Fwd: Jigged vs unjigged Fillet brazing

[Amir Avitzur]

I recently tacked two chainstays to a round (unlugged) bottom bracket. Did it in a jig. I then took the assembly out of the jig for fillet brazing.

The results were not good: one side was way off (widening the dropout spread).

Would it have been better to fillet braze in a jig … or improve my brazing skills (or both)?

Amir Avitzur
R"G Israel

[david levy]

You need to have an axle in the dropouts.  If the miters are tight this should hold alignment within a few mm.

Dave Levy
Ti Cycles Fabrication (Bicycle stuff) 
Cedar Ridge Fabrication (Car stuff) 

15707 NW McNamee Road Portland OR 97231 USA
+1 503-621-9670 

Ti Cycles Facebook  |  Cedar Ridge Facebook

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[Jon Norstog]

Forks and chainstay assemblies definitely braze them up as much as you can in some kind of fixture. Cainstays and seatstays, I put them together, dropouts in their slots and a dummy axle, brazing/welding up the bridges in my Anvil chainstay mitering jig.  Then I put the stay assmblies onto the from triangle in my old HJ "universal" frame jig.  The HJ has kind of limited space for the torch.  I usually have to finish out brazes and welds freehand, but by then everything is pretty much securely in place.

On Sun, Jul 13, 2025 at 7:06 AM Amir Avitzur <walawala...@gmail.com> wrote:

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[tnort...@gmail.com]

I am a real novice but just completed frame #3. It is a touring bike. I had sliding rear dropouts laser cut and used Paragon inserts. When I  did mine I  used a dummy axle set a bit narrower than 135mm and when I  was done. Bingo!

[Eric Keller]

This may just be a matter of distortion. If you finish your fillet on
the outside of the bb, both the bb and stay are going to distort in a
way that makes the stay splay out.
Eric Keller
Boalsburg, Pennsylvania