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Drill collar spiral milling machine is the specialized cnc machine tool for milling drill collar, use three milling cutters cut the mutual 120degree spiral groove of drill collar at the same time. X1, X2, X3 moving are controlled by CNC system and servo motor. With 3-jaw chuck, self-centering, whether pipe diameter how to change, the center keeps constant. Use 6sets idler wheel support and clamp workpiece, reduced the resistance of C axis, and increased the rigidity of clamps.
For example: If cut one 165mm drill collar, three arc slot, then the process time can be in one hour.