On Nov 9, 7:15*am, Ralph E Lindberg wrote:
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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I agree with Kevin that WoodturnerPro is an excellent choice for
designing segmented pieces; however, I have always felt that it is
best to do a plan drawing of the expected finished piece. Do this on
grid paper preferable with a 1/4 inch grid, or any grid that will work
with the thickness of wood that you expect to use. I generally used
3/4 inch thick wood; therefore, the 1/4 inch grid works well. Draw
your vessel to size on the grid paper, then starting with the base
draw a horizontal line every 3/4 inch. Now, to be on the safe side,
draw a line for the outside of the piece and for the inside of the
piece. Now, measure the distance between these two lines and add at
least 1/4 inch each side of the vessel walls and draw another line
inside and out. Now at each level, measure the distance between the
inside and outside lines. That should give you a good estimate of the
width of board to cut your segments from at each level. If anything go
on the greatest size. The fewer segments in the rings the more
difficult this is to calculate.
Fred Holder
http://www.morewoodturning.net