Programing a large "countersink" in aluminum Disk

[Julien]

Not sure it applies to your need but here’s a recent discussion on using contour toolpaths to do chamfers

Chamfer question

If I have a 1.25" wide hexagon pocket in the middle of a piece of wood and it’s 3/4" deep and I want to put a 0.10" deep chamfer around the top of the hexagon, how would I do that? can I use a 90 deg V-bit and a contour path set to a depth of 0.10 or would I need to do it as a v-carve or use a chamfering bit? thanks!!

(that thread was about wood though)

I don’t think you need 3D toolpaths “just” for countersinking a set of holes, chances are a set of 2D circular contours with appropriate stepdown should work. What tool are you going to use ?