replace the electric motor of an air compressor with modified bicycle drivetrain. pedal. keep pedalling...
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Step 1: Get Rid of the Motor.
use the existing motor mount to install an axle with one fixed cog and a belt pulley. You'll need bearings. try a 1/2" axle with radial ball bearing cartridges. make the bearing housing out of a slotted tube that has a drilled out nut and a regular nut to allow a bolt to tighten the tube around the bearing. (should i include more desciption?)