woodwrangler

I glued up elliptical header moldings using a similar arrangement. After determining the shape of the final piece and laying it out with straight board sections, I drilled somewhat oversized holes for the clamp pipes, locating them where they would do the most good. I used the clutch-plate tail-pieces on the underside and added stiffening 2x4s on edge going the length of the jig and in between, next to the holes. The bottom of the clamps hooked onto these stiffeners and held the boards to the table, with scraps protecting the boards, to produce flat finished moldings. I used biscuits in the ends of the board pieces where they would not show in final form and let it set overnight, ready for final shaping. I still have that fixture 19 yrs later.