But for regular abrasives, me2's point of using less acute angles to reduce problems with these steels (and several other 'problem' steels) is exactly correct.
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Ken
Maybe I'm misreading, but I thought me2 was describing the use of these characteristics to induce carbide tear-out (prior to usage) with intent to create a more micro serrated edge by working it thinner - more acute angles. If one can manage to create such cleanly, with minimum burr remaining, the edge will be very aggressive.
I used such a strategy myself when searching for better retention at work, but never pushed it that far - stopping at < 26* inclusive on 440c (and Aus8) with an 80 grit stone, no post treatment. For pressure cuts it somewhat reduced longevity, but on materials where a low pressure drawing action cut more efficiently, edge retention went through the ceiling (all other factors being the same). Also, by keeping the geometry thin this reduces somewhat the handicap against pressure cuts that is normally the bane of coarse edges.
Overall I think my experiences agree with some of this relative to the use of waterstones, in that the lapping action combines with direct abrasion to produce somewhat unique edge irregularities. These are difficult to reproduce by other means and create cutting characteristics that really help in this application, a clean edge with a narrow cross section but somewhat pronounced irregularities for the edge width.
IMHO, managing the edge effects tends to provide great returns as part of a frequent maintenance scheme, but these are usually the first to be reduced through wear and one is left with geometry and steel composition. That said, I've yet to see a situation where the selection of finish didn't make a notable difference in longevity when faced with a recurring job and not just random usage.
