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Bicycle powered rock tumbler/exerciser Answered

I was wondering if anyone had any ideas for a bicycle powered rock tumbler. Get exercise while watching videos and light tumbling of jewelry or softer stones.

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gemtree (author)2013-10-18

Um, is this the knex forum I posted this in? If so, sorry.
caitlinsdad, Jewelry and softer rocks would not take so long to polish. Plus, whoever was pedalling could do it over a longer period of time. It may make an excellent incentive as well.

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caitlinsdad (author)gemtree2013-10-19

I do have put away those tripod mounts which lifts your rear bike wheel off the ground so you can turn it into a stationary exercise bike and a set of freerollers. It should be simple to attach a shaft to drive directly or with a transmission hub/gears to turn the rock tumbler drum. Or let the cylindrical drum ride on top of the wheel and turn.

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gemtree (author)caitlinsdad2013-10-24

Thank you! I may try that!

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JonnyBGood (author)2013-10-14

I'm not sure you could make this out of knex....

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caitlinsdad (author)2013-10-14

Rock tumbling takes hours of well, tumbling to polish the rocks. There have been some drink blenders rigged up for pedal power though.

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