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If you mean this machine here:
Sharpness tester

The web page says this:


It looks like they are saying there is no slicing motion involved.

I wonder how much that machine costs to buy AND...

I would only need the string to be consistent in each spool, from beginning to end, not necessarily between spools. There is no trusting different spools. One spool should last a long time.

I...

Yeah, I was just wondering about that. Micro serrations and/or a wire edge after 1K could cut the string just as easily as a 12K finish. Something to think about...

Yes, those divisions were...

Thinking of ways to quantify or measure sharpness, I came up with this contraption. I have not actually built it yet.

Basically it is a weight on a string and a razor, all held on a plank. The...