I've also considered a boroscope, as I see a bunch of carbon frames at work it could serve double duty


I agree with Duan in the design and use of preforms. I've had less then stellar results with the ones I've played with. The silver forms in a plugged drop out have gone well enough. With bronze forms and in small tubes (bridges) things have also gone well. But with the main frame joints I've had a bunch of partial form melts and have found the need to still feed in from the outside, especially with lugs and a must if building up a fillet. I see the main advantage of an internal preform is the confidence in getting full internal fill, not having a main frame joint completely filled.


Duan- Thanks for starting this thread. It's been a while since someone here has posted a build sequence. I think your project will give you a lot of learning and improvement in how you go about building. I've often wondered about taking up Doug Fattic in his offer to stay in the Ukraine for a few months and build the transportation bikes for the SDA outreach. I know I'd get vastly better at some skills and focus. But at 61 years old I'm not sure if I want to live a monk's life while there. Andy