On Wed, 9 Nov 2011 04:20:23 -0800 (PST), 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

There must be a way to calculate it, but I find it easier to just
measure it off a drawing. There is a picture of my doing this on my
bowl page near the bottom at:

http://ray80538.home.comcast.net/~ra...l/segbowl.html

I do some bowls using a scroll saw to cut the rings. This is more
economical on the wood.

Ray