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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 02-18-07, 07:51 PM   #1
gargiulo.mike
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noob question

how do you form the end of the seat stay (not the end by the drop outs)? thanks!
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Old 02-18-07, 08:54 PM   #2
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Originally Posted by gargiulo.mike
how do you form the end of the seat stay (not the end by the drop outs)? thanks!
This is my favorite way...

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Old 02-18-07, 09:10 PM   #3
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wow, but do you have to cut the tube at an angle or do you bend the tube inwards and shape it?
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Old 02-18-07, 10:36 PM   #4
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There is a shouldered rod bit that looks like that, or you could make it. It gets brazed into the tube end, and then the thingie gets brazed to the seat tube. That's one way anyway.
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Old 02-18-07, 10:48 PM   #5
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Originally Posted by gargiulo.mike
wow, but do you have to cut the tube at an angle or do you bend the tube inwards and shape it?
There are at least a couple of ways to achieve this look. One is to use a belt sander at a shallow angle to the end of the seat stay, then brass-braze a flat steel plate on to the sanded surface. By brass-brazing the cap, it won't come apart when the stay is silver-brazed to the seat lug.

The second way is to braze a manufactured plug to the top of the seat stay. The plugs are already finished with the shape designed in, but have the disadvantage of weighing more than the flat steel plate cap. Cinelli makes plugs of various shapes for different sized seat tubing.

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Old 02-19-07, 09:32 AM   #6
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okay, thanks everyone!
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Old 02-19-07, 01:09 PM   #7
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For light duty frames you can use shot-in stays where the upper end is integrated with the seatpost clamp.
The classic method is good for light-med touring. There was a neat weight saving trick (shown by Peter White if I recall) using a reversed section of tubing (concave-out) cut form a scalloped end rather than a heavy investment cast plug. This example does it without the scalloped shape.
Heavy duty frames often extend the area of braze by using wrap-around plugs.
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