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I think what gugi was trying to say was, if an edge is well-honed and polished, sharpness is primarily a function of the geometry (bevel angle) of the edge. The sharper the angle, the sharper the...

Revision 2 of the FCT ("Filament Cut Test").

This is a piece of wood 3.5" long, with two 4d nails at 0.5" and 3.0". I also bored two 3/32" holes on the ends for a piece of round toothpick to peg...

The tension and deflection rate would show up as increased variation (inconsistency). That doesn't appear to be happening. In fact, right now I don't know if the accuracy of the force gauge isn't the...

Thanks for pointing out the typo, which I've fixed in the posting.

Actually, you yourself are making a type of "all or nothing" argument here: "what you end up with is a test of how well razors...

These recent comments are of the "half empty" vs. "half full" variety.

There are those who believe "all or nothing", and those who believe in "something".

King Camp Gillette became one of the...

I have two razors (both Fermaruds) that are clearly not shave ready yet, despite my first attempts at bevel setting and polishing. They both tug severely in shaving.

I have two more razors that...

Northpaw said on a previous thread:

"Since my thread is of an unknown origin, any numbers would be absolutely meaningless. However, three things about my testing were promising:

1. Consistency...

See:

ASTM D2256 Thread and Yarn Tensile Strength Test

For the ASTM test method for ultimate strength of thread/yarn. This is a starting point for ideas, with the razor introduced as a new...

Thanks for all the links to prior art. Apparently others have done a lot of the spadework.

There are obviously a number of factors involved in measuring sharpness:

1. Edge geometry (e.g.,...

A lot of the criticism about the use of the HHT to judge razor sharpness has been in the area of the incomparability between people, because the hairs used are different thicknesses, have more or...