Crays used 400 Hz (probably because
>Seymour liked using surplus).
>

(drools).....Cray........ahhhhhhhh I WANT an old Cray-4 for Sigma-6 :)

The T-90 is bigger than my apartment :)


>
> >
> > 2. Thoughs on making a big hard drive into a NICE big SRSG? Or even 
>ASRG?
> >
> > btw, DC motors from old tape drives (the reel to reel kind) make 
>cracking
> > good ASRG motors :)
>
>
>And, excellent robot drive motors, as well.. typically 500-1000 RPM with
>gobs of torque.

Yup yup....I also had another brilliant idea.

Record players :) I've been kicking this around for over a year. I want to 
build a SRSG from a record player. It would have a TON of flying electrodes, 
but it's a very easy, cheap way for people to get stable sync drives :) and 
you could change breakrate easily :)

REALLY old record players would spin MUCH more than the common 33.3 / 45 
RPM. I've seen 16 and 78 as well :)

How about a capstain drive motor from an old reel to reel? They have VERY 
accurate speed lock, and if you get a good studio drive they have a pitch 
adjustment of 10% that would work for phasing :) and reel-to-reels operate 
everywhere from 7.5IPS (Inches per second) to 15 (the most common) to 30 IPS 
(for studio mastering and tracking). That's a FAST little motor when you're 
using a 3/8" shaft to control the speed :) Fast enough for a gap at least :)




>
>
> >
> > duck
> >
> > Christopher A. Boden Geek#1
> > President / C.E.O. / Alpha Geek
> > The Geek Group
> > www.thegeekgroup-dot-org
> > Because the Geek shall inherit the Earth!
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn-dot-com
>
>
>


duck




Christopher A. Boden Geek#1
President / C.E.O. / Alpha Geek
The Geek Group
www.thegeekgroup-dot-org
Because the Geek shall inherit the Earth!


_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn-dot-com