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Mitchell Jones

wrote:
can you imagine if the conventional wisdom for judging size-tolerance
of fabricated-materials was along the lines of, "how does it feel when
i shave hairs on my arm?"

I want to _measure_ knife sharpness. In a repeatible, scientific
way. And preferably, non-destructive to the sharpened edge!

the floor is open for discussion.

***{You want to cut a homogeneous material that will not take the edge
off of your blade. Use paraffin.

You want the conditions to always be the same, so that you can compare
results. Clamp the blade to be tested so that it forms the horizontal
member of an isosceles triangle, the equal sides of which point
downward. Hang a platform in the "V" and add weights until the blades
cuts smoothly through the paraffin. The less weight required, the
sharper the blade. Always use identical blocks of paraffin.

The weight required, then, is the measure of dullness; its reciprocal is
your measure of sharpness. Always include the weight of the "V" and the
blade in the data you record.

That should work.

--Mitchell Jones}***

************************************************** ***************
If I seem to be ignoring you, consider the possibility
that you are in my killfile. --MJ