Thread: My razor is too sharp???? I like a duller edge??

Continued:

from bottom of pg 9 - figure 12:

This shows a photo of a 1000 grit edge, taken at 3000x, showing the edge thickness is 1 micron.

He later references this in his flat hone and flatbed strop chapter as being his control blades for that chapter - he takes these and hones them on a variety of hones.

So at 1000 grit the edges are 1 micron thick. At 6000 grit they are at 0.5 micron thick. And at 8000x they are 0.5 micron thick. And at 0.5 micron chrome oxide they are also 0.5 microns thick.

The 0.38 number I was tossing around earlier appears to be the minimum thickness (the edge thickness varies at different places along the edge). But the minimum thickness appeared to be pretty constant. The maximum thicknes varies depending on burrs and such.

Another interesting snippet (pg 11):

"The 600 and 200 grit wheels produced surfaces that were difficult to tell apart. In both cases the face abrasion marks were significantly larger and the edge burrs significantly wider and more convoluted than found with the 1000 grit wheels. In addition, the face view of the edges were significantly rougher and less straight than on the 1000 grit wheels. Nevertheless, the edges produced by the 600 and 200 girt wheels are quite thin, with a burr width on the order of 2 to 3 μm on the 600 wheels and 2 to 4 μm on the 200 wheels. And, from a practical point of view, the edges are quite sharp, being able to cut arm hair as well as the 1000 grit edges. Neither cut hair as easily, however, as a razor blade. This later fact is probably due in large part to the much smaller edge angle of the razor blades, 2β of 17o versus 40o."