This is a very vague question but here are some ideas.
1.Laminate the apron out of multiple strips of 1/8-1/4 strips of hardwood, depending on the arc diameter. - Create a form out of a stack of 3/4" MDF pieces cut to the inside radius - Cut notches in the back half of the form about every 5-10 degrees so you can use clamps or just radius the back of the forms concentric to the front. - Make a sandwich of the strips, flat on a table, with glue in-between each (use poly or resin glue that hardens to hold the shape, not typical wood glue. - Place the snadwiched stack against the form with clamp at the center. Add clamps out toward each end slowly pulling the sandwich into the form. - Oh yeah, wax the form first or use wax paper. - You could do this with all cheap wood and only have the outer layer be nice or even veneer it after.
- Do basicially the same thing but use wiggle-wood (a bendy plywood) and veneer or outer strip.
- Go to tablelegs.com and buy a pre-made radiused apron.
- You ca