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It is convenient and easy to calibrate the straight line on the milling machine because there is a coordinate workbench guarantee. However, the circular workpiece is on the milling machine, and it is more difficult to correct the center line of the workpiece on the center line of the milling machine spindle. Especially calibration in single piece production is often a hassle. The following is a set of simple tools for quickly calibrating round pieces. This set of tools is very simple in structure, easy to make, and has high precision. The upper and lower concentricity during production is easily guaranteed to be within 0.01 mm.