[Chiprobot] has created an amazing compliant gripper. Designing robot hands (or end effectors) can be a perilous task. It is easy to give robots big, good, strong hands. Strong grippers have to be controlled by sensors. However, sensors can’t always be relied upon to ensure those hands don’t crush anything they touch. Hardware fails, software has bugs. Sometimes the best solution is a clever mechanical design, one which ensures a gripper will conform to the object it is gripping. We’ve seen “jamming” grippers before. (so named for their use of a granular substance which jams around the object being gripped).
[Chiprobot’s] gripper is something entirely different. He designed his gripper in blender, and printed it out with his Ultimaker 3D printer. The material is flexible PLA. Three plastic “fingers” wrap around the object being gripped. The fingers are made up of two strips of printed plastic connected by wire linkages. The flexible plastic of the fingers create a leaf spring design. The fingers are attached to a linear actuator at the center point of the gripper. The linear actuator itself is another great hack. [Chiprobot] created it from a servo and an empty glue stick. As the linear actuator is pulled in, the fingers pull around any object in their grip. The end result is a grip strong enough to hold an egg while shaking it, but not strong enough to break the egg.
We would like to see the gripper gripping other objects, as eggs can be surprisingly strong. We’ve all seen the physics trick where squeezing an egg with bare hands doesn’t break it, yet squeezing an egg while wearing a ring causes it to crack much… like an egg.
Continue reading “Compliant Robot Gripper Won’t Scramble Your Eggs”
[Sarah Petkus] has a simple dream. She wants to build and command her own delta robot army. It all began with an illustration she drew of a woman hovering over a field of flowers. The flowers in this case had incandescent light bulbs as blooms. [Sarah] decided to create her image in the real world as an interactive art installation. Her first attempts at moving light flowers were based on a pulley system, which was unreliable and not exactly the graceful movement she imagined. Eventually [Sarah] discovered inverted delta robots. She changed her flower design to a delta, and began building her own delta robots out of parts she had around the house.
A chance meeting with the folks at SYN Shop hackerspace in Las Vegas, NV kicked the project into high gear. [Sarah] switched from using R/C ball links as joints to a simple ball bearing joint. She created her entire design in CAD software and printed it on the hackerspace’s 3d printer. She now has six working prototypes. The robots are all controlled via I2C by an Arduino compatible Nymph board. Six robots doesn’t exactly constitute an army, so [Sarah] had to find a new way to fund her project. She’s currently setting up a project for Kickstarter. [Sarah] will be selling kits for her robots, with the proceeds going toward the realization of her dream of a field of robotic light bulb flowers – Assuming the deltas don’t become sentient and try to take over the world first. [Sarah] posts progress updates to her blog, and has a dedicated site (which we featured on Sunday as part of a Links post) for information about her upcoming Kickstarter campaign.
Continue reading “Build and Control Your Own Robot Army”
Back at New York MakerFaire 2012, we noticed an amazing little steampunk quadruped robot walking around in the crowd outdoors. The robot was amazingly well executed, and had a unique ability to draw children over with it’s puppy like animations. It turns out this is [Drew’s] Little Walking Robot (AKA Puppy Bot).
Puppy Bot has actually been around for quite a while. He was born from the spare parts [Drew] had left over after competing in Robot Wars and Battlebots. The robots in these competitions were often controlled by Radio Control plane or car transmitters. Most of these systems are sold as packs for an RC car or plane. In addition to the transmitter and receiver, the pack usually included a battery and 3 or 4 servos. Standard RC servos were much too weak for use in battle robots, so they remained in his parts box.
On what [Drew] calls a slow weekend, he started putting the servos together, and ended up with a basic robot that could crawl around the room. After that the robot took on a life of its own. [Drew] improved the battery system, and added a microcontroller to automate the various gaits and animations. He brought the robot along with him to one of his battlebot competitions, and it took home the “Coolest Robot” award – even though it wasn’t actually competing!
Continue reading “Quadruped Robot Thinks it’s a Puppy”
[Boston Dynamics] has been just full of videos over the last few days. They’ve dropped updates on Atlas and LS3 in addition to the WildCat update we already featured.
This video shows updates to the Atlas robot. This is to be a simplified version of the atlas, as compared to the robots sent off to competitors in the DARPA robotics challenge. Arms have been replaced with weights. It appears that this update focuses on Atlas’ balancing and handling on rough terrain. Atlas walks gingerly, over some crushed cinder blocks – possibly the same ones we saw BigDog throwing around recently. There are a few tense moments, but Atlas manages to get through unscathed.
The real scary part (for us) is watching Atlas get hit with a weighted ball. We’re assuming the 20 on the ball indicates pounds. Imagine getting hit from the side with a 20lb swinging weight. Would you be able to stand up? Did we mention Atlas did this all while standing on one foot? Atlas takes it in stride though – waving its arms to maintain balance in a very human manner. Notable is the balance system. Atlas never lifts its foot off the ground. This is slightly different from the bouncing/hopping system of balance we’ve come to know and love in [Boston Dynamics’] other robots. Continue reading “Atlas Survives the Wrecking Ball”
Take three industrial robots, two 4’ x 8’ canvases, and several powerful video projectors. Depending on who is doing the robot programming you may end up with a lot of broken glass and splinters, or you may end up with The Box. The latest video released by the creators project, The Box features industrial robots and projection mapping. We recently featured Disarm from the same channel.
The Box is one of those cases of taking multiple existing technologies and putting them together with breathtaking results. We can’t help but think of the possibilities of systems such as CastAR while watching the video. The robots move two large canvases while projectors display a series of 3D images on them. A third robot moves the camera.
In the behind the scenes video, the creators revealed that the robots are programmed using a Maya plugin. The plugin allowed them to synchronize the robot’s movements along with the animation. The entire video is a complex choreographed dance – even the position of the actor was pre-programmed into Maya.
Continue reading “Step into the Box”
[Malte Ahlers] from Germany, After having completed a PhD in neurobiology, decided to build a human sized humanoid robot torso. [Malte] has an interest in robotics and wanted to show case some of his skills.The project is still in its early development but as you will see in the video he has achieved a nice build so far.
A1 consists of a Human sized torso with two arms, each with five (or six, including the gripper) axes of rotation, which have been based on the robolink joints from German company igus.de. The joints are tendon driven by stepper motors with a planetary gear head attached. Using an experimental controller which he has built, [Malte] can monitor the position of the axis by monitoring the encoders embedded in the joints.
The A1 torso features a head with two degrees of freedom, which is equipped with a Microsoft Kinect sensor and two Logitech QuickCam Pro 9000 cameras. With this functionality the head can spatially ”see” and ”hear”. The head also has speakers for voice output, which can be accompanied by an animated gesture on the LCD screen lip movements for example. The hands feature a simple gripping tool based on FESTO FinGripper finger to allow the picking up of misc items.
The Robotic Manta Ray codenamed MantaBot created by the Bio-Inspired Engineering Research Laboratory (BIER Lab) is set to make a splash. The next evolution in underwater Robotics is here. We have seen the likes of robotic fish and Jelly fish now to be added to the school is the MantaBot which has been designed to mimic the unique swimming motion of the Manta Ray,
This biologically inspired under water robot’s has been designed with a primary goal to be autonomous using its onboard electronics to make its own decisions to navigate its watery domain. BIER Lab has received major funding from the Department of Defense (DoD) Multi-disciplinary University Research Initiative (MURI) program. Part of its goal in the long run is to reverse engineer the biological systems of such creatures to the point of creating simulated artificial skin and muscle.
Continue reading “Robotic Manta Ray (Mantabot)”