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Polish vs Sharpness

Wed Oct 24, 2012 8:06 pm

Hey Guys,

Can someone explain to me how a lower grit stone can create a higher polish than something more than 2x its fineness? From what I know about sharpness and scratch pattern refinement, it seems so antithetical. Specifically I see this occurring from Naniwa 2k Green Brick to the Rika 5k. I just want to understand what's happening on the microscopic level when I make that jump.


Re: Polish vs Sharpness

Thu Oct 25, 2012 1:25 am

It's how the stone works. A stone like the Naniwa green brick does not release its abrasive with most sharpenings, collecting the metal on the surface of the stone which has a burnishing effect to the edge giving it that glossy shine. Compare that to a Rika which is a muddy stone and the released abrasive moving on the surface creates a different effect, a hazy dull look lacking the high luster. These are the two main working styles of stones, polishers or muddy.

Re: Polish vs Sharpness

Sat Oct 27, 2012 3:21 pm

It has to do with now the abrasive cuts. Think of it like this--if you sand wood to 120 grit with a belt sander, you will see scratches. If you sand it to 80 grit with a random orbital sander, you won't see any.

The odd thing is JNats--they will put a hair-snapping, grabby 12k edge on a knife that is as hazy as San Francisco.
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