I have been turning bowls for a number of years and have started to do segmented bowls. My problem is with the alignment of the segmented rings. How do you keep the rings from moving while doing a glue up? It would be nice to keep them perfectly aligned so that I could us less wood whem making the rings. I now make them on the large size to offset the misaligment if it happens.
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How about . . .
. . . exterior and interior forms to hold the lateral/horizontal alignment? The exterior could be a series of straight pieces (4 or 5) that could be adjusted to the desired angle. Attach the bases to T-track, and it becomes pretty versatile. The interior piece(s) would probably need to be more specific to the shape of the bowl. Depending on how you are clamping the assembly, I could see various approaches.
Keeping segments alligned
For each layer, make a center disc of particle board with a precisely located center hole. Wax the outer portion to prevent glue sticking to it. Place a dowel through the center of the discs as you stack them. Or if you were to use a threaded steel rod instead of the dowel, you could then use that for clamping the whole stack together by adding some appropriately sized disc to the top and bottom of the stack. Might be able to get away with using styrofoam instead of particle board for the discs.
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