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Chet
12-05-2001, 10:28 AM
In the May/June 2000 issue of Live Steam, Kozo shows a spring index chart in his "Part 6 - Building the New Shay."
The chart shows a line to find an unknown spring index value. Does anyone know the formula for extending that line beyond the chart values?

It is not a straight line so I suspect it must involve an algebraic value.

Any help with expanding the printed chart will be appreciated.

Chet

Thrud
12-05-2001, 10:31 PM
Chet

Write a letter to Neil and ask the author what he is doing.

C. Tate
12-08-2001, 10:57 PM
Chet,

It will require calculus to extend the graph. Try contacting a spring manufacturer.

bdarin
12-09-2001, 12:38 AM
Go to metalwebnews.com. Under the heading "Miscellaneous" is a topic called "How to make springs". It's a long, detailed dissertation on springwinding that may answer all your questions. Check it out.