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Staves and Segments

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How Big Will It Be?

How Big Will It Be?

To figure out the measurement across the assembled construction, shown as D1 in the Assembled Size illustration, multiply the side length (L) times the inside-diameter factor for the appropriate number of sides from the chart below. This dimension, which is the diameter of the largest circle that can be drawn inside the outline of the glue-up, also represents the diameter of the largest round piece that could be sawn or turned from the assembled ring.

You can calculate the width across the points, shown as D2, by multiplying the side length times the outside-diameter factor.




FACTOR TO FIND DIAMETER
no. of
sides
Diameter
inside (D1) outside (D2)
6 1.73205 2
8 2.41421 2.61313
10 3.07768 3.23607
12 3.73205 3.86370
16 5.02734 5.12583


And if you need to know the diameter of the opening in a ring, shown as D3, just multiply the length of the short edge of the segment (IL) by the appropriate inside-diameter factor.

You can work backwards, too, to find the stave length required to produce a given diameter. In this case, divide the desired diameter by the factor from the chart. To find, for instance, the side length for a hexagon that measures 24" across (D1), divide 24" by the inside-diameter factor (1.73205). Doing this gives us 13.85641", or 13-55/64".


 

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Comments (6)
7528962405
wood-fog wrote:

I like the fact that you are trying to help us, but, for my limited education, I find your method tedious. I was taught that because you are finding the miter angle to cut.finding the corner angle is a waste of time. Just divide the number of sides into 180 degrees (1/2 of the circle)

1/19/2010 10:19:56 AM Report Abuse
louis Hansen wrote:

very useful info Thanks

1/8/2010 08:25:07 PM Report Abuse
pshelp1 wrote:

I DON,T UNDERSTAND THE SEGMENTATIONS ON MY LATHE CHUCK WHAT IS THAT FOR?

1/7/2010 04:38:28 PM Report Abuse
davidmpitts wrote:

The glue-up can be fairly straight forward as well. Just lay all of the staves edge to edge and bevel down. Then tape the edges together so that when you glue them up the tape will act like a hinge. Then use some thick rubber bands or some band clamps to hold it while the glue dries.

1/7/2010 12:54:55 PM Report Abuse
cowanbryan wrote:

I dont have a problem with the angles its the glue up that baffles me

1/7/2010 10:25:01 AM Report Abuse
maurice bedard wrote:

For more information on stave bowl construction you can refer to Wood magazine issue 23. It's loaded with helpful hints and ideas.

1/7/2010 09:58:44 AM Report Abuse

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