08-15-2018, 06:00 PM
(This post was last modified: 08-15-2018, 06:19 PM by KnifeGrinders.)
Our data on effect of subsequent honing at a little higher angle.
The knives are SWIBO, stainless steel with 0.5% carbon and HRC56-58, sharpened at 20 dps.
Measured the initial sharpness, then in 24 hours. After that gave them one pass each side on a paper wheel with 0.5 micron diamonds at a +0.4 degree higher angle, i.e. at 20.4 dps, and let them idle for another 24 hours, then measured the sharpness again.
INITIAL SHARPNESS (BESS) - IN 24 HOURS - IN 24 HOURS AFTER EXTRA HONING WITH 0.5 MCRN DIAMONDS @ +0.4 DEGREE HIGHER
55 - 105 - 60
85 - 110 - 95
90 - 125 - 92
75 - 110 - 85
The final loss of sharpness is <= 10 BESS compared to the initial, which we attribute to oxidation; I believe we've got rid of the stressed steel on the apex completely.
In addition to stropping on clean leather as detailed in Grepper's posts above, we have two more tricks to beat the post-sharpening loss of sharpness:
1) In your sharpening session, deburr at a higher angle with a 5-6 micron honing compound- depending on the steel the angle should be 0.4, 0.8, 1.2 or 1.6 dps higher (some loss of sharpness does occur due to the apex rounding, by 10-20 BESS) - commonly approx. 1 degree higher angle works well.
2) In a day (min in 17 hours) after sharpening, gently hone with a 0.5 micron honing compound at 0.4 dps higher angle (keenness of the edge is preserved).
The knives are SWIBO, stainless steel with 0.5% carbon and HRC56-58, sharpened at 20 dps.
Measured the initial sharpness, then in 24 hours. After that gave them one pass each side on a paper wheel with 0.5 micron diamonds at a +0.4 degree higher angle, i.e. at 20.4 dps, and let them idle for another 24 hours, then measured the sharpness again.
INITIAL SHARPNESS (BESS) - IN 24 HOURS - IN 24 HOURS AFTER EXTRA HONING WITH 0.5 MCRN DIAMONDS @ +0.4 DEGREE HIGHER
55 - 105 - 60
85 - 110 - 95
90 - 125 - 92
75 - 110 - 85
The final loss of sharpness is <= 10 BESS compared to the initial, which we attribute to oxidation; I believe we've got rid of the stressed steel on the apex completely.
In addition to stropping on clean leather as detailed in Grepper's posts above, we have two more tricks to beat the post-sharpening loss of sharpness:
1) In your sharpening session, deburr at a higher angle with a 5-6 micron honing compound- depending on the steel the angle should be 0.4, 0.8, 1.2 or 1.6 dps higher (some loss of sharpness does occur due to the apex rounding, by 10-20 BESS) - commonly approx. 1 degree higher angle works well.
2) In a day (min in 17 hours) after sharpening, gently hone with a 0.5 micron honing compound at 0.4 dps higher angle (keenness of the edge is preserved).
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