A lot of researches studies robot arms and the ability of controlling it to track targets which depends on the type of motors used, DC motors or servo motors. In addition to response time that DC and motor can give as a physical structure. Robots consists of number of junctions built of solid materials (robot arms( connected together by motors and the total structure lets the robot to move, these robots can be used in places that humans cannot act inside it or in places which we need a lot of repeated actions. This search aimes to study the robot arm movement by controlling the motors and its response to a drawn line using a PID controller to achive the most accuracy by using the distrubushion constants of the camera lens which used by the robot to see. All the cameras need to be calibrated and the constants used to move the robot in X,Y,Z.