A note on Frame Design

Being an avid accumulator of bicycles my stable is missing very few categories, the only gaping hole in the collection is where a fixed bike should stand so this is the type of bicycle that I decided to build. At first I thought this to be a good choice for my first frame because on the face of it it is much simpler, a track frame has no rear brake bridge or cable stops which have to be fillet brazed (all the other joints to be brazed are lugged) to the frame but since i purchased the components and started to practice brazing i have actually realised that fillet brazing is very simple, much easier than brazing the lugs. A track frame has a different geometry to a standard road bike, the bottom bracket is higher, the rear axle width is narrower, the seat tube and head tube angles steeper all to facilitate a more agile machine. The problem i now face is that the bottom bracket shells that were available from my supplier are standard for road bikes so i have had to modify mine to get the correct angles which was a slightly daunting procedure as it involves grinding out the lugs, not in itself difficult but if too much is removed the gap between the tube and the lug will be too large for the brazing material to flow via capillary action. I believe that i have now achieved all of this correctly and i have completed cutting and mitering all of the tubes for the front triangle, so from where i started with this:

I have now progressed to this (chainstays have been mitered at the bottom bracket but are not yet cut to length ready to braze on rear drop outs):

The next task is the one that i fear the most, brazing...