I have a question about fixing a small thin metal material.
I’m using nomad3 and tried to fix a metal coin with a diameter of 20mm and a thickness of 1mm.
I dug a 3mm deep coin-shaped groove on a wooden board and fixed the coin in it with double-sided tape. But the heat melted the glue and the coin kept shaking.
I used this for a larger 3" Christmas Ornament, but the concept should work.
You could use a clamp on the right side to hold the coin, or in mine I have a screw that clamps the disc.
I have used @Tod1d method for a lot of round work. I cut a jig and put a slot like Tod’s and then drill in from the side and put the material in and insert a screw to fasten the circle tight around the object. The painters tape and super glue method works well. You put down painters tape on the spoilboard. Then painters tape on the back of your material. Then apply super glue and let it set up. Then machine as needed. When done just pry up the tape and remove from the back of the material and the spoilboard. This method has been used for years by the CNC Community is works well.