In article
14432775.1164.1320841223959.JavaMail.geo-discussion-forums@yqni5,
jtpryan wrote:

In all the woodturning plans I see there is a column for board width. For
example:

http://www.segmentedturning.com/imag...hemisphere.gif

How is this figured? I know how to figure angle based on number of segments
and length of segment based on circumference. But I don't know how to figure
the width of the board used for each ring so that I don't end up with too
thin a spot once glued up. Is this figured from just drawing it up or is
there a math component? I want to just put together a spreadsheet for this
rather then buy software to do it.

Thanks,
Jim

Math. Number of segments and external diameter used to calculate cord
length, which is the length of the segment

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