A photo of a 68LC040 25MHz CPU covered in darkened oil full of abraded metal after being used as a whetstone for a kitchen knife. It worked, but not terribly well by itself.

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   Nanoraptor (nanoraptor@bitbang.social)'s status on Tuesday, 14-May-2024 10:56:51 JST Nanoraptor

   Did you know you can use an early 90s CPU, the ones in the dark subtle purple ceramic package, as a whetstone to sharpen a blade?

   It worked on one of my kitchen knives, but is a little bit fine to do a really top job in a reasonable time. The 040 in the pic turned out not to be as flat on the surface as it seemed - see the squares within squares in the abraded metal pattern.

   Being an LC040 it may be more suited to dhrystone work.