Hello all, I was asked by a friend if I could machine a small part in hard wood or aluminium. He had asked a 3D expert to make the part on a 3D printer and the result was unusable by dint of poor adherence to the measured specifications. Here are a couple of images followed by the questions which indicate how the project will look when finished.
My questions concern how I would plan to cut the internal and external radii. I know the dimension which the internal radius must fit. With the proviso that I keep the material between the internal radius and the external radius correct for thickness, the external radius should take care of itself. The red section in the following image shows this effect. The only parameters I have is been given apart from length, hole sizes, shape and position is that the internal radius must fit a diameter of 22mm and that the maximum thickness of the material at the centre is precisely 5mm.
What I am hoping to learn are what calculations I must complete to create the internal radius. Will the external radius require similar calculations? Should I machine the internal radius first? Any help or advice will be very much appreciated. Thank you.