Edge Retention/Rolling Test Stand

[KnifeGrinders]

... The reason/cause for 229 versus 160 was not visually discernible using an optical microscope.
... Past experience tells us that 300 points of roll on stainless steel knives is just about the limit. Beyond that, edges usually cannot be fully restored.

I guess the edge in the impact area may look similar to this Todd's SEM image of a knife edge blunted by cutting cardboard