Flattening "spinning" BCC's - Ceramic blanks have a concave? (1 Viewer)

[timinater]

Just wondering if anyone has had experience with flattening chips that aren't necessarily warped, but cupped more than anything?

• When they are stacked they will wobble quite a bit, and will spin on a flat surface.
• When I stack them in between ceramics it appears that the chips nest in the blanks, and stack nicely.

I'm wondering if my blanks have a slight concave? Are there different blanks I should be looking for that a uniform across the surface, or is the method of flattening more for a sever warp, rather than the slight imperfection that causes them to spin.

Any thoughts would be appreciated.