Tuesday, December 28, 2010
Wouldn't want the head tube to ovalize.
Thursday, December 23, 2010
Wednesday, December 22, 2010
Monday, December 20, 2010
Here is one of Devins Paragon sliders silver brazed to the chainstay. Took me most of the day to get this far. My, pretty much non adjustable, fixture was designed around road bike type geometry and didn't want to accommodate the higher BB and longer chainstays. But enough manipulation and a smashed and cut finger, it works quite well. I used a 45% silver rather than 50% or 56% as it should impart more strength to the joint.
Friday, December 17, 2010
After tacking the front triangle, the alignment check went well. The head tube was perfectly in plane and only 2mm off center. After the quick realignment, the brazing was coming along great until I ran out of gas and had to run down to the welding supply store for fresh tanks. I really need to buy spare tanks. I used the brazing sequence that I learned from Jim Kish and the triangle came out in perfect alignment. I'm doing over sized fillets per Devs request, it's a lot of extra work. The rule of thumb is that the fillet should be 3 times the wall thickness of the tubing. Beyond that it is purely cosmetic. Then I ran out of 80 grit emery cloth and spent considerable time trying to find some locally, but to no avail. So none of the fillets are finished. I will order my usual industrial sized quantity ASAP and work on the rear triangle in the interim.
Wednesday, December 15, 2010
Its been sanded, cleaned, fluxed, reassembled, and remeasured.
Monday, December 13, 2010
Devins 29er front triangle is finally fitted. The brake line bosses and water bottle braze-ons have been silver brazed on. I like to attach them prior to brazing up the triangle to minimize any stress that putting them on afterwards might induce. Also, the vent holes have been drilled. Wedsnesday I will sand and clean the tubes with lacquer thinner and braze it up. Cool.