Technical

First, you should use complete sentences. I do not understand what you are looking to do.

This is a mechanical drafting topic called "Developments and Intersections" or similar. Unfortunately, the steps can be rather hard to describe with words only.

When I worked in a machine shop, we would make a paper one first. It's easy to make adjustments, and when you get it right, you have your pattern.

Is it round, or oval, or square / rectangular?