Try this at home. New sharpening method.

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Wartstein
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Re: Try this at home. New sharpening method.

Postby Wartstein » Tue Feb 23, 2021 7:50 am

pantagana23 wrote:
Tue Feb 23, 2021 4:00 am
That's a micro-serrated edge

Here is a screenshot from the second vid (https://www.youtube.com/watch?v=ChiFWYb7_VM).
Whatever it may be worth.

Image
Top three going by pocket-time: Endura 4 in VG 10/Micarta-scales; Stretch 1 in VG 10; Endura 4 in HAP 40

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Re: Try this at home. New sharpening method.

Postby Sumdumguy » Tue Feb 23, 2021 8:39 am

It's funny, this is what they would do to heads to get more flow. They would dimple(or just coarse finish) the roof portion of the valve ports and polish the floor.

The dimpled roof would cause turbulence in the air passing over it, forcing subsequent air to pass below on the shorter, polished section, increasing air velocity and decreasing the distance it had to travel to get to the combustion chamber.

Sometimes my brain takes weird paths with info... But, the more you know, right?

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Re: Try this at home. New sharpening method.

Postby Evil D » Tue Feb 23, 2021 8:48 am

I've tried the coarse/fine grit combo on my SE blades, using diamond or CBN on the grind side and ultra fine on the back side. My thoughts were to just try to make as little bevel on the back of the blade as possible.
SHARPEN IT LIKE YOU LOVE IT, USE IT LIKE YOU HATE IT
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Wartstein
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Re: Try this at home. New sharpening method.

Postby Wartstein » Tue Feb 23, 2021 9:05 am

Evil D wrote:
Tue Feb 23, 2021 8:48 am
I've tried the coarse/fine grit combo on my SE blades, using diamond or CBN on the grind side and ultra fine on the back side. My thoughts were to just try to make as little bevel on the back of the blade as possible.

:eek: ... in the context of this thread for me this is a bit like a "Davids casual bombshell" ;)

Any results or impressions yet if edge retention did improve? If so, only in certain tasks?
Top three going by pocket-time: Endura 4 in VG 10/Micarta-scales; Stretch 1 in VG 10; Endura 4 in HAP 40

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Re: Try this at home. New sharpening method.

Postby kobold » Tue Feb 23, 2021 9:07 am

A helpful screencap:

Image
SpydieChef, Swayback, Manix2 S110V G10, Gayle Bradley 2,
Native 5 Rex45 G10 & LC200N SE FRN & S35VN SE DLC FRN & Fluted Ti.
Military S110V, PM2 DigiCam DLC & Maxamet, Para 3 Maxamet, Sage 5 CF, Chaparral Raffir Noble & FRN,
Tasman Salt 2 SE, Caribbean Sheepfoot SE,
Incoming: Military Camo/DLC, Native 5 fluted CF, Native Chief Rex45.

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Re: Try this at home. New sharpening method.

Postby Wartstein » Tue Feb 23, 2021 9:13 am

kobold wrote:
Tue Feb 23, 2021 9:07 am
A helpful screencap:

Which you can find four post above yours already...viewtopic.php?p=1497374#p1497351 :D (no offense, that´s totally fine, and yours is a lot better made! :) )
Top three going by pocket-time: Endura 4 in VG 10/Micarta-scales; Stretch 1 in VG 10; Endura 4 in HAP 40

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Re: Try this at home. New sharpening method.

Postby u.w. » Tue Feb 23, 2021 9:17 am

Wartstein wrote:
Tue Feb 23, 2021 7:49 am
Really, really interesting once more!

Especially, as said at the beginning of the vid, the guy that came up with the "250 / 6000 grit" -edge thinks it would be (quoting Cedric): "Truly versatile and form fitting for most purposes"

Also interesting what the "physics" / "mechanics" behind this findings may be. Paraphrasing Cedric: Is it more like that the coarse edge "leads" and when it breaks down the polished edge takes over? Or vice versa? Or something else?
Just a polite note: They guys name who makes the video(s), and who you are "quoting" and "paraphrasing" is, Pete. - Not Cedric-
Pete named the channel "Cedric & Ada" after his two (at the time) dogs. Cedric (RIP), and Ada the Husky.

As to the these sharpening videos, they are interesting. I wonder also, how much, if at all, does the grind direction come in to play? Which he mentions in the video.

u.w.

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Danke
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Re: Try this at home. New sharpening method.

Postby Danke » Tue Feb 23, 2021 9:23 am

Isn't this how they already sharpen scalpels?

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kobold
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Re: Try this at home. New sharpening method.

Postby kobold » Tue Feb 23, 2021 9:24 am

Wartstein wrote:
Tue Feb 23, 2021 9:13 am
kobold wrote:
Tue Feb 23, 2021 9:07 am
A helpful screencap:

Which you can find four post above yours already...viewtopic.php?p=1497374#p1497351 :D (no offense, that´s totally fine, and yours is a lot better made! :) )

Hah! Anyway, redundancy is good. Image hosting sites don't last forever.
SpydieChef, Swayback, Manix2 S110V G10, Gayle Bradley 2,
Native 5 Rex45 G10 & LC200N SE FRN & S35VN SE DLC FRN & Fluted Ti.
Military S110V, PM2 DigiCam DLC & Maxamet, Para 3 Maxamet, Sage 5 CF, Chaparral Raffir Noble & FRN,
Tasman Salt 2 SE, Caribbean Sheepfoot SE,
Incoming: Military Camo/DLC, Native 5 fluted CF, Native Chief Rex45.

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kobold
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Re: Try this at home. New sharpening method.

Postby kobold » Tue Feb 23, 2021 9:35 am

Now, imagine doing this to Maxamet or 15V. Sharpen once, cry once... a year. :D
SpydieChef, Swayback, Manix2 S110V G10, Gayle Bradley 2,
Native 5 Rex45 G10 & LC200N SE FRN & S35VN SE DLC FRN & Fluted Ti.
Military S110V, PM2 DigiCam DLC & Maxamet, Para 3 Maxamet, Sage 5 CF, Chaparral Raffir Noble & FRN,
Tasman Salt 2 SE, Caribbean Sheepfoot SE,
Incoming: Military Camo/DLC, Native 5 fluted CF, Native Chief Rex45.

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Wartstein
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Re: Try this at home. New sharpening method.

Postby Wartstein » Tue Feb 23, 2021 9:43 am

kobold wrote:
Tue Feb 23, 2021 9:24 am
Wartstein wrote:
Tue Feb 23, 2021 9:13 am
kobold wrote:
Tue Feb 23, 2021 9:07 am

Hah! Anyway, redundancy is good. Image hosting sites don't last forever.

Exactly! :)
Top three going by pocket-time: Endura 4 in VG 10/Micarta-scales; Stretch 1 in VG 10; Endura 4 in HAP 40

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Re: Try this at home. New sharpening method.

Postby Wartstein » Tue Feb 23, 2021 9:45 am

u.w. wrote:
Tue Feb 23, 2021 9:17 am
Wartstein wrote:
Tue Feb 23, 2021 7:49 am
Just a polite note: They guys name who makes the video(s), and who you are "quoting" and "paraphrasing" is, Pete. - Not Cedric-
Pete named the channel "Cedric & Ada" after his two (at the time) dogs. Cedric (RIP), and Ada the Husky.

As to the these sharpening videos, they are interesting. I wonder also, how much, if at all, does the grind direction come in to play? Which he mentions in the video.

u.w.

Thanks for correcting me!!

Now that you did I realized I even "knew" that... his channel is one of the few knife channels I watch occasionally.
One of his dogs died recently, as far as I can recall.
Top three going by pocket-time: Endura 4 in VG 10/Micarta-scales; Stretch 1 in VG 10; Endura 4 in HAP 40

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Re: Try this at home. New sharpening method.

Postby Evil D » Tue Feb 23, 2021 10:02 am

Wartstein wrote:
Tue Feb 23, 2021 9:05 am
Evil D wrote:
Tue Feb 23, 2021 8:48 am
I've tried the coarse/fine grit combo on my SE blades, using diamond or CBN on the grind side and ultra fine on the back side. My thoughts were to just try to make as little bevel on the back of the blade as possible.

:eek: ... in the context of this thread for me this is a bit like a "Davids casual bombshell" ;)

Any results or impressions yet if edge retention did improve? If so, only in certain tasks?


I don't know that there's any sort of magic happening. The resulting edge is still toothy like it would be coming off diamonds. It seems to me the edge apex ends up being more of a chisel grind this way as opposed to being more of a double bevel V shaped apex. It isn't like there are two edges working together, you still have one apex, it's just smoother on one side.
SHARPEN IT LIKE YOU LOVE IT, USE IT LIKE YOU HATE IT
~David

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Re: Try this at home. New sharpening method.

Postby u.w. » Tue Feb 23, 2021 12:12 pm

I'm with you David, in that I don't know that there is any sort of "magic" happening.

What I'd be curious to see as a continuation, is to sharpen the same knife at the same angle, once at the lower grit, and once at the higher grit (250 & 6000 respectively, according to that drawing, I think), do the same rope cuts, and see what those numbers are.

u.w.

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Re: Try this at home. New sharpening method.

Postby Stuart Ackerman » Tue Feb 23, 2021 12:45 pm

This does not work with Serratas, as these pesky micro serrations will not allow themselves be smoothed off on the one side... :D :cool: :rolleyes:

BTW...I applaud the efforts taken by all folk looking for something new in edge reforming, and as Sal said...
Share the info! :)

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Re: Try this at home. New sharpening method.

Postby Naperville » Tue Feb 23, 2021 2:00 pm

@Larrin, we need you to test this using the systems that you have to see if this can be proven with the scientific method.

This could change the way that manufacturers sharpen knives for retail!
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Re: Try this at home. New sharpening method.

Postby Donut » Tue Feb 23, 2021 3:09 pm

I would like to see what a real edge under one of those digital microscope would look like.
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Re: Try this at home. New sharpening method.

Postby VooDooChild » Tue Feb 23, 2021 4:15 pm

Im interested, but right now I think whoever sharpened it just put a much better edge on it than the factory edge.
sal wrote:
Thu May 28, 2020 8:14 pm
... "The edge is a ghost"...

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Re: Try this at home. New sharpening method.

Postby sal » Tue Feb 23, 2021 5:00 pm

"Back in the day", when we were developing the Sharpmaker (late 70's), we felt that a coarse edge cut more aggressively but lost it's sooner and finely polished edges stayed sharper longer, but didn't cut as well, even slide on some lines. Our solution was a finely polished serrated edge.

But even serrations are available for testing and improvement. We're always trying to incorporate any new information into the factory edge. Eg; A serrated edge helps edge longevity by keeping the cutting edge off of the cutting board. On our K04 and K05 serrated kitchen knives, one tooth is longer to protect the other two teeth.

sal

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Re: Try this at home. New sharpening method.

Postby skeeg11 » Tue Feb 23, 2021 5:52 pm

sal wrote:
Tue Feb 23, 2021 5:00 pm
" On our K04 and K05 serrated kitchen knives, one tooth is longer to protect the other two teeth.

sal
I've been looking for an explanation for the Spydie edge pattern of one large and two small teeth/scallops for quite a while. It makes sense now from an edge retention point of view as I have found that a serrated edge with one size that's the same as the large scallop on Spydies pretty much cuts just as well. One less mystery to obsess over. Thanks Sal!!! :p


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