In article . com,
Pete C. wrote:

Hactar wrote:

I was told this might be a good place to ask.

I'm looking for a slipring or commutator to go around the axle to my
wheelchair wheels.
....
Does such a thing exist for a reasonable amount
of money, perhaps in the model-making or robotics communities?

I have an idea about making one (per side) out of a CD-R, some
alternator brushes, and some sheet metal, if a pre-made one can't be
found. I figure I'll put the CD part on the wheel, to keep its angular
momentum down.

I'm afraid you won't find much for off the shelf slip ring assemblies,
and what there are will be $$$$. Give the small amount of power you need
to transmit, I'd consider using a rotary transformer coupling to
transmit the power as AC instead of DC.

What's a rotary transformer? I really need to minimize the "on wheel"
weight; it's especially important not to cause a torque in the wheel.

--
-eben P http://royalty.mine.nu:81
SAGITTARIUS: All your friends are laughing behind your back... kill
them. Take down all those naked pictures of Ernest Borgnine you've
got hanging in your den. -- Weird Al, _Your Horoscope for Today_