Here’s a robot hand which can be built using mostly hardware store items. It doesn’t have the strongest of grips, but it does have lifelike movement. The demonstration video shows it picking up small objects like a metal nut.
The image above shows the ring and pinky fingers of the hand beginning to flex. These are controlled by the servo motors mounted in the palm area. The skeletal structure of each digit begins with the links of a bicycle chain. The links are first separated by removing the friction fit rods. Each rod is replaced with a screw and a nut, which also allows the springs (which open the digits) to be anchored at each ‘knuckle’.
[Aaron Thomen] didn’t stop the design process once the hand was finished. He went on to build a controller which lets you pull some rings with your fingers to affect movement. This movement is measured by a set of potentiometers and translated into electrical signals to position the hand’s servo motors. The demo, as well as two how-to videos are embedded below.
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We know that there are already 3D printed hips and knees in use in the medical field, but it takes a story like this one to really bring home the idea of how this technology changes lives. 5-year-old [Liam] is missing parts of his right hand, and this open-source prosthetic hand has given him a jolt of increased function. The video clip after the break shows him on the third day with the device. He’s practicing picking up coins from a stack using the hand. Just $150 in parts, combined with the hard work and good nature of the developers, made this possible.
The design is available on Thingiverse. In addition to the 3D printed parts the prosthesis uses off-the-shelf hardware store items like bungee cord and fasteners. The tips of each finger and the thumb are given some flex and grip by covering each with a rubber thimble.
We love seeing this life-changing technology wielded by basement and garage hackers. Another great example is this scratch-built leg from last May.
Continue reading “3D printed prosthetic hand helps out for about $150”
He human hand is one of the most impressive pieces of machinery – biological, mechanical, or otherwise – that you’ll ever lay eyes on. With two dozen degrees of freedom, the hand can gently caress the most fragile flower petal without bruising it, or beat a hammer into an anvil with tremendous force. Simulating the human hand, however, is quite a challenge that requires dozens of servos and complex mechanical linkages. [Tomdf] over on Instructables is able to create hands, tentacles, and other weird biological contraptions using spring-loaded drinking straws and custom-made 3d printed joints.
[Tomdf] got the idea for drinking straw phalanges after seeing a few 3D printed drinking straw connectors meant to be used for creating 3D objects out of disposable plastic tubes. After designing a new spring-loaded joint for drinking straws, [Tomdf] is able to add a few lengths of thread to serve as ligaments to control the segments of drinking straws. It’s a similar setup to the horrible demon spawn we saw at Maker Faire last year, but far more extendable for any project that might pop into your head.
You can check out the drinking straw tentacles in action after the break.
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Jump scares are a lot of fun, but if you want to hold the attention of all those trick-or-treaters we’d suggest a creepy prop. One of the best choices in that category is a ghoulishly lifelike hand. You can draw some inspiration from this roundup of robot hands which Adafruit put together.
We’ve chosen four examples for the image above but there are more to be had than just these. In the upper left there is a laser-cut acrylic hand that actually features some force sensitive resistors on the fingertips to help implement some haptic feedback. This project was inspired by the hand seen in the lower right which uses flex sensors on a glove to control the bot’s movement. If you’re looking for something more realistic the 3D printed parts on the lower left are the best bet. But if you’re looking to put something together by Halloween night the offering in the upper right is the way to go. It’s hacked together using cardboard templates to cut out plastic parts and using polymorph to form joints and brackets.
Get your Terminator clichés ready, this robot hand reeks of Skynet. It is designed to function like the human hand, but the main goal is one of robustness. A lot of effort went into making sure this won’t break in the field. Instead of rigid gears, a system of tendons actuates each digit. The pulleys that control these are located in the forearm and each has a spring mechanism that helps to cushion shocks to the apparatus which might damage other grippers. It has bone-crushing power behind the 19 degrees of movement and, as you’ve already guessed, this comes at a pretty steep price tag; topping out around 100,000 Euros. It’s more complicated, and more expensive that jamming grippers, but it’s also far scarier. See for yourself in the silent movie after the break.
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Here at Hackaday, we love it when people make home brew versions of elaborate, expensive, and technical equipment. By gathering up some coffee grounds, a balloon, some plastic tubing, and his lungs, [Carlos] has provided a good how-to on making your own coffee grounds robotic hand. Inspired by the U. Chicago, Cornell, and iRobot Collaboration we previously covered, he is one robot and a vacuum pump away from having their setup. Check out his blog for a list of components as well as a couple hints to help the build go smoothly. Be sure to check out the video after the break.
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Inspired by the control system for the AMP suits in the movie Avatar, [Feelpavan] built this gesture controlled robotic hand. So far there is functionality for the wrists to rotate and bend, as well as for the fingers to flex (but not individually). This is accomplished by three servo motors on the hand assembly. The instructions for the hand are gathered from your own hand, through the use of an accelerometer and an Arduino that he built himself. Check it out after the break.
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