I wanted to go back and post the build of my first bike I built. This bike was built at UBI (the United Bicycle Institute) located in Ashland Oregon.
The first thing we did at class on our actual bikes was draw by hand a full scale drawing of the bike frame we wanted. The instructors were great at explaining the process and the different factors we need to take into account for our individual bikes. The bike I built was a 29er that needed to accommodate a Fox 100mm fork. The biggest issue I ran into was trying to fit the fork so that the caps would not hit the frame when turned a full 90 degrees. After the frame had been designed we moved on to cutting, mitring and brass brazing the sub-assemblies that were going to be latter put on the frame.
The first sub-assembly was the rear dropouts / Chain-Stays(CS). After picking the correct dropouts and CS for the application (in my case I used the paragon dropouts with built in disc mounts and a set of s-bend chain stays) we slotted the CS and modified the dropouts so the two formed a snug joint. Once they were slotted to the correct angle they were put in the jig and brazed in place.
The next sub-assembly was the Seat-Tube (ST) / Bottom Bracket (BB) shell . Once the correct ST had been chosen, in this case an externally butted ST, it was measured to the internal and external butts were in the correct place and then mitred to form a tight fit to the BB shell. The next step involved drilling vent holes in the BB shell where the ST intersects it. This is to allow off gasses from the brazing process to escape instead of building up in the tube. Also these vent holes also allow water to escape from the tubes that WILL eventually build up, especially around the ST and Down Tube (DT). After checking the squareness of the mitre and then prepping both tubes the BB shell was then mitred to the ST.
I think that is going to be it for now, the next part will be soon!