Imagine an insert mounted vertically in between centers on a fourth axis. I have a grinding wheel oriented like a mill. I'm oscillating the z axis up and down while I rotate the insert back and forth. I have cadded the points, and I should end up with a radius, but I can't get what I want. I usually get two flats or a very large radius. I'm pretty sure that I need to adjust the feed on the fourth axis, but the only setting that will let me do that is the diameter setting in the control (which doesn't seem to help). It is a mini-mill with a collet style fourth axis. I'm just not sure what I'm missing...