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TOPIC: A great selling point

A great selling point 5 months 1 week ago #16667

  • wickededge
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I recently completed a fun test for a white paper I'm working on. I purchased two Victorinox 8" Chefs knives, commonly used in commercial kitchens. I measured the widths of the blades and tested their sharpness on our testing machine. I then sharpened one with Wicked Edge Pro-Pack II and sent the other off to a professional sharpening service. I then re-measured blade widths, tested them on the sharpness testing machine and performed one last test - I cut a stalk of celery in half, then cut sections from each half, one with the Wicked Edge sharpened knife and the other with the sharpening service sharpened knife. Here are the preliminary results:

Original Width:

Blade 1 - 1.818"
Blade 2 - 1.765"

Post Sharpening Width:

Blade 1 - 1.741"
Blade 1 - 1.764"

Change:

Blade 1 - 0.077"
Blade 2 - 0.001"

Initial Sharpness:

Blade 1 - 307
Blade 2 - 313

Post Sharpening Sharpness:

Blade 1 - 584
Blade 2 - 127

Difference:

Blade 1 - (-277) 190% more force needed after sharpening
Blade 2 - (+186) 60% less force needed after sharpening

Any guesses as to which is Blade 1 and Blade 2?

For the finale, here are the images of the celery after 4 and 5 days in the refrigerator:

Attachment Day-4-Celery--2.jpg not found



Attachment Day-5-Celery.jpg not found



Any guess as to which knife cut which stack of celery?
--Clay Allison
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Re:A great selling point 5 months 1 week ago #16670

  • razoredgeknives
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Lol no contest! Blade 2 is sharpened on weps! I remember a similar test you did a few years ago :-) gotta love it!

It's a huge difference in how much metal is removed for sure!

Josh
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A great selling point 5 months 1 week ago #16672

  • LeoBarr
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A sharp knife does two things it will almost leave a glaze/sheen on the surface of the cut surface , cells are parted so there is less water loss the flatter surfaces create a better seal from creeping oxidation - this can be seen very rapidly on an apple cut & peeled with a sharp knife as opposed to a blunt one.
So I would say the more uniform coloured celery is the WE one.
It looks as if the outside sharpeners/ bluntners did just that (bluntened it) Victorinox are reasonable sharp out of the store .
I would think apple or tuna would illustrate this well too.
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A great selling point 5 months 1 week ago #16678

  • cbwx34
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Do you have any pics of the edge(s)?
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A great selling point 5 months 1 week ago #16679

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cbwx34 wrote:
Do you have any pics of the edge(s)?

No, not yet. I'll get some when they come back from CATRA.
--Clay Allison
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A great selling point 5 months 3 hours ago #16855

  • wickededge
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Got our results back from CATRA. It was pretty much what we expected though it's great to have an independent lab verify it for us.

graph.jpg


The Wicked Edge sharpened knife is Knife #1.

A nice bonus from this process was that our own, in-house testing results were so well validated.
--Clay Allison
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A great selling point 5 months 3 hours ago #16856

  • EamonMcGowan
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SWEET!!! :P
The definition of insanity is to do the same thing over and over again and expect a different result?
An old Irish toast, May the wind always be at your back, may you always have work and may you be in heaven a half hour before the devil knows your dead. Cheers!
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A great selling point 5 months 2 hours ago #16858

  • mark76
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Clay, can you tell us what the units on both axes mean? I googled the ISO standard, but not with a lot of success.
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Re:Re: A great selling point 5 months 2 hours ago #16859

  • razoredgeknives
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wickededge wrote:
:

Original Width:

Blade 1 - 1.818"
Blade 2 - 1.765"

Post Sharpening Width:

Blade 1 - 1.741"
Blade 1 - 1.764"

Change:

Blade 1 - 0.077"
Blade 2 - 0.001"

Initial Sharpness:

Blade 1 - 307
Blade 2 - 313

Post Sharpening Sharpness:

Blade 1 - 584
Blade 2 - 127

Difference:

Blade 1 - (-277) 190% more force needed after sharpening
Blade 2 - (+186) 60% less force needed after sharpening
?

wickededge wrote:

The Wicked Edge sharpened knife is Knife #1.

Am I missing something here? I thought it was blade 2 that was the weps one... It looked like blade 1 had more steel removed in the sharpening process and required more force to cut something than the other...?

Josh
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Re:Re: A great selling point 5 months 2 hours ago #16860

  • razoredgeknives
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wickededge wrote:
:

Original Width:

Blade 1 - 1.818"
Blade 2 - 1.765"

Post Sharpening Width:

Blade 1 - 1.741"
Blade 1 - 1.764"

Change:

Blade 1 - 0.077"
Blade 2 - 0.001"

Initial Sharpness:

Blade 1 - 307
Blade 2 - 313

Post Sharpening Sharpness:

Blade 1 - 584
Blade 2 - 127

Difference:

Blade 1 - (-277) 190% more force needed after sharpening
Blade 2 - (+186) 60% less force needed after sharpening
?

wickededge wrote:

The Wicked Edge sharpened knife is Knife #1.

Am I missing something here? I thought it was blade 2 that was the weps one... It looked like blade 1 had more steel removed in the sharpening process and required more force to cut something than the other...?

Josh
The administrator has disabled public write access.
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