On this Sunday where Spain played Euro, I leave an impressive project of a robot arm by Moyin reused parts of Mexico with printers and a methacrylate base. Unfortunately he has not posted any video but shows in detail with many pictures all the parts of the arm. This type of project is always impressive because we can highlight the use of stepper motors that are much more accurate than the servo motors generally used in such projects. Discuss also the problem of the weight of the structure, which gave enough problems since the torque of the engine is limited. He solved a very elegant way of adding springs to reduce the mechanical force exerted on the shaft.
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