When we cut three kinds of locking round nuts of M76×2, M90×2 and M95×2 on the spindle of C6150 lathe, the original internal thread of the finished car was processed by 45° welding turning tool and internal thread turning tool. After the processing step is to fix the position, the inner hole of the 45° turning tool and the inner and outer holes are coarsely chamfered and the finished end face. Then turn the tool holder, change the internal thread turning tool, and semi-finish the internal thread of the car, leaving the last remaining amount. Then turn the knife holder, change the 45 ° turning knife to pour the inner and outer holes 2 × 45 °, clear burrs. Finally, the tool holder is changed, the internal thread turning tool is changed, and the fine thread is required.
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