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Made one with a bench grinder and two mdf discs. One I coated the edge with glue and grit, the other gets covered with jewellers rouge. Takes about a minute per knife to get them razor sharp. Have also used it to sharpen axes and hatchets.
A bit like this http://dcknives.blogspot.com/p/diy-sharpening-wheel.html?m=1
Except I have another disc with iirc 400 grit. But I’d need to check
Anyone made or bought a knife grinder / belt grinder?