You favorite sharpness test media ?

  • Thread starter Thread starter RH
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RH

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I work in the technology field, and get lots of trade periodicals mailed to my office. A lot of them come in clear plastic “envlopes”. Over time, after using different knives to slot open the plastic, I began to notice a difference in how they opened. Some opened smooth & straight – nice. Sometimes the blade would drag and rip the plastic – not so nice.

I now use this plastic as my sharpening benchmark. I save the plastic, and when I sit down (with my trusty Sharpmaker 204) to sharpen a knife, I use the plastic as my test media. Clean cuts without dragging or snagging the thin plastic are the first step to sharp. When the knife will glide down through the 2 layers of plastic on only it’s own weight as I lightly hold the end of the handle – then it’s sharp enough!
 
I'd have to go with junk mail. You can tell a good bit about the sharpening job on your knife by how well it slices through yet another credit card offer or long distance carrier sales plea.

 
Leg hair. Only because I'm completely out of arm hair until some grows back.
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Mountain dew cube or 12 pack boxes.

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My thumbnail. It's still a pretty good quick test, just gently lay the edge on your thumbnail and try to move the blade sideways.
It should "bite in" and resist movement.

No, Johnny, you dont wanna cutcha thumb off....
 
Cigarette paper, shaving, and manilla rope are all things I use to check for sharpness. The trick is consistancy. Same brand of paper, same thickness rope.
 
For real working knives, I use the hardest poly rope I can find. The edge has to have both the right geometry and a good finishing grit to cut through it well.

I also do a quick arm-shave. I expect my coarse slicers to be able to shave hair, my pocket razors (read: Calypso Jr., and other thin-edged small folders) to be able to cut it with minimal pulling or effort.

Joe
 
Skin (once again
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), toilet paper.

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"Peace is not without conflict; it is the ability to cope with conflict" - Leo Giron
 
I use junk mail and on occasion cardboard. Shaving fur off of kittens works well if you're out of either of these two.
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Ken
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"Forgive your enemies, but never forget their names." - John F. Kennedy
 
My ultimate is the "Free Hanging TP" test.
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With your non-dominant hand hold a length (12") of toilet paper (preferably super soft Charmin) out in front of you and allow the TP to "free hang". Then, using a snap cut, strike the lowest segmant of TP.
*Note#1-Please watch that you don't test your edge on your non-dominant hand while performing this test.
*Note#2-If you do test your edge on your non-dominant hand then use the remaining TP to soak up the extruded bodily fluid.
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If your knife is truly super sharp then it will wisp right on through the TP. If you snag & rip the TP then your back to the stone & hone.
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--The Raptor--
 
paper and arm hair...
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Sam

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<font face="Verdana, Arial" size="2">Originally posted by Buzzbait:
Leg hair. Only because I'm completely out of arm hair until some grows back.
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</font>

Be careful with that - it looks really wierd to have patches of leg hair missing. I did it for a while, until my girlfriend started making fun of me, and wouldn't let me wear shorts.
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-- Rob

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Me fail english? That's unpossible!
 
I use news paper, T.V. guide listings paper also works good. When the knife will shave through it with it's weight, and a slight push, I'm happy! RKBA!
 
<font face="Verdana, Arial" size="2">Be careful with that - it looks really wierd to have patches of leg hair missing. I did it for a while, until my girlfriend started making fun of me, and wouldn't let me wear shorts. </font>
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I have them (patches of hairless skin) on my thigh .. luckily, no one notice LOL!

If this runs out, then it is my arm hari
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Seriously, I test it by shaving using it (dry without soap or anything)
 
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