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Bloomers and cock ups learning to cut thread on the lathe

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DavidA:
Not sure what is going on here.

To cut a left hand thread  (never done it ) don't you have to apply the cut while moving away from the chuck ?

Both internal and external right hand threats are made towards the chuck.

Or am I having a senior moment here ?

Dave :scratch:

unc1esteve:
You are correct.  The cross slide must also be re-positioned.

DavidA:
Mick,

What exactly do you mean by ...

..Getting home from work today I tackled the problem again and realized that by turning the male and female threads using the lathe in the same orientation and direction on both cuts I was producing one right hand thread and one left hand thread that of course simply could not screw together.

Sorry for the question,  but I can't visualize what you did.
Dave.

Bangkok Mick:
I guess cutting a left hand thread away from the chuck is the correct way but I cut both internal and external threads towards the chuck and came up with opposing threads.

I had the lead screw engaged in revers so I could arrange the cutter on the far side of the internal thread so I would be able to see it cutting the thread as it proceeded. This also caused the thread to cut an opposing thread.

DavidA:
Still don't see how this would give you a left hand thread;  unless you were running the lathe mandrel in reverse.  But I'll let it go at that.
Clearly I need stronger coffee to clear my old brain.

Cheers,

Dave. :scratch:

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