Hi BurrMan,

using a CAM software is a good idea if the software is able to create a bare spiral. I followed your proposal and tested different toolpaths created by different milling strategies. The best result is attached (blue lines). But the CAM software is not creating a spiral and is automatically doing S-linking between the different offset lines. There is no option to get the CAM not doing that.

BR, Joerg

you'll need to be able to do some type of spiral pocketing. I think my software has it. I'll have to go crank it up and look in a few.

The ai is tricky to prompt to get results. Because it is actually a "Morph Spiral". Not just a standard pocket or boundary pocket

Here is me attempting to get results with your file

Started with to proper path

then tried to get more "revolutions"

Finally made it all the way to center with revolutions and lost ability to control step

Its getting complex