Cone drilled on Curved Plate
R1 is the radius of the plate. You have a 4" x 4" square plate with 0.5" thick. Now bend the plate to a radius of R1 (outer) and r1 (inner). Drill a taper cylinder on the top of the plate in center the make a cylinder of radius R2 (outer) and r2 (inner). What throw me off is the curved plate. if you look at the plate from top view you will not see two circle, you would actually see two ellipses. if you please provide me your email i would send you the picture.