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Hand: open-source Robot Hand

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Re: Hand: open-source Robot Hand

#91

What jumps out at me is the $135 bill of materials. What a time to be alive!

Most hand related jobs upwards of $100 per 30 min If this Robot hand can do those jobs we could see some industries take a hit

> upwards of $100 per 30 min

That is why I'm self employed.

Re: Hand: open-source Robot Hand

#94

What jumps out at me is the $135 bill of materials. What a time to be alive!

It’s one of best designs I have seen, I admit. But for that price you cannot get absolute encoders outside the motor, reliable force/torque sensors (think picking up a strawberry), tendons (thread below). It might be too limited for research and real-world projects unfortunately.

Would adding AnySkin to the finger tips work? ( https://any-skin.github.io ) ?

Re: Hand: open-source Robot Hand

#96

Earlier quoted context omitted.

Most hand related jobs upwards of $100 per 30 min If this Robot hand can do those jobs we could see some industries take a hit

It took me a a distressingly long time to understand this comment. I'm kind of concerned, and have vowed to get out more.

[dead]

Re: Hand: open-source Robot Hand

#97

What jumps out at me is the $135 bill of materials. What a time to be alive!

It’s one of best designs I have seen, I admit. But for that price you cannot get absolute encoders outside the motor, reliable force/torque sensors (think picking up a strawberry), tendons (thread below). It might be too limited for research and real-world projects unfortunately.

[deleted]

Re: Hand: open-source Robot Hand

#98

Does anyone know what design considerations, if any, might've gone into deciding to have 4 fingers instead of 5? And what tradeoffs that entails? I actually saw this posted a few days back on Twitter and had been wondering if there was any deeper consideration for the number of fingers. It seems like you save around $10 in parts by getting rid of a finger, based on the information in the BOM.

Ignore the fact the hand is as thick as a servo motor, for now, and just consider the palm width.

This 4-finger hand is just below 4 inches wide, across the knuckles. By the standards of gloves for humans, this is already "X-Large"

The SCS0009 servos are 1/2in wide and there are two for each finger. Adding two more servos would make it 5 inches wide, taking it into "XXX-Large" territory.

Re: Hand: open-source Robot Hand

#99

What jumps out at me is the $135 bill of materials. What a time to be alive!

Most hand related jobs upwards of $100 per 30 min If this Robot hand can do those jobs we could see some industries take a hit

Search for ‘teledildonics’ on YouTube for one of the most entertaining and comprehensive Emacs courses you’ll find on the internet.

Re: Hand: open-source Robot Hand

#100
post #78
post #76

Earlier quoted context omitted.

Mold design is still difficult when the parts aren't dead simple. The software I've seen is okay with the simple stuff, but once you get even a little more complex you have to understand simultaneously how to design good parts for molding and how to design good molds, both of which are heavily dependent on the type of plastic you're using and the size of the press you have access to. Not to mention how to machine goo…

They're little linkage parts, mostly flat.[1] Some of those holes are bearings. None of those parts are hard to make, but they need to be strong. They could be made by CNC machining, or in quantity by injection molding, or stamping. But tiny working parts in 3D printed PLA will be too flimsy for that hand to do much work. Totally fixable problem. Then this hand can go to work. If this thing catches on, someone might…

I haven't looked too carefully, but I suspect those "needs to be strong" parts could mostly be cnc machined with an inexpensive hobby CNC like a 3020, from aluminiumn sheet/bar stock.
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