06-13-2018, 10:05 PM
That’s some very interesting stuff there Mr. EOU.
I am aware that the blades used in previous rolling tests referred to here for comparison were commercial knives, meaning that they were originally factory hardened and sharpened. The blades were then sharpened again on a Kally before rolling tests were performed. So the commercial blades were sharpened after hardening.
This latest test data shows that steel edges that have been hardened and not sharpened after hardening roll approximately the same amount as the previous blades that were sharpened with a Kally before roll testing.
While these results are preliminary and obviously based on a very limited data set, they indicate that sharpening on a Kally does not weaken the edge, or increase the propensity of the edge to roll. Any weakening or softening of the edge caused by sharpening with a Kally is negligible.
If it is true that sharpening with a Kally does not decrease edge strength, we could further conclude that hand sharpening with a stone would have similar results. No better or worse than sharpening on a Kally. Obviously, hand sharpening would not actually increase blade edge strength, so basically the same as sharpening with a belt grinder.
Of course this is considering that the blade is sharpened normally, and not carelessly and grossly overheated when sharpening on the Kally or any other belt grinder, but given that, there is little or no difference between powered and hand sharpening as far as the final edge strength and resistance to rolling is concerned.
I am aware that the blades used in previous rolling tests referred to here for comparison were commercial knives, meaning that they were originally factory hardened and sharpened. The blades were then sharpened again on a Kally before rolling tests were performed. So the commercial blades were sharpened after hardening.
This latest test data shows that steel edges that have been hardened and not sharpened after hardening roll approximately the same amount as the previous blades that were sharpened with a Kally before roll testing.
While these results are preliminary and obviously based on a very limited data set, they indicate that sharpening on a Kally does not weaken the edge, or increase the propensity of the edge to roll. Any weakening or softening of the edge caused by sharpening with a Kally is negligible.
If it is true that sharpening with a Kally does not decrease edge strength, we could further conclude that hand sharpening with a stone would have similar results. No better or worse than sharpening on a Kally. Obviously, hand sharpening would not actually increase blade edge strength, so basically the same as sharpening with a belt grinder.
Of course this is considering that the blade is sharpened normally, and not carelessly and grossly overheated when sharpening on the Kally or any other belt grinder, but given that, there is little or no difference between powered and hand sharpening as far as the final edge strength and resistance to rolling is concerned.