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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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