What happens when you “oops”? All the way through the bone?

phailhaus 11 hours ago | parent | next [-]

He specifically says it's not a lightsaber, and when he's cutting the tomato you can see he does have to apply force for it to go through. He compares it to an ebike, where it makes cutting easier but it's not magic.

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DennisP 13 hours ago | parent | prev | next [-]

Same as a really sharp knife. In general though, dull knives are more dangerous. You have to cut with more pressure and they're more likely to slip.

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pkulak 13 hours ago | parent | next [-]

There must be a limit though. Surely a light saber is not more safe than a dull knife.

	▲	cjbgkagh 12 hours ago \| parent \| next [-]
		If you’re used to sharp knives then it’s probably safer than applying more pressure which could yield in surprising ways. Getting used to it is the dangerous part, especially if not forewarned or the user doesn’t heed the warning. Lightsaber would be different because doesn’t have a blade to guide.
	▲	kulahan 11 hours ago \| parent \| prev \| next [-]
		Not really. The dangerous aspect of a knife is when it moves unexpectedly. The sharper it is, the harder it is to create a scenario where it jumps on something particularly dense, like when a saw hits a knot in a tree. If you’re pushing down with hard force, it basically doesn’t matter if the knife is sharp anymore, it’ll just chop your finger off. However, with an extremely fine cut, it will be much easier to reattach, as the edges will match up well. With a dull knife, you’re not slicing, you’re more tearing your way through something.
	▲	arp242 6 hours ago \| parent \| prev \| next [-]
		It's not my impression that if you make a knife very very sharp it turns in to a lightsaber.
	▲	kmoser 7 hours ago \| parent \| prev \| next [-]
		Actually, a light saber is 100% safe since it doesn't exist.
	▲	beeflet 10 hours ago \| parent \| prev [-]
		Imagine how dangerous a dull lightsaber would be

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omnicognate 12 hours ago | parent | prev [-]

You say this from any special knowledge or is it just your opinion from the video? Looks to me like it will go through your flesh and bone like they're not there, in a way even a razor sharp knife won't.

Also, while it's true that dull knives are in some ways more dangerous than properly maintained ones, that doesn't mean safety increases monotonically with sharpness. I sharpen my kitchen knives every weekend and I'm perfectly capable of achieving an edge I could comfortably shave with, but I deliberately don't (I skip the highest-grit step and leather stropping needed for that) because it's not optimal for the vast majority of cooking tasks. The only thing that happens regularly in my kitchen that needs razor sharpness is scoring the top of a sourdough loaf, and my wife uses actual razor blades for that.

This strikes me as more of a competitor to electric carving knives than something I'd want to replace a standard chef's knife with. It looks like it needs to be used with very great care.

	▲	SilverElfin 11 hours ago \| parent [-]
		Medical bone cutting knives are ultrasonic. I assume this one has a duller edge than those though.

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amacbride 13 hours ago | parent | prev | next [-]

Subsidized by Big Hook, no doubt.

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kakabelo3 9 hours ago | parent | prev [-]

It is indeed more dangerous than a regular knife.