Subject:
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Re: Shay Chassis (Uni Joint Mods for Trains)
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Newsgroups:
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lugnet.technic, lugnet.trains
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Date:
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Tue, 11 May 2004 19:12:35 GMT
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Viewed:
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2634 times
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> The 9V motor wheel flanges are quite soft to the touch - softer metal than • the
> track. Coating a couple of BBB wheels in conductive paint might work, but
> they'd melt if you applied molten metal. I saw single motor wheels • advertised
> on Bricklink, but we really need the pickup wheels to also be the driving
> wheels.
Maybe a plaster mold could be made to pour liquid metal into. I was
actually thinking someone with a milling machine could step in for the
challenge of producing a metal one.
> You could do worse than using a 3482 wheel hub with tin-foil stuck on it • and a
> contact resting on the top! That's no worse than using sellotape as an
> insulator between 9V track pieces to create isolating sections - it • actually
> avoids a mod! However, we're getting too close to the problems railway
> modellers have with pickups and tolerances on metal parts.
I have a roll of that tape just for that reason although I never finished
it.
> I say motor(s) because you'll probably need two, due to the reduced torque • per
> motor at low speed and the fact that a lot of our 9V locos have two train
> motors, due to the power required. Ideally the Shay would move at a • similar
> speed to a train motor at a given voltage, and would normally operate on • 1st
> notch on a 9V controller (20mph or so).
You might get away with one motor if you go with the newer motor from the RC
car line. These cars are CHEAP at Radio Shack right now. Very torquey...
> Another problem is traction though. The 9V train motor has rubber tyres • and BBB
> wheels don't. You could apply a rubber coating of some kind as long as • you can
> do it evenly (whilst rotating the wheel?) and without damaging the • plastic. I
> wonder if bicycle puncture repair rubber solution would work? Does anyone • know
> if it would damage the plastic?
Cut a groove in some of Ben's wheels to accept an o-ring or rubber band
similar as the the style of the current traction wheel.
-bm
www.brickmodder.net
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Message is in Reply To:
 | | Re: Shay Chassis (Uni Joint Mods for Trains)
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| (...) I experimented with using paper fasteners as pickups with the 12V railway a few years ago. I wrapped each one round a toggle joint and rested it on the conductor rails. This would probably be a bad idea for 9V track as scratching it would wear (...) (20 years ago, 11-May-04, to lugnet.technic, lugnet.trains)
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