08-18-2018, 07:33 PM
(This post was last modified: 08-18-2018, 08:07 PM by KnifeGrinders.)
... in 17 hours after sharpening the sharpness scores are:
HRC54 = 152 BESS, worsening by 43;
HRC62 = 111 BESS, worsening by 16.
HRC62 is near 3 times better off.
This makes sense as you would expect that a softer steel gets stressed more during sharpening, and the post-sharpening changes in the edge apex would therefore be more pronounced in the softer steel. Definitely so when sharpening on CBN or diamonds using light pressure.
Might be opposite though if sharpened on softer abrasives and clogged stones or worn belts - I can imagine one would need to apply more pressure and time for the hard HRC62 steel and eventually it might get stressed more.
"We were surprised that that they tested as well as they did straight off the #1000 CBN before any deburring. Is this a quality of CBN or did we misunderstand the data? "
True, off CBN and diamonds the burr is times smaller than after a stone of the same grit - the scratches left by CBN/diamonds are narrow and deep, while by stones are shallow and wide displacing more metal.
HRC54 = 152 BESS, worsening by 43;
HRC62 = 111 BESS, worsening by 16.
HRC62 is near 3 times better off.
This makes sense as you would expect that a softer steel gets stressed more during sharpening, and the post-sharpening changes in the edge apex would therefore be more pronounced in the softer steel. Definitely so when sharpening on CBN or diamonds using light pressure.
Might be opposite though if sharpened on softer abrasives and clogged stones or worn belts - I can imagine one would need to apply more pressure and time for the hard HRC62 steel and eventually it might get stressed more.
"We were surprised that that they tested as well as they did straight off the #1000 CBN before any deburring. Is this a quality of CBN or did we misunderstand the data? "
True, off CBN and diamonds the burr is times smaller than after a stone of the same grit - the scratches left by CBN/diamonds are narrow and deep, while by stones are shallow and wide displacing more metal.
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