Join Date: Sep 2008
Bikes: Baum Romano, Colossi xCr, Homemade Bamboo!
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Critique - frame jig design for bamboo project
I've been working on a design for the frame jig that I'm going to be using for my bamboo frame build project.
I'd love to get any comments and feedback you have on my ideas. A mock 56cm frame has been drawn in using pale green (with fork, 43mm rake). Tyres shown are larger than I'll use (700x28 shown, I'll likely have 700x23).
Download the PDF here
Drawn in Adobe Illustrator.
Why I've started this way:
- The basic material will be aluminium sections and sheet, some that we have to hand, some that are easy to purchase. Other materials also chosen for ease of availability (and cost) here.
- minimum of welding
- Ends of key parts (head tube, bottom bracket) held with machined cones that can be moved up and down 10mm threaded rod
- I want to have lots of room to move when I do the hemp/carbon hand wrapped lugs, so the centre-line style of jig chosen so I can work both sides and get my hands around.
- only basic adjustments - 2cm increments for top tube.
- can change rear dropout position by putting in different section.
What is not fully worked out:
- bracing of two main supports. Just simply bolting them to the central L sections won't be strong enough.
- not entirely sure of where to locate a couple of things.