Super polished edges

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Beautiful work again, Josh. - When you do a mirror edge, do you automatically add a microbevel? Or do you see it as an additional option? I find myself always doing it now primarily because I've read so many times that it further stabilizes an apex by helping to prevent chipping. I haven't decided if it's overkill or genuinely necessary...because I've been able to achieve "scary sharp" both ways.
 
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Keep in mind; a knife edge can be @ a high degree of polish and still not be sharp. The apex does not reflect an image and in the end, its the condition of the apex that matters.

Fred
 
Scrim said:
Beautiful work again, Josh. - When you do a mirror edge, do you automatically add a microbevel? Or do you see it as an additional option? I find myself always doing it now primarily because I've read so many times that it further stabilizes an apex by helping to prevent chipping. I haven't decided if it's overkill or genuinely necessary...because I've been able to achieve "scary sharp" both ways.
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You do some mighty fine work yourself my friend ;) Most of the time I will increase the angle by 1 dps and microbevel extremely lightly just to be sure I'm hitting the apex w/ my finest stone but other than that - on mirrored edges - I don't. I will, soon, be beginning to push my edges down to 8-10 dps w/ microbevels and see how they hold up to semi-hard use. Should be fun =)

Fred.Rowe said:
Keep in mind; a knife edge can be @ a high degree of polish and still not be sharp. The apex does not reflect an image and in the end, its the condition of the apex that matters.

Fred
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Very true Fred, the apex is what matters most. Over stropping can kill it as well as round it so much it's ineffective. You can have a pretty bevel w/ zero performance which is not what we are after!

Steel_Drake said:
One more for you guys: My Calton Cutlery 440C Necker, also at 13k.

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If i didn't know better, that looks like a mighty thick edge for Joe Calton's knives... but if I remember correctly you set your edges at about 8 dps no? Very nice indeed.
 
Why stop at the edge??? :)

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(Didi it with auto body sandpaper... and yeah, I only did it once). :)
 
DeadboxHero said:
Ooo nice how's that Hap 40 treatin' ya?
Also what stone progression?
Great work
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It is still very early with the HAP 40, but I really like it so far. It appears to have good high-sharpness edge retention with a highly polished apex, and has no trouble taking a very high level of push cutting sharpness. As far as my very limited understanding of metallurgy goes, both are expected side effects of the high apex stability of HAP40/M4.

The stone progression on the ~8 dps edge bevel was Sigma Power Select II 1,000 -> 6,000 -> 10,000 -> 13,000 and then the apex was set using a micro bevel created with Spyderco Sharpmaker fine rods (which behave much more fine that their grit rating when used with grams of force and mineral oil). The resulting level of push cutting sharpness is well into absurd territory: Push cutting through a whole sheet of phone book paper at 90 degrees across the grain, passing HHT 3-4 on my extremely fine head hair, push cutting a tomato down to the cutting board, etc.

razor-edge-knives said:
If i didn't know better, that looks like a mighty thick edge for Joe Calton's knives... but if I remember correctly you set your edges at about 8 dps no? Very nice indeed.
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Yeah, i run my edge bevels at ~6-8 dps, so while it looks fairly wide, that edge is actually ~0.08" thick at 1/32" behind the apex.

I will, soon, be beginning to push my edges down to 8-10 dps w/ microbevels and see how they hold up to semi-hard use. Should be fun =)
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That's what I do. I run my edge bevels at ~6-8 dps and ~0.010" thick at 1/32" behind the apex and then micro-bevel at 15 dps using a Spyderco Sharpmaker. The edges I get this way have been plenty strong enough for my EDC uses (food prep, clean cardboard, clam shell packaging, low risk of hard contacts) while also--for me--being easier to avoid rounding the apex than with stropping.
 
I don't have any of the water stones for my WEPS but take it down to .5 micron on standard leather strops. Plenty sharp for me!


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I touched up the edge-bevel on my Calton Cutlery 440C Necker this morning and decided to take a couple more pictures of it:




Fred.Rowe said:
Keep in mind; a knife edge can be @ a high degree of polish and still not be sharp. The apex does not reflect an image and in the end, its the condition of the apex that matters.

Fred
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These two videos I took with the my Calton Cutlery 440C Necker constitute my response:

[video]https://youtu.be/hx1p9Xe2X-4[/video]
[video]https://youtu.be/DkwOw0AuEOc[/video]
 
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