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Advanced Knife Sharpening Series :Blade Asymmetry 101 Done on a Burr King Knifemaker

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Published on Mar 17, 2012

This video is the first in what will be a series of videos on advanced knife sharpening techniques.

I will be demonstrating two major concepts:

How to grind a specific angle on a knife held horizontally

How to adjust blade asymmetry by grinding at a constant angle.

For this video I will be using an inexpensive kitchen knife and a fast belt grinder using an 80 grit belt to quickly demonstrate concepts. I won't be concerned with burr formation, heat generation or other topics.

I show that the Burr King grinder is set up so that the platen is set at a specific angle which I measure with an inclinometer or angle cube as ~ 13 degrees. I demonstrate creating this angle on the blade keeping the knife in a horizontal plane and keeping the edge perpendicular to the belt at the point of contact, NOT raising the blade up at the end of the stroke - unnecessary if the knife is simply rotated in the horizontal plane.

The Norax u936 structured abrasive makes fast work of bevel setting.

I do a bevel on one side of the knife (left) and do a zero grind on the right. Then I demonstrate how I've shifted the asymmetry ratio from a 50/50 or symmetric grind to a 0/100 grind. Then I reverse this back to a symmetric grind and continue to grind to a 100/0 grind.

The key concept of this video is that one can adjust blade asymmetry simply by adjusting how much you grind on either side of the knife and it is completely unnecessary to change angles when adjusting asymmetry.

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