I have bought the 3/4 inch plywood I will need in order to make the bending form JIG to make this chair’s two rockers. I got a clarification from Tom, my online instructor, for the undocumented radius for the outer form’s radius.
The inner radius was clearly marked on the full sized plans to be 42 inches. I did not see any documentation for the outer’s curve radius, but it could be deduced with math. The rockers are made from eight 1/8 inch thick strips plus two clamping cauls of 1/8 inch thick masonite waxed up would be inserted between the outside of the glued striips and between the clamping form. So do the math: eight 1/8” strips plus two 1/8” gluing cauls equals 1 1/4 inches. Thus, add that to the inner curves’ 42 inch radius gives us a 43 1/4 inch radius to make the outer clamping form’s curve.
I will make a compass that I can change the radii or radiuses. I’ll strike the curve on a 1/4 inch masonite board where I can then cut out the pattern on my bandsaw. Tom, I believe used a plunge router and cut it the pattern that way. I can give that a try also.
The close-up view of these clamping forms to make the rockers.
-- --- Happy Howie