Parting with internal thread

[Blackwatch42nd]

When the parting tool breaks through the brass part it may grab it and tighten it on the threaded rod pinching the parting tool.

Well, you live and learn. I tried this before reading your reply and, yep, that's what happened. Surprisingly, the tool didn't break but it did ruin the next piece inboard. Sooooo, I just parted the last few pieces without the threaded rod. Then, chucking up the all thread, threaded two of the pieces onto the rod, using one as a jam nut, the piece I was working on slightly hanging off the end, I was able to face and chamfer it. Only problem was I was unable to get the all thread turning true in the four jaw.

Here's the final result.

20170111_072222.jpg (26.72 KiB) Viewed 2511 times

Thanx for all the advise and help.
John

[tetramachine]

I assume that you single pointed the threads. If I was doing this I would knurl as you did, finish the bore, part off, then mount in soft jaws or collet, chamfer, flip, chamfer,then thread last.

[Blackwatch42nd]

I assume that you single pointed the threads. If I was doing this I would knurl as you did, finish the bore, part off, then mount in soft jaws or collet, chamfer, flip, chamfer,then thread last.

Actually, I used a tap. Figured since the nut is so thin (1/8" thickness) it would be easier to tap all at once then part.
John

[Mr Ron]

Can you part from the inside out?