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Old 03-21-2013, 05:11 PM   #1 (permalink)
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Die for custom barrel threading

I have on old barrel for my ATS with worn out threads and I'd like to rethread it so that it is usable again. The problem I've hit is that it's such an obscure thread pattern that I'll have to pay to retool a CNC setup for the job, and that alone exceeds the cost of a new barrel.

Because I love DIY projects, what all is involved in building a manual threading tool for this task? I have googled around and was unable to find a .835-20 die. I realize that I'll still have to mill the OD of a virgin barrel section to be correct, but I can get that done locally without much grief.

(I acknowledge that this is likely cost prohibitive, so this is most likely just for my own education on metal working).

Any help/advice would be appreciated.
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Old 03-21-2013, 05:19 PM   #2 (permalink)
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That sounds like it is around 27/32 nominally. Which is between 7/8 and 13/16 which are both common dies. Are you sure it has to be exactly .835? It is possible it is an undersized nominal diameter of 7/8. Either way, why would you need to retool a CNC to cut that? Anyone with a manual lathe should be able to cut something with 20tpi.
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Old 03-21-2013, 05:21 PM   #3 (permalink)
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Or you can PM Gumby on here and see what the threading is supposed to be and start with that.
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Old 03-21-2013, 05:24 PM   #4 (permalink)
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Thanks Sniper42, yeah the barrel specs are exactly .835-20 (primary thread) and .760-56 for the secondary unisizer thread. The secondary thread can be worked around by "Turn[ing] the end of the barrel down to .743 for at least .135. This allows you to press the uni-sizer into place and the barrel keeps it there by pressing it against the sleeve assembly."

Is it possible (maybe reasonable is a better word) to make a manual die and cut that thread without a lathe? I've done a good deal of DIY but I have next to zero metal working experience. Always willing to take up a new hobby though

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Or you can PM Gumby on here and see what the threading is supposed to be and start with that.
The specs I have are per Gumby.
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Old 03-21-2013, 06:12 PM   #5 (permalink)
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Short answer is yes it is possible to make a die. However I, personally have had trouble making larger size dies like that and getting them to work well. More experienced machinists could probably make one.
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Old 11-02-2013, 07:26 PM   #6 (permalink)
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are the threads damaged? what do you mean by "worn out"?if theyre damaged, then just run a thread file over them.

and if they need to be re-cut, as stated earlier anyone with any lathe can cut 20 tpi threads
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Old 11-02-2013, 08:17 PM   #7 (permalink)
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Lol can you say resurection.

That being said doubt your still looking seeing as this thread is a half a year old .835 is only .01 larger than 21mm. Ever thought its metric.
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