I started a frame building course at United Bicycle Institute where they teach how to design and fabricate a bicycle using chromoly tubing and brazing . Today I learned how to braze a water bottle boss, miter a tube for a lug, and lug brazing.
The photo shows my first attempt at a lug braze. I cut it in half to look at how well the silver flowed between the joints. Lug brazing is a skill that takes practice. As you can see, I need practice.
The prep work on the lugs and mitering the tube to fit takes a lot of filing and fitting.
I’ll try to post a picture a day of what I made so you can see my progress. At the end of two weeks I’m supposed to end up with a finished frame that I can build up and ride. This is a whole lot of fun.