11-01-2017, 02:40 PM
(This post was last modified: 11-03-2017, 08:44 PM by KnifeGrinders.)
Let us use what has already been said in this thread to better define DULL, and place the dullness on the BESS scale.
An edge that reflects light is dull.
Visible light wavelength is 0.4-0.7 micron.
To reflect light, the edge must be over 0.7 micron wide.
DULL is an edge 0.8 micron wide, i.e. over 0.00003 inch.
Given that 50 BESS = 0.1 micron, the dull is over 400 BESS - and this is exactly where it starts on the BESS scale.
This supports that the BESS-to-width correlation is linear in the BESS scale range from 0 to 500.
Steve Bottorff says edge thickness under a few thousandths of an inch may be considrred sharp -
we say under a few tens thousandths.
BTW this is the reason why sharp edges cannot be studied with optical microscopy due to the visible light diffraction limit, and we have to resort to SEM.
An edge that reflects light is dull.
Visible light wavelength is 0.4-0.7 micron.
To reflect light, the edge must be over 0.7 micron wide.
DULL is an edge 0.8 micron wide, i.e. over 0.00003 inch.
Given that 50 BESS = 0.1 micron, the dull is over 400 BESS - and this is exactly where it starts on the BESS scale.
This supports that the BESS-to-width correlation is linear in the BESS scale range from 0 to 500.
Steve Bottorff says edge thickness under a few thousandths of an inch may be considrred sharp -
we say under a few tens thousandths.
BTW this is the reason why sharp edges cannot be studied with optical microscopy due to the visible light diffraction limit, and we have to resort to SEM.
http://knifeGrinders.com.au