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[Thread] Mental Math (mander.xyz)

submitted 1 week ago by [email protected] to c/[email protected]

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[–] southsamurai 23 points 1 week ago (1 children)

I mean, most people do it across, rather than along the blade, what with the necessity of detecting a burr, which can't usually be felt length wise. You slide along the blade, and it is sharp, if you screw up you get cut.

That doesn't take away from what you're saying, it's very true, no matter which direction you're feeling. Just normal, average fingertips can pick up stuff like that, that you'd need a microscope to see. It's a trip!

[–] [email protected] 10 points 1 week ago (1 children)

The burr is also detectable lengthwise. When starting with a dull blade it feels smooth while sliding fingers lenghtwise. When the burr is formed, it starts to feel rough. When it feels like it's digging into skin, it's sharp. It's a very subjective thing though, everybody has different fingers.

[–] [email protected] 4 points 1 week ago (1 children)

Is way better to draw your finger perpendicular to the edge to feel the burr. That way you don’t cut yourself on the edge or the burr itself.

[–] [email protected] 1 points 1 week ago

This is how I was taught as a kid.