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Need help with M1 barrel

Posted on 07/31/2013 2:49:55 PM PDT by jstaff

I might be out of place, but I know there are some very knowledgeable folks on here, and I'm hoping someone can help with a project. I need to make a plug that screws into the reciever of an M1 carbine, to keep everything neat and clean while the barrel is off, but I don't have the design specs for the threads. I could just measure the old barrel but there's no way to tell if it was made in the high end or low end of machining tolerence. I can see it's an Acme thread and 10 tpi, but I want the precise major and minor thread diameters. Any help will be appreciated.


TOPICS: Chit/Chat; Hobbies
KEYWORDS: banglist

1 posted on 07/31/2013 2:49:55 PM PDT by jstaff
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To: jstaff

wine cork?


2 posted on 07/31/2013 2:52:08 PM PDT by American in Israel (A wise man's heart directs him to the right, but the foolish mans heart directs him toward the left.)
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To: jstaff

I gotta ask, why do you need a plug for the receiver while the barrel is off?


3 posted on 07/31/2013 2:52:39 PM PDT by Blood of Tyrants (Inside every liberal and WOD defender is a totalitarian screaming to get out.)
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To: jstaff

Are you sure you need a machined metal plug for so simple a task? Seems to me as a temporary plug for sanitation I’d find a plastic plug like for hydraulic tubing and force-fit the threads. You really don’t want to mess up the receiver threads (assuming you intend to re-barrel at some point).

TC


4 posted on 07/31/2013 2:53:37 PM PDT by Pentagon Leatherneck
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To: jstaff

Get an appropriate diameter wooden dowel.


5 posted on 07/31/2013 2:57:54 PM PDT by Joe 6-pack (Qui me amat, amat et canem meum.)
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To: jstaff

wood dowel , wine cork , wadded up paper towel... it all works ... This isn’t anything delicate after all , it’s meant to be hauled through mud , rinsed and shot after all ...

I sold my M1 Carb (a Rock-Ola) 2 years ago ... I’d just grease up any spare parts and bag them if it’s long term storage you’re looking at...


6 posted on 07/31/2013 3:17:31 PM PDT by Neidermeyer (I used to be disgusted , now I try to be amused.)
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To: jstaff

A rubber cork, even a wood plug carved from any soft wood will do.

However, Nancy Pelosi wanted you to know that she is saddened by your choice of such a violent hobby.

;-)


7 posted on 07/31/2013 3:18:02 PM PDT by GladesGuru (Islam is antithetical to, and Islam is irreconcilable with, America. Therefore - Islam Delenda Est)
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To: jstaff
I might be out of place

LOL!!! Starting a gun thread on FR is always good flame bait. /s

8 posted on 07/31/2013 3:20:12 PM PDT by Hardastarboard (Buck Off, Bronco Bama)
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To: jstaff

Can I ask a dumb question? If you are really concerned about it, why wouldn’t you just coat the threads with cosmoline and shove a wooden plug or a rag in there? Why does it have to be a threaded plug?


9 posted on 07/31/2013 3:21:30 PM PDT by dinodino
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To: jstaff
Honestly your question sounds kinda dubious.

I suggest that you contact a parts distributor and see if you can just find a spare barrel that you can adapt for your purpose of, uh, "receiver plug". Might save you some time and trouble in the machine shop.

Or you could just use a cork...

10 posted on 07/31/2013 3:24:12 PM PDT by OKSooner
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To: jstaff

You might try the M-1 carbine forum here:

http://www.surplusrifleforum.com


11 posted on 07/31/2013 3:37:38 PM PDT by dynachrome (Vertrou in God en die Mauser)
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To: jstaff

Since no one else did, I’ll bite:

From here

http://forums.thecmp.org/showthread.php?t=47494

“29° Acme variant with 10 tpi pitch and .971”-0.005” major diameter, and .913”-0.005” minor diameter. 0.052”-0.003” width at the midpoint height. Inside corner radius is 0.01” and the outside corner break is 0.005” maximum. “

(unverified)

Personally, I’d thread some Maple so you could at least lock it in w/o dealing with cork debris. In that respect the exact specs for the threads are irrelevant, as you want a loose fit, lest you deposit cellulose on the threads to interfere with the next time you thread the barrel. In line with others, I see no reason for metal.


12 posted on 07/31/2013 3:42:51 PM PDT by logi_cal869
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To: logi_cal869

Thanks everyone for all the suggestions. I don’t absolutely have to have a threaded plug, but I already own a lathe, tooling and a piece of Delrin that I have no plans for, so I thought I would make a plug. It gives me a project, protects my rifle and will look cool as he77. Win, win, win.


13 posted on 07/31/2013 3:59:49 PM PDT by jstaff
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To: logi_cal869

That data looks like it was for a garand vs a carbine friend ..... On the link ya provided.


14 posted on 07/31/2013 4:18:27 PM PDT by Squantos ( Be polite, be professional, but have a plan to kill everyone you meet ...)
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To: Hardastarboard

Really. Who wants to talk about guns on Freerepublic? I bet this thread won’t have any more than 324 million replies before the nights over.


15 posted on 07/31/2013 4:33:54 PM PDT by suthener
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To: suthener

Well, exactly. Who’s going to bump this thread by posting to it, anyway?


16 posted on 07/31/2013 4:37:28 PM PDT by Billthedrill
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To: Billthedrill

“Who’s going to bump this thread by posting to it, anyway?”

Not me, that’s for sure.


17 posted on 07/31/2013 4:42:22 PM PDT by suthener
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To: jstaff

I used to have one before the unfortunate boating....ah, never mind...


18 posted on 07/31/2013 4:54:41 PM PDT by bk1000 (A clear conscience is a sure sign of a poor memory)
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To: jstaff

Put a thread on the plug that is only a couple of turns or so, since it is not load-bearing or taking any stress. That way, the tolerance issue goes away.


19 posted on 07/31/2013 4:55:59 PM PDT by expat2
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To: expat2

You’re right, I just wanted to work on my machining skills, since I’ve never really cut Acme threads before, except just playing around. I planned to thread it far enough to push against the bolt. That way, pressure from the bolt would hold in in place, keep it from turning out. I didn’t want to introduce any foreign material (wood fiber, paper fiber, extraneous grease) so I chose the plastic rod. Way over-engineered I guess, but there’s a fridge with beer just a few feet fron the lathe, so Ima gonna gophrit.


20 posted on 07/31/2013 5:30:56 PM PDT by jstaff
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To: American in Israel

open a bottle of wine, use the cork.


21 posted on 07/31/2013 5:40:34 PM PDT by catsanddogs
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To: jstaff

Put a condom over it.


22 posted on 07/31/2013 5:50:29 PM PDT by ViLaLuz (2 Chronicles 7:14)
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To: Squantos

I tried.

I would suggest for your library:

http://www.amazon.com/Complete-Guide-M1-Garand-Carbine/dp/0917218833


23 posted on 08/01/2013 12:09:10 PM PDT by logi_cal869
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