38/ and we can then align a straightedge along this angle and wrap it, and then we get a constant thread. Now it's a "simple" matter of
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Replying to @MorlockP
39/ building some sort of pantograph machine which can take these angles and straight edges off references and apply to spinning workpiece
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Replying to @MorlockP
40/ which is actually a tricky bit of design and machining, and will add inherent errors to output...but it is, in principle, doiable
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Replying to @MorlockP
Once you make two threads, you can average them to make the third higher precision. IIRC Da Vinci designed a machine for that.
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Replying to @Octapode
so averaging is a powerful technique. I was reading up on Whippletrees the other night in bed https://en.wikipedia.org/wiki/Whippletree_(mechanism) … bc I had a thought
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re some firewood sheds I want to build. Don't want to do the work of putting in footings (also, don't want to pay taxes on permanent struct
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had just watched a video where a guy built a platform for his machine room granite surface plate that was supported at 4 - but kinda 3 - pts
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note that something similar is done w train bogies for long loadspic.twitter.com/cON40J8vt7
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...so I've been thinking about how to support a fixed monolithic roof on a bed of 4-8 bases that suffer frost heaves.
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but anyway, averaging can ALSO help w precision. This is all fascinating.
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