Shakerbot Leverages Inertial For Locomotion

June 7, 2012 by Mike Szczys 15 Comments

This robot uses the concept of a snakeboard for getting around. [Sevag Babikian] built the project, and has gone out of his way to explain how it works.

We’d recommend skimming over his explanation, but it was the video after the break that made all things clear to us. There is a large fly-wheel at the center. This is not continuously rotating, but oscillates a few inches in either direction. This inertial change shifts the center of gravity for the entire frame, causing motion. By oscillating the front and rear axles at the appropriate time the beast can move forward in a surprisingly straight line.

It’s doing this with just three motors. [Sevag] speculates that with further testing and refinement this could be a very efficient way to move the bot around. We have our doubts about that, but we are mesmerized by the undulations and how well they really do propel the thing along.

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[Easton’s] Robot Arm Takes 2nd Place In The International Science And Engineering Fair

June 2, 2012 by Mike Szczys 13 Comments

Here we see [Easton LaChappelle] getting a congratulatory handshake from the robotic arm he built. This project is aimed at human prosthetics, and we’re happy to report that [Easton] won second place in Electrical and Mechanical engineering division of this year’s International Science and Engineering Fair (PDF listing the winners).

In the video he gives us a great look of the state of the project. Since we checked in with him last he’s added a body for the arm to mount to. The arm now has shoulder movement, which uses geared DC motors along with some potentiometers for orientation feedback. For the elbow he wanted to have the same setup but ran into trouble mounting the potentiometer. His solution was to use some shapelock to mold a bracket (shapelock is the plastic you melt in water to form any shape). In addition to the aforementioned joints, the wrist, fingers, and hand have all seen improvements in how they are supported and in their performance.

We think this is amazing work for anyone, especially a 16-year-old High School student. Great job [Easton]!

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Shoulder Robot For The Forever Alone

June 2, 2012 by Mike Szczys 46 Comments

Don’t have anyone to share activities with? Forget Siri, she’s just a disembodied voice in a box. You need to get yourself a shoulder-mounted robot pal.

The idea behind this design actually has something to do with telepresence. Let’s say you and your best friend want to go check out the local Hackerspace. The problem is that you met your best friend on the Internet and they live thousands of miles away. Well just strap on your shoulder robot and have your friend log on. There’s a camera to give him or her feedback, and twenty degrees of freedom lets them control the torso, arms, and head of the bot in a realistic and creepy way. This works much like a marionette, with motors pulling wires to actuate the robot’s movements. You can get a very brief look at this in the clip after the break.

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Robot Arm Provides Haptic Feedback From The Virtual World

May 31, 2012 by Mike Szczys 2 Comments

[Diego] wrote in to let us know about the haptic feedback arm project with which he’s hard at work. He calls it the Vimphin, which is uses the beginning letters from the words: Virtual Manipulator Physical Interface. Instead of a claw, the robot arm has a hand grip that lets you easily move it around. That is unless the virtual model of the arm encounters a dense substance, and then it’s going to be more difficult to move.

The test arm seen above includes several high quality robotic servo motors. You probably know that servo motors have feedback circuits that let them sense their position, and this is what is used to detect when a user moves the arm. This movement is tracked in the virtual 3D environment seen on the screen. In this case, the base of the robot is sitting in a pool of water. When the end of the virtual arm is in open air it’s pretty easy to move. When it dips below the water line the motors are used to increase resistance, simulating movement through a denser substance.

This sounds like a great piece of hardware to have around when the OASIS is finally developed.

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CalTech’s Manipulator-arm Equipped Robot

May 30, 2012 by Mike Szczys 3 Comments

[Justin] wrote in to tell us about the rover which his CalTech team has entered in NASA’s Exploration Robo-Ops Competition. Their time to shine is later this week, but you can see some of the test footage after the break.

The operator pictured above is using a controller which is a scale model of the manipulator arm, with two cameras giving feedback. One of those monitors shows a feed from the arm itself, providing a view of the gripper. The other feed is a wide shot of the working area from the body of the robot. The arm has six degrees of freedom actuated by servo motors. The controller is a replica of the arm laser cut from acrylic. At each joint there’s a potentiometer whose value is used to establish the position of the frame.

At first we thought that this would be more fatiguing and less convenient than using a gaming controller. But as we look at the dexterity of the arm it becomes obvious that joysticks and buttons would just make things more difficult.

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Climbing Robot Glues It’s Own Feet To The Wall

May 29, 2012 by Mike Szczys 8 Comments

The problem of gripping all surfaces has always plagued the field of climbing robotics. But if you don’t care about damaging the wall, why not just let the robot glue its feet to the surface. That’s exactly how this robot does it, using a couple of climbing feet in conjunction with a hot melt glue gun wielding arm. It seems to be a predecessor of the hot glue 3D printing robot which we saw last week.

Check out the video to get a full overview of the climbing process, but here’s the gist of it. The legs and arm are able to pivot around the central axis of the robot, parallel to the climbing surface. Once one leg is glued in place the robot swivels around it so that the body is directly above that leg. From there it reaches up with the arm to deposit some glue on the wall, then moves it out of the way so the other foot can be pressed against the hot adhesive. When the newly attached foot has cooled sufficiently, the lower foot is reheated to free it from the wall. At this point the whole process repeats.

We’re still fond of vacuum-based climbers like this parachute-equipped robot. But the design of the hot-glue arm on this guy is something that might make it into one of our own projects someday.

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An Arduino Based Quadruped Robot

May 27, 2012 by Jeremy Cook 6 Comments

Sure, we see hexapods all the time at [HAD], but moving around with four legs can be more tricky kinematics-wise. This Instructable shows you how to make one out of balsa wood.

Although one might not think of balsa to make their robot out of [vexedpheonix] explains that this was chosen because it’s extremely light and easy to work with. Since he was trying to keep costs down, the cheapest servos available were used. These weren’t all that powerful, so the lighter the body the better! According to the included bill of materials, he was able to keep the entire robot build under $100.

According to the article, the hardest part was making four copies of the same leg. We might suggest using a CNC router, but building one would obviously add a huge layer of complication to the project!

Thanks for the tip on this one [SteveT]! Be sure to check out the video of this little robot waving one of it’s legs or trying to walk after the break! Continue reading “An Arduino Based Quadruped Robot” →