SEGMENTED TURNING

Segmented bowls are made by gluing segments of wood together into rings, gluing the rings together and then turning. This bowl consists of 7 rings, each ring 3/8" thick and a base that started as a 3" diameter, 3/4" thick block. The final thickness of the base is 3/8".

Here's how it's done:

1. Strips of wood are planed to 3/8", ripped to the appropriate width for each ring and cut into segments on a sled with a fence set to 15 degrees. 2. The segments are glued together to form half rings against a piece of wood that is clamped to a non-porous surface using rubber bands to keep all segments in place and tight while the glue dries.
3. The half rings are sanded flat and then glued together, again using rubber bands as clamps. Attention is paid to the placement of the different colored segments to ensure the desired pattern is attained. 4. All the rings for one bowl are now glued up. Each ring is sanded in a circular motion on a piece of 60 grit paper attached to a non-porous surface to ensure they are totally flat.
5. Here the rings are stacked and marked for position. The dark Sharpie mark on the edge is the alignment mark. 6. The top maple ring is glued to a round wood faceplate that is attached to a cast iron faceplate. A piece of Kraft paper is glued to the faceplate and the ring is glued to the Kraft paper. This makes separation easier.
7. The rings are glued up separately in the shop-made press. Each ring must be in the press for at least 30 minutes. 8. Here, the top 6 rings are in the press. Note the offset of each ring. The glue joints must be staggered for strength.
9. The bottom ring and the base are glued on while the bowl is on the lathe since they are solid and will not accommodate the long screw in the press. 10. Another view of the glued-up rings. The recess in the walnut base is used to align the base with the rings using a cup live center on the tail stock. Now the turning begins.
11. The outside has been turned, sanded and burnished, and a 3/8" by 2-1/4" tenon has been turned on the walnut base. 12. The faceplate has been separated from the bowl and a four-jaw chuck grasps the tenon on the base so the inside can be turned. Still, no finish has been applied at this stage.
13. This is what it looks like after removing the faceplate. Remnants of the Kraft paper are obvious. First step is to remove the Kraft paper residue and the glue from the rim, then finish turning the rim round on the outside.
14. The inside of the bowl is about 3/4 finished here. The shavings come off in long, thin curly strands that tangle together. This mess can almost be picked up as one big shaving.
15. Once the inside has been turned and sanded the finish is applied inside and out, as far as can safely be applied on the outside without running knuckles into the chuck. Then the bowl is turned around and chucked into the big jaws. The final step is to turn off the tenon on the base, sand the bottom of the base and apply finish. All done!
copyright 2009 Jon T. Hutchinson | 386-717-2542 | 386-736-4053 | jonhutch at cfl.rr.com | FURNITURE | CLOCKS | BOXES | MISC | TURNINGS