These computer numerically controlled (CNC) jig grinding machines are most commonly used to finish grind different size bores or holes in a flat workpiece in any pattern or in any sequence. The workpiece is usually horizontally mounted on the machine and the grinding spindle is usually arranged vertically. This type of machine can be programmed to precisely grind a multitude of holes in a random pattern in relationship to one another. Programs can be generated at the machine or at a remote station and saved for future use.