Clearly I didn't explain my conundrum very clearly. However, Jim somehow managed to figure out exactly what I was going for despite my vagueness. (Well done!)
Yes, the rounded corners I'm referring two will be the two corners at the foot of the horizontal frame. There will be a headboard, but it has no bearing on these corners.
The bed will be hardwood, no laminate. Horizontal grain for the majority of the frame, but I am intending to switch to vertical for the corners at the foot.
They will be 90deg corners, 2.5" inside radius, 3.25" outside radius, ideally cut from a single piece of 1.5"x 4.6"+ red oak hardwood, but since .75" is the thickest available at home depot I'll try bonding two of those first to see if the glue lines show.
The cove will only be cut down 2.5" on the inside, while the outside will be that 3.25" radius curvature the entire 8" length, that should leave these pieces very strong.
These will not be structurally significant pieces other than the fact that people will sit on the corners occasionally. The corners will be attached to the lateral edges via aluminum pegs(for alignment), and to the structural members via a single (isosceles) trapezoidal block
My question was really only about how best to cut the coves. I'm pretty confident in the rest of my design. I like the tablesaw cove method as it will be far more precise than a bandsaw and does not force me to cut the entire length of the board.(really happy about that!)
Based on this statement:
I'm building a bed and want to create rounded corners that measure 8" tall, 0.75" thick, with a radius of 2.5".
I'm building a bed ... OK, the headboard or the horizontal portion, the frame?
..with rounded corners .... are there 4 corners or 2? are they 90 degree corners? Do framing members run off these corners? How do you attach the headboard IF there is one?
.... that measure 8" tall, .075" thick ..... solid wood? laminated sections?
.... with an inside radius of 2.5" .... OK, what about the outside radius? Would that be 2.5" + .75" for a total of 3 .25"?
Obviously, the fastest way is to saw them out of solid stock using a bandsaw with a depth of at least 8". Solid stock will have structural issues because of the grain directions, so a lamination will be better. But, you don't want to have glue lines show...
There are some issue here that need resolution.