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I think that causes the chuck on an ML-7 (which i use) to unscrew itself
You can cheat the sprocket thread by cutting it in the first op, using the pre-cut OD of the lock ring thread as your relief so you can have the sprocket thread tight to the shoulder without worrying about either reversing the spindle or having to control the stop very precisely. The lock ring thread looks after itself when you turn the part around for the second op as it's left handed 🙂
The pictures are in the wrong order, on reflection I'd do the ID thread first as it's furthest from the chuck so you want all the stock in place to maximise rigidity.
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gbj_tester
i'm not very experienced, but I think that causes the chuck on an ML-7 (which i use) to unscrew itself