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I understand what you said. Now you need to show the math to prove that your method works. A verbal description of what you intend to do isn't enou...

I'll be looking forward to your demolition of a proof that's survived for 184 years. Be sure to publish it here for all to see.
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The statement is "trisection of an angle USING ONLY STRAIGHTEDGE AND COMPASS is not possible", not "trisection of an angle is not possible"....
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I'm not using it as a work surface per se, rather a place to temporarily hold stuff cluttering the main work surface.
The cabinet must be...
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Yes, rollouts are great. Years ago Sears sold rolling tool cabinets that were absurdly low; they looked like something one might find in a shop where...
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Here you go...a page from Whitehead and Russel's Principia...
https://quod.lib.umich.edu/cgi/t/tex...mhistmath&cc=u...
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All measurements in the real world are approximations. The length of the circumference in the world of math is a concept, not a measurement.
...
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One of the most intriguing questions mathematicians (and many physicists) proffer goes something like this...
Is mathematics some sort of...
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Seems to me that these level calibration screws provide a perfect opportunity for the use of a compound thread....
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[QUOTE=darryl;n1928764]... Perhaps the result was so close that for all intents and purposes is was good enough? ...[QUOTE]
"Close enough"...
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A true septagon can NOT be constructed with only dividers and straightedge. Gauss proved that a long time ago; the article I wrote below describes his...Last edited by mklotz; 02172021, 12:39 PM.
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Probably the best practical two gear pair for a ratio of 1.27 is 80/63 with an error of 0.0125% as this table shows...
Desired ratio = 1.27...Last edited by mklotz; 02142021, 11:31 AM.
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So far in this thread I haven't seen anyone describe any home shop method for measuring the alignment accuracy of a rotary table. Slapping a vernier...
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It would be instructive if all the people who built something IN THEIR HOME SHOPS that required sub arcminute machining accuracy would chime in and briefly...
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There are many ways to build it so I'll just try to outline the principle which can then be mechanically implemented in a number of ways.
...
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6 * tan (7/60) = 0.0122... is the radial difference. Multiply that by 2 to get the diameter difference and you have 0.0244... which is very close to ...Last edited by mklotz; 02122021, 04:41 PM.
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Too right. There are 21600 arcminutes in a circle. If you think you can obtain meaningful, repeatable subdivisions of an arcminute with a DIY mechanical...
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With a 90:1 worm gear, one rotation of the crank will move the table 360/90 = 4 degrees.
Provide 4 divisions on the crank disk for 4 degrees....
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More on Anders Malmberg...
http://www.modvid.com.au/html/body_anders_malmberg.html
Here's another approach to simulating reality...
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