08-07-2018, 05:00 PM
(This post was last modified: 08-07-2018, 08:32 PM by KnifeGrinders.)
Hi Larrin,
0.05 micron is the apex radius of a standard DE safety razor, the PT50 displays it in nm, i.e. 50 nm.
The BESS-certified test line is calibrated so that 50 grams (gram-force) required to sever it with a DE razor correspond to the 50nm cutting edge apex radius. Thanks to that we can read the apex radius in nm straight from the instrument display. The display reading of 50nm tells us of the edge thickness of 100nm (50nm x 2) or 0.1 micron.
BESS Score to Edge Width correlation in the lower BESS scale
http://www.bessex.com/forum/showthread.php?tid=186
Sharpness Chart
http://www.bessex.com/forum/showthread.php?tid=205
Larrin, your side-finding in that study is dazing: "Interestingly, double bevel edges cut with less force at the same angle as the single bevel edges." - and is an interesting scientific data on the difference between the Japanese and European knife tradition.
Keeping in mind what you've found , I re-checked the edge rolling numbers for chisel grind vs double bevel blades, scattered in the EDGE RETENTION/ROLLING PART II thread, and see that in Mike's tests chisel ground bevels roll more, in support to your findings.
0.05 micron is the apex radius of a standard DE safety razor, the PT50 displays it in nm, i.e. 50 nm.
The BESS-certified test line is calibrated so that 50 grams (gram-force) required to sever it with a DE razor correspond to the 50nm cutting edge apex radius. Thanks to that we can read the apex radius in nm straight from the instrument display. The display reading of 50nm tells us of the edge thickness of 100nm (50nm x 2) or 0.1 micron.
BESS Score to Edge Width correlation in the lower BESS scale
http://www.bessex.com/forum/showthread.php?tid=186
Sharpness Chart
http://www.bessex.com/forum/showthread.php?tid=205
Larrin, your side-finding in that study is dazing: "Interestingly, double bevel edges cut with less force at the same angle as the single bevel edges." - and is an interesting scientific data on the difference between the Japanese and European knife tradition.
Keeping in mind what you've found , I re-checked the edge rolling numbers for chisel grind vs double bevel blades, scattered in the EDGE RETENTION/ROLLING PART II thread, and see that in Mike's tests chisel ground bevels roll more, in support to your findings.
http://knifeGrinders.com.au