CONSTRUCT & CREATE Hydraulic Robot Arm

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Present the portfolio of marked-up drawings, the finished arm, and demonstrate the arm to the class. The hydraulic system works on the principle of Pascal’s law which says that the pressure in an enclosed fluid is constant in all directions. As the pressure in the system is the same, the force that the fluid gives to the environment is consequently equal to pressure × area. Conclusion: Post-Activity Assessment: Evaluate the student project using the attached Hydraulic Arm Rubric, with criteria on research, imagining-planning-improving, creativity, written or oral sharing, and how the mechanism meets the challenge.

In space, the Canadarm and its successor Canadarm2 are examples of multi degree of freedom robotic arms. These robotic arms have been used to perform a variety of tasks such as inspection of the Space Shuttle using a specially deployed boom with cameras and sensors attached at the end effector, and also satellite deployment and retrieval manoeuvres from the cargo bay of the Space Shuttle. [6] Identify appropriate materials, tools, and machines needed to construct a prototype of a given engineering design.Can’t Help Myselfwas commissioned by the Guggenheim for the 2016 exhibition “Tales of Our Time,” and in addition to the giant robotic arm, the liquid substance, and the polycarbonate wall containing them, the piece also contains some less visible elements: visual recognition sensors that can detect the movement of the colored water (which is not blood, contrary to what it seems). When the liquid pools too far away from the arm, it will scoop up the substance. Periodically, the liquid is sprayed across the walls, hinting at carnage and unseen violence. Test the prototype. TRY TO MAKE IT FAIL. What do you have to do to get it to fail? Can you redesign it to prevent that from happening? Make your design the best it can be. (Students like to make their designs fail. They understand that as an instruction and see it as a good mindset for testing prototypes.) Research the engineering design process and answer the questions on the Investigating Pneumatics and Hydraulics Systems Student Handout. Spherical robot / Polar robot: Used for handling machine tools, spot welding, die casting, fettling machines, gas welding and arc welding. It is a robot whose axes form a polar coordinate system. [3]

Develop a portfolio (a collection) of sketches that attempt to solve the problem. Share with the entire design team. Upon identifying a promising design, brainstorm with the next design team about attaching them together. Critique (be nice, constructive) the designs and make a short list of pros (+) and cons (-) for each idea. Identify the best ideas and vote to decide upon them. Part 2 – Creating the hydraulic arm: three 40-minute classes (This activity can be done in fewer class periods, but giving students this amount of time enables them to test numerous design ideas and further understand the engineering design process and the underlying concepts.) The "gripper body" should not have 2 holes, there should be 1, but who ever made the template put two. (because if you use copper wire and put it through both the gripper arms and the body, it won't move)

A serial robot arm can be described as a chain of links that are moved by joints which are actuated by motors. An end-effector, also called a robot hand, can be attached to the end of the chain. As other robotic mechanisms, robot arms are typically classified in terms of the number of degrees of freedom. Usually, the number of degrees of freedom is equal to the number of joints that move the links of the robot arm. At least six degrees of freedom are required to enable the robot hand to reach an arbitrary pose (position and orientation) in three dimensional space. Additional degrees of freedom allow to change the configuration of some link on the arm (e.g., elbow up/down), while keeping the robot hand in the same pose. Inverse kinematics is the mathematical process to calculate the configuration of an arm, typically in terms of joint angles, given a desired pose of the robot hand in three dimensional space. Most hydraulic drive systems make use of hydraulic cylinders. Here, the same principle is used. A small torque can be easily converted into a large force just by throttling the fluid between the generator and the motor, or with the use of some hydraulically operated pumps and/or motors that have an adjustable swept volume, the ratio of the transmission can be changed and thus adjusted very easily. In case throttling is used, the efficiency of the transmission is limited in most cases.