Re: [ATM] How to Reduce Bearing Friction EQ version

[Kevin MIchael Zabbo <chaosopher23@yahoo.com>]

The 1/4" shafts against the rim are intended to
produce a lot of friction.  The bearings that the
shafts occupy are isolated from the rim, where
friction is not the issue.  Metal vs. metal is the
idea here.

Skateboard wheels are generally of a softish, rubbery
urethane.  Everything is rubber at 600x, and
skateboard wheels would be like tidal waves.  Metal
vs. metal, in this case, would be ideal.  As much of
the mount as possible will be constructed of metal.  I
am seeking a piece of aluminum U-channel for the RA
frame, but if I can't find that a few pieces of 1"
square tube will do.  Rigidity where it counts.

Kevin

--- Nils Olof Carlin <nilsolof.carlin@telia.com>
wrote:

> Kevin,
> 
> Intuitively, I'd think that the 1/4" wheel against
> the metal rim would mean 
> friction problems. What about 2 skateboard wheels,
> one idling and the other 
> driven by that 1/4" wheel?
> 
> Nils Olof
> 
> > My EQ platform will have, as its north pole axis,
> a
> > bicycle rim devoid of its innards and tire,
> contacting
> > on two bearings at about 100 degrees apart.  One
> of
> > these contact points is a driven wheel and the
> other
> > is an idler.  The driven wheel is smallish, about
> a
> > quarter of an inch in diameter and is coupled to a
> > stepper motor via small gears.  This will take the
> > load from the little motor.  The idler is going to
> be
> > taken from a skateboard or roller skate that's
> still
> > in good shape, or maybe the front hub of the
> bicycle
> > rim that is now the north pole of an EQ mount.
> 
> 
> 
> 


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