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I wanted create a for a long time bike with gear box in the bottom bracket as I Expanded a rim rear hub and built a custom coaster, ...
First I made plans and gear ratio Plans were made to the scale to facilitate manufacturing and various tests of setting up
the system consists of a shaft on which a gear is driven all the time and the two other turn in the blank when you change the speed ...
then, and still brass, I machined "sliding" it slides on the shaft and causes a finger, which thanks to a spring, causes the pinion that is desired, while ...
Then I set up a temporary Chassis mechanism to try ... - Bottom 4 sprockets rotate at the same time - Right there the output gear (the piece ...
manufacture of the box to receive the mechanism I asked a friends to machine the bearing location for the rest I did everything by hand, with a hole ...
tedious but important step, polishing! I used several grade sand paper: 100, 240, 400, 800, 1000, 2500 and 4000 then polish has is sufficient vehicle body This is ...
I was missing 6 mm in order to close the box properly .... So I used orange plexiglass to fill this gap orange ... why? because I love ...
for the selector, I used pieces of brass I brazed silver a small plexiglass cover can make a little more sealed all here is general aspect
the spring of the cable not being effective, I made another system better finish to tighten the cable here is the new system
remains only to mount the gearbox on my bike homemade I do no more details than that the bike because for me the main subject is the gearbox! ...
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