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Delta Robot is one of Parallel Robot: Parallel robot uses several serial chains to support a single platform, or end-effector. The end effector (hand) of this linkage (arm) is directly connected to its base by a number of separate and independent linkages working simultaneously. A Parallel robot arm is designed so that each chain is usually short, simple and can thus be rigid against unwanted movement. The off-axis flexibility of a joint is also constrained by the effect of the other chains. Errors in one chain's positioning are averaged in conjunction with the others. A further advantage of the Parallel robot arm is that the heavy actuators may often be centrally mounted on a single base platform. This reduction in mass along the arm permits a lighter arm construction, thus lighter actuators and faster movements. This centralisation of mass also reduces the robot's overall moment of inertia. A drawback of Parallel robot arm is their limited work space. Another drawback of Parallel robot arm is their nonlinear behavior: the command which is needed for getting a linear or a circular movement of the end-effector depends dramatically on the location in the work space and does not vary linearly during the movement.
Hanso posted a topic in LEGO Mindstorms and RoboticsWhen I was building the Robot Arm (see my mail thread here), I stumbled upon the ABB robot flex picker (also known as a delta robot). I was amazed about the simple construction and how fast it can work. Although I am definitely not making the first one of Lego, I wanted to build my own version of it. In this thread you can follow the work in progress. I have now build the base and the three arms that will support the grabber. The grabber will be able to pick up the candy containers and move them to a different location. Don't know yet what its place will be on the layout, but I am confident that it will have its use. Photos can be found at Flickr, click on the picture below to see some more pics and an animated gif. Please let me know that you think of it. Enjoy, Hans