Quantifying Sharpness III 

Professional Knife Sharpening Services Should Deliver Professional Edges. Three Short Videos Showing The Edge On Up Sharpness Tester In Action, And How It Helps Me Give You Consistently Sharp Edges

Here are three videos Sarah shot for me on 7/22/2022. The top one, of her beautiful but dull petite chef's knife, shows it cutting the certified test media, requiring nearly 550 grams of force. This is the starting point.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The second video shows the knife after sharpening with 80 to 2000 grit bonded diamond stones, and finishing with a 3000 grit ceramic, all at 16.5 degrees per side. This part of the test was conducted BEFORE stropping. Force to cut was reduced to 198 grams. This is precisely the routine I now use on every knife I sharpen.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Video three shows the same knife with no further sharpening, but after stropping on a hard backed denim strop loaded with Flitz chrome polish, and then a smooth leather strop loaded with .25 micron diamond paste. The knife received only THREE strokes per side on each of the two strops. The stropping took the knife to 156 grams, right in the middle of the sweet spot I'm looking for...
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This little test reveals a couple of surprises. 
1- Knives sharpened to high grit finishes and deburred well with each stone need very little stropping.
2- To get the most from your sharpened edges, stropping as a "deburr and polish" finishing step is a necessity. 

3- Sarah didn't think her knife was particularly dull. It was.

4- Over Stropping is a very real phenomenon, at least for me.

 

More FREE Learning:

Quantifying Sharpness Part 1
Quantifying Sharpness Part II

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Thanks for reading,

Keith

Keith Nix Knives