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CAD (Cardboard Aided Design) layout of 12 inch wheeled small recumbent. Yellow lines show the chain line. You can also see the Center of Gravity (app...
Donor bike frame (black) positioned showing where Bottom Bracket (BB) will be near cardboard foot. Only the black BB and downtube will be used in the ...
Prepare to drill the Head-tube* sized whole that will be the miter (sophisticated, snug joint where two objects join at an angle). The boom is positi...
With miter holes sawn, I cut away some of the black boom tube while leaving some reinforcing "wings" for welding to the head tube.
File and shape the wings. The wings add joint strength and they help spread the pedal force from the boom to the frame.
Layout the boom and frame on CAD to look at Chain-lines (shown here with Yellow battens) Also look for leg extension and possible heel to wheel inte...
Scrape or sand the paint off of the area to be welded. Mitered boom is dry-fit onto the pink head tube and strapped in place with a big clamp or cargo...
Make a few small tack welds to hold the pieces together. I use a MIG [Metal Inert Gas] flux core wire feeding welder. It's pretty easy. Just prete...
Now to grapple with the chain line on the slack side. (It rubs against the fork blade. And if I lift it, it rubs against the chain-stay.) The tight s...
I like an efficient quiet straight chain run especially on the tight power run of chain (the top length of chain pulled by the cranks and chain wheel)...
Time for Test-Ride-Fun!. Hybrid of the littlest pink princess with the big bad mountain bike down-tube welded to its head-tube looking like a little ...
OK, It rides well for me, but to accommodate my smaller fans at Maker Faire, I'm building a long seat so shorter legged kids can also ride it by simpl...
A salvaged office chair plywood seat pan has its cover peeled back to expose the foam padding. Pencil lines outside the mounting bolt holes show where...
It worked, but it felt a bit wobbly so the next step shows a new seat brace added.
Seat brace bolted to frame and screwed to seat structure, prevents wobble. Adjustable seat back (upright for long legged riders, scooted forward for ...
My neighbors enjoy the ride. This bike turns on a dime. Come test out the bike at SF Bay Area Maker Faire 2011. My next project is a similar bike b...
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Apr 26, 2011
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