| 摘要 |
PROBLEM TO BE SOLVED: To provide a lathe turning method, efficiently manufacturing an eccentric nut with a very small machining error of the outer peripheral surface of a projecting part or a recessed part to a screw part. SOLUTION: According to this lathe turning method for a locking special nut, a fitting hole 14 is provided on the tip of a spindle 6 driven in rotation by a driver, a base part 16 fitted and fixed in the fitting hole 14 and a bolt part 17 are integrally provided, the base part 16 of a nut holder 15 in which the axis of the bolt part 17 has a very small eccentricity to the axis of the spindle 6 is fitted and fixed to the fitting hole 14, thereby positioning the axis of the bolt part 17 with a very small eccentricity to the axis of the spindle 6 corresponding to the amount of eccentricity of the projecting part or the recessed part of the machined nut W to the screw part, the nut W is engaged with the bolt part 17 of the nut holder 15 by the rotary drive of the spindle 6 to hold the nut W, and while the spindle 6 is driven in rotation in the holding state, one side surface of the nut W is turned by a cutting tool 13 to form a projecting part or a recessed part. COPYRIGHT: (C)2007,JPO&INPIT
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