09-06-2018, 06:04 AM
(This post was last modified: 09-08-2018, 11:58 PM by KnifeGrinders.)
I've got more test data confirming the rule "the softer the steel, the higher the angle" for cleaning the burr base.
Victorinox and SWIBO knives sharpened and deburred by similar routine gave the best sharpness scores at 1.2 degree higher than the edge angle when honing on the felt with 1 micron, as compared to the WiltShire 2 degrees.
As it was shown above, the WiltShire kitchen knife sharpened at 13 dps and deburred on Tormek with the 1-micron felt wheel at 15 dps scores 80 BESS, and after final cleanup on the paper wheel with CHROMOX 65 BESS.
Victorinox boning knife sharpened at 13 dps and deburred on Tormek with the 1-micron felt wheel at 14.2 dps scores 60 BESS, and after final cleanup on the paper wheel with CHROMOX 60 BESS.
SWIBO boning knife sharpened at 13 dps and deburred on Tormek with the 1-micron felt wheel at 14.2 dps scores 70 BESS, and after final cleanup on the paper wheel with CHROMOX 50 BESS.
Victorinox and SWIBO knives, honed on felt at 2 degrees higher, score slightly worse.
Next level up, Global knives get a strong and sharp edge when deburred at an angle within 0.4 degree higher than the edge angle.
As a sidenote, these differences may seem negligent, but they matter when we are putting together a new sharpening protocol.
Because when it comes to a hurried production sharpening, with no control till the final sharpness is checked, especially when we check sharpness by sampling a batch of knives rather than every knife, variations and approximations come into play, and to get all knives sharp within the target range, the protocol must be the best possible.
E.g. when the deburring is set at 15 dps, we expect the actual honing angle in real life sharpening (not the experimental setup) be within 14.5 - 15.5 degrees.
If you are deburring by Tormek means only, you get better sharpness on lower-end knives by 2-step honing, i.e. when you hone on the Tormek leather wheel with the Tormek honing paste or Autosol first at the exact edge angle, and then 1 pass each side at a higher angle - one full revolution of the Universal Support micro-adjust wheel gives approximately 1 degree change in the honing angle.
Victorinox and SWIBO knives sharpened and deburred by similar routine gave the best sharpness scores at 1.2 degree higher than the edge angle when honing on the felt with 1 micron, as compared to the WiltShire 2 degrees.
As it was shown above, the WiltShire kitchen knife sharpened at 13 dps and deburred on Tormek with the 1-micron felt wheel at 15 dps scores 80 BESS, and after final cleanup on the paper wheel with CHROMOX 65 BESS.
Victorinox boning knife sharpened at 13 dps and deburred on Tormek with the 1-micron felt wheel at 14.2 dps scores 60 BESS, and after final cleanup on the paper wheel with CHROMOX 60 BESS.
SWIBO boning knife sharpened at 13 dps and deburred on Tormek with the 1-micron felt wheel at 14.2 dps scores 70 BESS, and after final cleanup on the paper wheel with CHROMOX 50 BESS.
Victorinox and SWIBO knives, honed on felt at 2 degrees higher, score slightly worse.
Next level up, Global knives get a strong and sharp edge when deburred at an angle within 0.4 degree higher than the edge angle.
As a sidenote, these differences may seem negligent, but they matter when we are putting together a new sharpening protocol.
Because when it comes to a hurried production sharpening, with no control till the final sharpness is checked, especially when we check sharpness by sampling a batch of knives rather than every knife, variations and approximations come into play, and to get all knives sharp within the target range, the protocol must be the best possible.
E.g. when the deburring is set at 15 dps, we expect the actual honing angle in real life sharpening (not the experimental setup) be within 14.5 - 15.5 degrees.
If you are deburring by Tormek means only, you get better sharpness on lower-end knives by 2-step honing, i.e. when you hone on the Tormek leather wheel with the Tormek honing paste or Autosol first at the exact edge angle, and then 1 pass each side at a higher angle - one full revolution of the Universal Support micro-adjust wheel gives approximately 1 degree change in the honing angle.
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