Need to Thread

[dfariswheel]

You'll probably have to turn it down a little.

Threading dies open up by screwing a screw on the side IN. This forces the die to spread.
You can then start threads with a shallow cut to more easily form the threads, then close the die and complete the threads to full depth.

You might get the die started on the barrel but I don't think it'd work out with that much difference in size.

[IPSC]

I thought that might be the case.... this will be a problem for me as I'd like to do the barrel threading myself, manually, with a TAT.

The barrel has not yet been threaded, and the fellow making the muzzle brake for me, can do other thread sizes, he simply suggested 5/8-24.

For the same barrel, what if we went 11/16 - 24 instead ??? ... Would that help enough for me to do it this way?

[dfariswheel]

That's going to depend on what threads he can do and whether you can find a die that size.

I'd suggest you talk to the guy making the muzzle attachment. If he's up to custom making it, he should be able to give you better advice on what you can use on your barrel size.

[IPSC]

I was hoping for more of a generic answer....like.... how much "meat" can be handled (radially), by a cutting die. In other words, it's not so much a question of thread size to use, it's more a question of the radial distance "difference" between the starting diameter of the "work" you will be threading, and the thread size you will use. And what a threading die "usually" can get away with.

With that said, a 5/8"-24 thread starting with a .815 barrel results in a radial "cut" of about 0.100"...apparently too much.

Going up to a 11/16"-24 doesn't help too much either.....

Going up further to (say) 13/16"-24,...results in a "cut" amount that mimics what a lot of my AK-47 friends do, to thread a 14 x 1 mm thread onto a .570" ( or so) barrel with no issue...it seems a cut size along these lines works.

So, was hoping to hear some suggestions from a machinist's point of view of how much cut depth is acceptable for thread dies.

[dfariswheel]

I'm not a machinist since most machine work was handled by someone else.

Other than general knowledge and doing revolver barrel work, I didn't spend a lot of time at a full size lathe.
For this, you'll need to talk to a real machinist.

[IPSC]

Fair enough....thanks all !!!

[guncrank1]

Sorry late thread
And it is year old but if you are threading for anything except a suppressor, a die and guide it ok
A can requires a metal lathe.

[retDAC]

Thanks Claude.