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The head tube and cargo tube have been mitered and are mounted on the front triangle fixture along with the donor frame.
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The head tube and cargo tube have been mitered and are mounted on the front triangle fixture along with the donor frame.

alignment tablebicyclebrazingcargo bikeframe fixtureframe jig

  • This is what I'm keeping from the donor frame.  It is mounted on my front triangle frame fixture.
  • A test head tube/downtube joint mitered and brazed.  I did 3 tests and cut them apart before doing the final joint.  I wanted to make sure that I was getting a good miter and brass penetration here, this joint is going to be heavily loaded.
  • Inside the joint.
  • Mitering on the lathe.  I built a guide for doing this miter, it is a 2.5" cubic block of aluminum with a 1.75" hole in it.  I mount it instead of the toolpost on the lathe.
  • Top view of lathe mitering.
  • The whole lathe in action.
  • The hole saw is just coming through the tube.
  • The cut is made.
  • The miter has been cleaned up a bit with files and the head tube fits nicely.
  • The head tube and cargo tube have been mitered and are mounted on the front triangle fixture along with the donor frame.
  • Head tube/cargo tube junction.
  • Head tube/cargo tube sub assembly.
  • The frame is brazed together.
  • Head tube/cargo tube/downtube junction.  There is a lot going on here.
  • Downtube/BB junction.
  • Cargo tube/seat tube junction.  I added a gusset to spread the load and because my cargo tube was 1mm short and I didn't want to remiter the top tube.
  • Alistair gives the bike a spin.  This cargo box is temporary until I build a rack.
  • From a ride to West Seattle
  • Bike in profile
  • My hacky temporary box.  It is made from muffler clamps and U channel.
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