|Project by TheDane||posted 03-10-2013 04:12 PM||2191 views||6 times favorited||12 comments|
I have been struggling with getting the alignment of rings in segmented bowls. Being a fraction of an inch off on a ring … especially the bottom rings … can ruin a bowl, wasting wood, glue, and a lot of time.
One of the turners in my local club gave me a tip that really paid off.
He suggested super-gluing four little blocks around each ring to aid in alignment.
With the last/top ring flat on the bench, stack the next to the last ring on it, and center with a combination square.
Next, use CA/super glue to glue 4 little scraps of wood (I cut 1/4” plywood into squares) around the ring (being careful not to super glue the rings themselves together). The plywood squares are used to repeat the alignment when the glue goes on.
Place another ring on top of the stack and repeat. When all rings have been prepped, use a Sharpie to put a witness mark on the rings, then unstack and start gluing. I have a simple jig (a piece of plywood with a hole that fits the back of a face plate and 2 clamps) that I use to put clamping pressure on the stack. I let the glued up stack cure overnight.
When you are turning, the plywood squares will come flying off when you hit them with the gouge, but, so what? You have you face mask on (don’t you?)!
This particular bowl has 85 pieces … a solid maple disk in the bottom, and 7 rings (oak and maple) with 12 segments to a ring. It is 9 1/2” in diameter, and 2 1/4” high. The walls are 1/8” thick, so this bowl doesn’t weigh very much. I glued the bottom disk directly to a waste block that is in turn screwed onto a face plate.
-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"