I have the need to make a what is in effect a clamp with a spherical hole in it rather than a cylindrical hole in it.
How should I go about it?
I have seen ball turning attachments but can't get my head round how to go about using one to turn what is in effect a spherical cavity.
The clamp will be 3/4 inch thick and the diameter of the sphere it need to clamp is 1 1/2 inch.
I have done a bit of Google searching to no avail, probably I am not using the correct terms.