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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 01-20-10, 03:01 PM   #1
Airburst
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Fillet Brazing- how big should fillets be?

Roughly how big do the brass fillets need to be on a typical fillet-brazed bike? I'm probably going to use brass, does that make a difference?

Apologies if these are dumb questions

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Old 01-20-10, 03:30 PM   #2
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Use brass or bronze brazing rod as in this Dave Kirk frame:



Generally speaking, the radius of the fillet should be about four times the tubing wall thickness. Sorry, but I don't know the source of this drawing:

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Old 01-20-10, 07:29 PM   #3
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Keep in mind that the fillet depth is much affected by the angle of the joint, both in terms of tubing geometry angles, and the side of the tube in question, the flats allowing little depth. So your eye can be your guide as much as anything else. Nothing that is forbidding you from doing some destructo tests, not that those loads are the main failure mode, but at least you know you have some basic result.
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