09-12-2018, 08:51 PM
The very first time I used my PT50B I was amazed at how informative it was and how well it worked. It’s actually addictive and I use it with every blade I sharpen. Combined with a microscope I learned more about sharpening in a month than had in years wallowing in supposition and speculation.
I suspect the variation in sharpness data you present has more to do with burr, or lack thereof, than incomplete grinding of the apex. Grinding is quick and easy. Burr removal, especially when trying to preserve a toothy edge is far more demanding in my experience.
FWIW, and I am no expert, I have found that unless the object is to duplicate a DE razor type of edge, grit has less to do with sharpness than edge finish. I’ve been able to produce 60-70 edges using only a 150 grit belt for the grinding. Very sharp but still nice and toothy.
Anyway, please keep us informed of your further testing!
I suspect the variation in sharpness data you present has more to do with burr, or lack thereof, than incomplete grinding of the apex. Grinding is quick and easy. Burr removal, especially when trying to preserve a toothy edge is far more demanding in my experience.
FWIW, and I am no expert, I have found that unless the object is to duplicate a DE razor type of edge, grit has less to do with sharpness than edge finish. I’ve been able to produce 60-70 edges using only a 150 grit belt for the grinding. Very sharp but still nice and toothy.
Anyway, please keep us informed of your further testing!