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Old 03-17-2020, 08:45 PM
000Robert
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How do you test the sharpness of your edge?



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I would like to know how yall test the sharpness of your blade edges. I have been slicing magazine pages. Sometimes I see if the edge will shave some hair off of my arm.
How do you guys test the sharpness of your blade edges most of the time? And what do you believe is the best way to test them?
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Old 03-18-2020, 02:16 AM
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I test by putting the edge against your finger nail at an angle to see if it slides, if it does, it is not sharp. Of course you want to be very careful. Try it with a new razor blade and you will see what I mean.
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Old 03-18-2020, 03:56 AM
000Robert
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Originally Posted by LuckyGuy View Post
I test by putting the edge against your finger nail at an angle to see if it slides, if it does, it is not sharp. Of course you want to be very careful. Try it with a new razor blade and you will see what I mean.
Oh yeah, I remember hearing about that way. About what angle would be the best? Do you use the same angle that you sharpen the edge at?
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Old 03-23-2020, 10:39 PM
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Originally Posted by LuckyGuy View Post
I test by putting the edge against your finger nail at an angle to see if it slides, if it does, it is not sharp. Of course you want to be very careful. Try it with a new razor blade and you will see what I mean.
I have been checking that out and I am not too sure about it. I have found some blade edges that will stick on my fingernail, but not slice magazine paper easily. But, every blade edge that will slice magazine paper easily, will stick on my fingernail.

So slicing magazine paper seems to be a superior test for blade edge sharpness over the fingernail method!
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Old 03-24-2020, 05:40 AM
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Originally Posted by LuckyGuy View Post
I test by putting the edge against your finger nail at an angle to see if it slides, if it does, it is not sharp. Of course you want to be very careful. Try it with a new razor blade and you will see what I mean.
That is the way my grandfather taught me to check fish hooks.
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Old 03-24-2020, 06:14 AM
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I see if it will shave the hair off my arm. All I need to feel, it the blade grab the first hair, and pull, and I know it will cut it all off.
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Old 03-24-2020, 07:23 AM
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The fingernail test shaving your arm even putting your knife up against a Bic ball point pen and seeing if it digs into the plastic all good ways to tell if a knife is sharp. If a knife is razor sharp it should be able to whittle hair .Run a piece of hair down the edge of the blade and see if it can split it that's how you know you have a razor sharp knife .Try putting a tomato on a table and seeing if you can slice through it with out holding it .If your knife can do that its razor sharp.
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Old 03-24-2020, 09:27 AM
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Originally Posted by LuckyGuy View Post
I test by putting the edge against your finger nail at an angle to see if it slides, if it does, it is not sharp. Of course you want to be very careful. Try it with a new razor blade and you will see what I mean.
Same way you test out fishing hooks
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Old 03-24-2020, 01:19 PM
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I wouldn't recommend this method....


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Old 03-24-2020, 01:41 PM
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I clean cod fish, if it last 8 fish it was a good edge.

If it doesn't hit at least 5 it was a bad edge.

Like cleaning sand paper fish.

That finger test looks un sustainable to me
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Old 03-24-2020, 01:45 PM
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I throw a small piece of silk into the air and slash it with the blade. If it cuts it then it is sharp.
https://www.youtube.com/watch?v=r2NtAuuEYwg

Last edited by JTJ; 03-24-2020 at 01:49 PM.
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  #12  
Old 03-24-2020, 06:52 PM
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Originally Posted by Gizzy View Post
I see if it will shave the hair off my arm. All I need to feel, it the blade grab the first hair, and pull, and I know it will cut it all off.
Exactly! If you have to press it into the flesh to get it to bite some hairs it isn't sharp enough.
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Old 03-24-2020, 07:30 PM
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Originally Posted by JTJ View Post
I throw a small piece of silk into the air and slash it with the blade. If it cuts it then it is sharp.
https://www.youtube.com/watch?v=r2NtAuuEYwg

Got in trouble when I did that. I wait for a fly to come by.
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Old 03-24-2020, 08:37 PM
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Got in trouble when I did that. I wait for a fly to come by.
Do you behead it, cut it in half, cut the wings off or castrate it?
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Old 03-24-2020, 09:36 PM
000Robert
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Originally Posted by Gizzy View Post
I see if it will shave the hair off my arm. All I need to feel, it the blade grab the first hair, and pull, and I know it will cut it all off.
Thanks, Gizzy! I have seen many people use that test. I have used it also but it is hard for me to stop at one hair. So I would have bald spots on my arm. I have also seen people lick and wet the hair first. I also agree with SavagePlinker that we should not have to press the edge on our skin.

But I enjoy slicing paper. And some edges seem to slice the paper grudgingly, and some slice through the paper like butter.

Eric, I would not recommend that method either. Ouch!
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