Doing Things Wrong

Brazing

Brazed double-acting truss rod

Brazing is essentially the same process as soldering. Two metal pieces are joined using a third metal with a melting point well below either of them. Brazing is useful for joining metals that cannot be welded, as well as dissimilar metals.

Brazing is also useful for joining heat-treated steels that would be ruined by welding. This was once paramount in bicycle frame construction, before cheap automated aluminum welding took over the market.

Finally, brazing is useful because you can do it with just a common propane torch. See my pages on truss rods for some designs you can build yourself from common hardware.


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A subject so simple you hardly even consider it, yet really very mysterious. Just what is the roughness of sandpaper, and the relation to the number on the package?

Here's a plot of some numbers I found online: sandpaper "grit" versus actual micron size. Interesting to see what size scratches you are taking out ( or putting in. ) The curve starts at 320, which is the coarsest grit that might be considered part of the finishing process. For final finishing like orange-peel removal, I start with 1500 and work up from there, I find that even 1000 leaves scratches that are difficult to remove.

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