Here's a simple bending jig I made for the curved sides of a lap dulcimer. Pine lath about 2/25" wide and 1/4" thick was used for the bent sides.
I drew the outside curve I needed onto the wood base, then measured in 1/4" to draw the inside curve.
Pieces of wood are strategically glued along the curve to hold the wood in place while it dries.
The pine lath has to be dampened (you can soak it overnight in a plastic bag) and then gently bent with the hands to form the basic curve. Then it's inserted into the jig and left to dry for a day or so. It came out perfect! I made two and flipped one over to make the symmetrical sides.
A couple of things I discovered when I built my second jig - it was designed for circular curves, and they seem to exert more pressure and are a lot harder to wrangle. I also used smaller wood pieces for the guides and they don't have a big enough attachment area, so they tend to pop off. I may have to use screws underneath. I haven't managed a full circle, but can get something like a pear shape out of it (see the backless two stringed fretless lute), so it's still good!
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