Is this a case of a good design gone wrong in the build phase? Or is this DIY prosthetic arm a poor design from the get-go? Either way, [Will Donaldson] needs some feedback, and Hackaday is just the right place for that.
Up front, we’ll say kudos to [Will] for having the guts to post a build that’s less than successful. And we’ll stipulate that when it comes to fully articulated prosthetic hands, it’s easy to fail. His design is ambitious, with an opposable thumb, fingers with three phalanges each, a ball and socket wrist, and internal servos driving everything. It’s also aesthetically pleasing, with a little bit of an I, Robot meets Stormtrooper look.
But [Will]’s build was plagued with print problems from the start, possibly due to the complex nature of the bosses and guides within the palm for all the finger servos. Bad prints led to creaky joints and broken servos. The servos themselves were a source of consternation, modified as they were for continuous rotation and broken apart for remotely mounting their pots in the hand’s knuckles. The video below relates the tale of woe.
There’s a lot to admire with [Will]’s build, but it certainly still has its issues. He’s almost to the point of other more successful DIY hand builds but just needs a little help. What say you in the comments line? Continue reading “Fail of the Week: Good Prosthetic Hand Design Goes Bad”
Touched is a project by [Rebecca Strauss] that integrates servos, strings, and felt into a horrifying kinetic sculpture made up of a dozen mechanical fingers straight from a Boschian nightmare.
The fingers are made up of segments of wood articulated with the help of a small string. Each pair of fingers is controlled by a single servo, and the tips of each pair of fingers is controlled by a second servo.
After covering them in felt, [Rebecca] wrapped conductive thread around each of the fingers. When some of the fingers are touched, they all recoil as if controlled by a demon living just under a mountain of felt.
[Rebecca] brought in another kinetic sculpture using her servo controlled fingers; in the video up at the top and after the break, you can see the inner workings of this floor-mounted version. When the IR proximity sensor goes off, the fingers recoil but can be coaxed out again by gently stroking one of the phalanges.
Continue reading “Whatever a phobia of fingers is called, this is it.”
[Mazvydas] shares with us, his cheap robot hand. He was inspired by this project, where someone used an Arduino and a glove with some flex sensors to control a pre-made hand. He wanted to go a little more DIY though. He chose a picaxe microcontroller and constructed the hand himself out of twine, some plexi-glass, and some rubber hose. He does ultimately plan on adding glove control as well.
Unfortunately there’s no schematic or source code. Maybe if we ask really nicely he’ll share.
Continue reading “Cheap robotic hand”
We’re filing this one under “best interface implementation”. This robot is controlled by finger gestures on the surface of an iPod Touch. It can walk forward, turn, sidestep, jump, and kick a ball based on the input it receives from your sweaty digits. Unlike vehicles controlled by an iPhone (or by Power Wheels), this has some potential. Especially considering the inevitable proliferation of multi-touch devices in our everyday lives.
The race for the next revolutionary input design is an ongoing event. [Clayton Miller’s] newest offering in the contest is a multitouch concept that separates the display from the screen and is meant to utilize all fingers. His video explanation includes a description of the physical input device, a software implementation, and a demonstration of how a finished system will work. After the break we’ll look at the hardware, the software, and the concept video. Continue reading “10gui: multi-touch for all ten digits”