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Good afternoon
I take note of what Covoxer states but I did the example quick and simple to show a diff. method, if the base circle is split finer ie 5 or 10 degrees which would make the example...

OK Xhris
Believe me this will work for anything, I was doing this after 5year apprentaship 40 years or so ago, have used it from small to big and when I say big would a ships funnel do!!
Yes the...

Great formula but need to measure and work out, have a look at attached file, looks a bit complected but is quite simple, have tried to get it layed out on a single sheet, just mark out and draw, not...