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Old 07-17-19, 03:12 PM
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scarlson 
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Bikes: Ron Cooper touring, 1959 Jack Taylor 650b ladyback touring tandem, Vitus 979, Joe Bell painted Claud Butler Dalesman, Colin Laing curved tube tandem, heavily-Dilberted 1982 Trek 6xx, René Herse tandem

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A little something for you koolaid fanatics

I'm making another thing to braze onto my Trek. This one is very high on the BQ koolaid scale.

"Broaching" the subject .... (bad machinist joke right?!)



Ahem. This is a broach. Basically a really hardcore saw or file, for cutting a square hole. You press it through a pre-existing hole and then add a shim. Eventually you come to have a large collection of shims, if you're wanting to square off the ends of a pocket made with a round endmill.

In this case, I'm making this square slot on the diagonal through a piece of stainless steel square bar. Can you guess what I'm making?



Think about what Jan Heine dreams about. Think Rebour drawing. Any guesses?
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