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alloys aluminum amps antenna arena autonomous autonomous robots Basic Stamp battery types BattleBots belt Bob Gross bot’s build channel circuit clamp bot combat robots competition contest courtesy damage Deadblow detect detector diameter drill drive motors drum electric electronic speed controllers Equation fasteners FIGURE flip frequency friction front gear gearbox Grant Imahara H-bridge hammer heat hobby holes impact inches infrared input inside internal lift lifter machine match maximum metal microcontroller mini sumo motor controllers motor speed mounted opponent opponent’s output pounds pulse pulsout pushing R/C servo R/C system radio control relay require robot builders robot combat robot sumo Robot Wars Robotica screw sensor servo shaft shows signal spear spinning sprocket stall steel sumo bots sumo class sumo ring switch thwack bot torque transistor transmit turn Vantec vertical spinner voltage Voltronic volts weapon wedge weight welding wheels wire