Re: Hard Drive Motors, RSGs and Stuff

["Ed Phillips" <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Re:  Hard drive motors

	These motors are relatively low powered.  Before getting up any hopes
of running a reasonable size RSG I suggest a simple experiment of merely
trying to spin a smooth disk of the approximate diameter of the proposed
rotor.  If all goes well, fine.

Ed



Tesla list wrote:
> 
> Original poster: "Christopher Boden" <chrisboden-at-hotmail-dot-com>
> 
> If the specs for a typical hard
> >drive are to be believed, these motors are capable of atleast 3600 RPM.
> 
> 3600 is easy, current drives run around 7200 and up, with the fastest SCSI I
> have seen at 10,000RPM.
> 
> You will need 12VDC to run the motor and 5 VDC for the electronics, they are
> VERY touchy to noise and ripple.
> 
> Remember, the plattens are coated with Iron Oxide (that's why they're brown)
> and are conductive. If you're lucky you'll be able to find an old MFM drive
> (like 5MB or so). It will weigh at least 5 pounds and not have the standard
> IDE connector, but a card-edge type instead. These mostly had seperate
> stepper motors instead of the current trend for a card mounted motor with
> the coils mounted on a card (surface mount, kinda) and the drive being
> through a magnet mounted on a shaft.
> 
> If you do a little hunting, try to find an old AS-400 mainframe or something
> similar. They have >100LBS hard drives that take up like 8U rack spaces.
> These drives work on 240VAC and the drive motors will spin happily on 110
> and have there own power supply units. We have tinkered with this idea for a
> while. With one of the large drives it should work. The plattens are about
> 14"dia and have tons of inertial mass. The motors are VERY powerfull and
> maintain a rock-solid RPM and will live just about forever.
> 
> Christopher A. Boden Geek#1
> President / Founder
> The Geek Group
> www.geekgroup-dot-org
> Because the Geek shall inherit the Earth!
> 
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