New life for a worn drive roller

I don't have any pics of the current configurations whiich have evolved from
this earlier prototype pictured. the shown setup worked pretty well with spds
to 33mph, but didn't have as much low end as I'd like for the trailer. The sheave
here is from a 20" wheel. This bike now has the sheave from a 24" whl, a more
precisely aligned Staton fric channel, and an HS 142 with 1 gal tank.
Even though I got the roller to work pretty well, it's just too wet here for
friction to be practical. Rollers either get coated with oily exhaust residue
or clogged up with muck.
 

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That's cool.

The Dax friction drive is drilled and slotted on both sides, so the engine can be reversed, in case you want front wheel drive or create something else.

The drive shaft is welded on the clutch bell. I think it's really strong that way. It's not long enough to mount anything (pulleys etc) outside the drive channel, but it's likely that the front bracket can be widened and washers used, or another bracket made, to compensate.

I like LowRacer's idea of using a duplicate rim (or narrower rim) welded, or riveted and bonded, to the tire rim, as a large almost 1:1 pulley.

Here's how I got a 1 gallon tank on my FD. This came out really well
picture.php
 
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Yup,
It was low racer put me onto the trying a 24'' whl's rim for a sheave. It
really has worked out quite well. I didn't lose much top end, and it definitely
delivers more torque to the wheel. I'm pedaling a little more, but with less
effort on steep grades.
If you did want to extend a shaft past the channel, it's not all that hard.
just grind down a 5/8'' bolt and thread the end to 3/8'' 24 thread for the
clutch bell. My pulleys were already 5/8'' i.d. so I could just bolt them onto
the threaded end of the bolt.
 
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I think the one I have is welded. Cool idea though. If someone had a shaft extending past the drive channel, they could mount a magnet to it, and mount a coil and arm to the channel, to make a 12v lighting system. It would have the issue that it only operated while moving, but could also perhaps charge a 12v battery. I think it would be a good aftermarket part for someone to produce.

My dax kit has the shaft going out of the other side of the channel by just long enough to fit a locking collar and snap ring. Perhaps instead of the locking collar, it could fit there.
 
Or...you could just buy a generator, not as much fun tho. The great thing about
have the shaft extend outboard instead of having the pulley inside is that
swapping out pulleys to a higher or lower ratio is a breeze. It's so much simpler
than changing rollers on friction.
 
Oops, by the way, FYI, I neglected to mention that i cut a flat-faced
notch into both sides of the shaft so I can grip it with a cresent wrench
while twisting the nut on or off.
 
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