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Thread: Testing Sharpness

  1. #1
    Senior Member Mucho Bocho's Avatar
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    Testing Sharpness

    I'm sorry if this topic has been covered already but in an initial search, I did not see any one single thread, so here goes.

    I'd like to get everyone's feedback on testing the sharpness of a knife. I've seen those paper cutting machines and all that but I want to know about a non-edge-damaging at home by hand method.

    The ones I know:
    Favorite:
    Dropped grape tomato on blade facing up at 12 inches. Should cut and hold tomato.
    M. Carters three finger on blade slide (least that's where I learned it).
    Arm hair shave in the direction of the hair

    Others:
    Paper shave--I feel this damages the edge I just crated
    Finger nail slide--this gives me the chills and large gouges in my finger nails.

    I'd really like to hear from the guys that are actually hand forging blades. I have to believe that you have a favorite tested edge sharpness test?

  2. #2

  3. #3
    Senior Member Cadillac J's Avatar
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    Cut stuff you would normally cut. NO better way.

  4. #4
    Senior Member Seth's Avatar
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    What paper does for you is tell you about any micro chips that you might not otherwise feel; it snags a bit.
    Everywhere you go, there you are.

  5. #5
    Just don't brutalize your fingernails like that guy on youtube.

  6. #6
    I find that paper slicing & push-cutting does help me get a sense for where my edges are at - there's a roughness and smoothness element, as well as the "this part isn't push cutting yet" thing.

    As Jarrod pointed out though, there's really no better test than actually cutting what you would cut with the knife.
    Len

  7. #7
    The alleles created by mutation may be beneficial


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    Like others said I use the paper test for figuring out if there are any spots I missed, usually there are. It's especially useful if you do sectional sharpening.

    Other than that a quick hash (some potatoes, onion, maybe some garlic and pepper) and you've got a pretty good idea of where the edge is.

  8. #8
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    Recently i've been putting a bit of TP on the cutting board and slice it with a little over blade weight only, bits of burr will catch and rip it and if the edge isn't there it'll just glide over.

  9. #9
    Quote Originally Posted by TB_London View Post
    Recently i've been putting a bit of TP on the cutting board and slice it with a little over blade weight only, bits of burr will catch and rip it and if the edge isn't there it'll just glide over.
    That's a new one to me---sounds useful.

  10. #10
    Senior Member Benuser's Avatar
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    +1. I'll give it a try!
    Another test: the finest cigarette paper you may find.

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