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3 axis gantry crane robot

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this is a 3 axis gantry crane robot prototype. It uses a Click PLC with an Arduino UNO sbc. the actuators are stepper motors (no encoder) and proximity sensor switches to sense end-of-travel for the ball screws. the system will be used for material handling of various mfg. parts. the final step will be to install a ball screw for the third (Z axis).