A ball bar is a precision instrument used to assess the geometric accuracy of a CNC machine by measuring its ability to move in circular paths. It consists of a rigid bar with precision balls at each end. One ball is magnetically attached to a cup mounted on the machine's spindle, and the other ball is magnetically attached to a cup mounted on the machine's table. The ball bar is essentially measuring the distance between these two points as the machine moves through a programmed circular path. As the machine executes the circular path....
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