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Hand: open-source Robot Hand

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Re: Hand: open-source Robot Hand

#41

Post by seanthemon »

sroussey wrote: post #40
thrance wrote: post #34

Earlier quoted context omitted.

Tbh I would rather not have computer-guided knife-flinging arms in my home, be them on wheels or fixed to the wall.

I have a parrot (whose beak is sharp enough, thank you very much) that loves to grab a knife out of the knife block and spin around with it. I have to put a towel over it though today he pulled the towel off and still grabbed the knife and was holding it up when I turned around.

It's a well known fact that birds aren't real and you must be a target now.

Re: Hand: open-source Robot Hand

#42

Post by jimhi »

TechDebtDevin wrote: post #21
mft_ wrote: post #7

This looks like a nice, approachable robotic model of a human hand that can be printed and experimented with. But... is a human hand the best design for a robot to grip things with? Or could we surmise that the human hand evolved as a pretty good hand given the materials and senses that were available to evolve humans from , while in theory a totally different design might be optimal for gripping when constructed fro…

Would you prefer necrobotics!?! https://www.smithsonianmag.com/smart-news/scientists-use-dea... How long until human hands are put on robotics??

This is the craziest thing I’ve seen in awhile

Re: Hand: open-source Robot Hand

#44

Post by fusionadvocate »

stefanka wrote: post #15
fusslo wrote: post #9

Earlier quoted context omitted.

Huh, never thought of that I wonder if companies are experimenting with materials like UHMWPE for non-elastic, high strength-to-diameter tendons. I dont know if you'd have to weld the dyneema to the anchor points, though

Roboy used dyneema tendons if I recall correctly. Fluidic actuators is another option. IMO, additional sensors and sensor fusion are necessary but this will raise the costs and demand to control software significantly. We are researching humanoid robots for quite some decades now and these problems are easily underestimated (similarly to autonomous driving). I doubt we'll see them in our houses very soon.

The issue is not that these problems are easily underestimated, but that the researchers are very proficient at repeating the same mistakes over and over again.

Re: Hand: open-source Robot Hand

#45

Post by horsawlarway »

micromacrofoot wrote: post #26
mandeepj wrote: post #16

The bigger or biggest question is - how much weight it can lift? If we assume it can lift half a pound, then what changes it’d require to make it lift 10/20/30 pounds and so on?

hands hold, arms lift — a hand without an arm isn't going to have much strength

Yes, but this is "bring your own arm" so the person above you can easily build the arm out to whatever specs they'd like.

They probably want to know relatively important information like

- Breaking force (how much force will break a finger)

- grip force (How much force can the fingers exert to hold an object once closed)

- holding force (combination of grip force and material properties [ex - friction] that gives you an idea how much force can be applied to prevent slipping)

- closing force (How much force is exerted during closing [similar but distinct from grip/holding])

Or, with a lot less specific detail but still generally useful as a starting point...

- payload capacity (approximately how much can this safely manipulate)

Re: Hand: open-source Robot Hand

#47

Post by jjk166 »

mft_ wrote: post #7

This looks like a nice, approachable robotic model of a human hand that can be printed and experimented with. But... is a human hand the best design for a robot to grip things with? Or could we surmise that the human hand evolved as a pretty good hand given the materials and senses that were available to evolve humans from , while in theory a totally different design might be optimal for gripping when constructed fro…

Well we aren't all wearing mecha-claws to improve upon our feeble human design.

Re: Hand: open-source Robot Hand

#48

Post by beAbU »

mft_ wrote: post #7

This looks like a nice, approachable robotic model of a human hand that can be printed and experimented with. But... is a human hand the best design for a robot to grip things with? Or could we surmise that the human hand evolved as a pretty good hand given the materials and senses that were available to evolve humans from , while in theory a totally different design might be optimal for gripping when constructed fro…

The human hand is arguably the best general purpose gripper of human-scale objects. Only took evolution a couple of hundred million years to figure it out.

If you can limit the scope of things to be gripped, e.g. a sheet of paper, a baby chicken or a 100x100mm square steel girder then no doubt there is a better design out there.

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