I am trying to use the OD Arc wizard under Mach3 turn to cut a radius on the end of a rod. Here is the scenario:
I have a piece of hex bar that I want to cut a radius on the end of. I am making a few wheel nuts.
The bar is 20.4mm across the points of the hex. I want a radius that is 3mm below the edges of the hex, and covers all of the end of the bar. I am fairly sure that I have done this type of thing successfully in the past, and I seem to have in my mind that I specified a sphere diameter that was larger than the end of the bar, then used the graphic in the wizard that shows where it will cut, to fine tune the arc until it covered the end.
I am using these parameters: Z center 0, Z start 10.2, Z end 7.2. X start 10.2 X end 0
With the sphere diameter set to 20.4mm, the wizard does what I would expect, and proposes cutting a 1/2 sphere, finishing 10.2mm down the nut.
If I put a larger sphere diameter into the wizard, the image on the screen in the preview, is nothing that I am able to understand.