Alt-BEAM Archive

Message #01039



To: dennison dennlill@buffnet.net, beam beam@corp.sgi.com
From: Sean Rigter rigter@cafe.net
Date: Fri, 26 Feb 1999 15:10:50 -0800
Subject: [alt-beam] Re: I may source a few gearmotors.


If these are similar to Omron Mac ejectors, you may find some in
free/lowcost 800K Sony drives in the dumpsters etc. You will also find
inside a nice bipolar stepper, a photo interrupter, 2 tiny micro
switches, easy to use older style SMD resistors (little barrels) and
tiny header connectors for the motors etc. I can recommend the motors
with the following caveat:

No mod is needed but the cam/contact could be used as a limit switch or
index marker. In that case you must rotate the output gear to the right
position before soldering on the legs.

File and roughen the surface of the metal plate on the gear (and the
legs) before soldering. Remember the gear is made of "low melting
point!" nylon. Use some flux, solder quickly and cool off right away by
vigorously blowing on the metal plate. I have also used some 99% isoprop
alcohol for cooling but there is a safety issue with flammability and
fumes so "use at your own risk"! Once the plate becomes loose or falls
off from overheating it is difficult to repair (Anyone?)

> dennison wrote:
>
> I may have struck up a deal in which I may be able to supply a few
> nice gearmotors. The specs are:
>
> About 30 RPM (Perfect!)
> 2.5v-6.5v
> Small size: Around 1.2" x 1.5"
> Low current
>
> It's output gear is a little like the Mac Eject motors, with (I think)
> a small metal plate convient to solder legs to.
>
> Now I have't gotten any of these motors yet, so the deals tentative
> based on how good they actually are to use. If I do decided to make
> the deal and source a few of these motors, I plan to sell them at
> about 11 dollars. The price may go up to twelve depending if I need to
> do a small modification for continuos rotation. When I do know more
> I'll let you guys know, as well as posting a scan of the motor so you
> can see them for yourselves. In the meanwhile if people are interested
> PLEASE let me know and I'll set some aside for you, but as I said,
> the deals tentative.
>
> Dennison

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