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?To nut or not to nut?

 
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  #8  
Old 09-03-2010, 10:37 AM
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Re: ?To nut or not to nut?

Quote:
Originally Posted by bigngreen View Post
I'm getting ready to build two 338's on Savage long actions, I was thinking that with the longer 30in+ heavy barrels that shouldering the barrel conventionally and not using a nut would support the barrel better but I know some of you guys are rocking monster tubes with the nut, I need some pro and cons here.
Barrel swapping is not a prime concern, consistency and accuracy are!!!
There is a post on 6 BR that addresses this question and it appears that it is up to the
Smith and the owner.

I will always use the shoulder instead of the nut unless the owner wants to use the nut.

Like Fitch said . It is one more source of problems and I have not found them to be square.

J E CUSTOM
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Last edited by J E Custom; 09-03-2010 at 09:52 PM.
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  #9  
Old 09-13-2010, 01:13 PM
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Re: ?To nut or not to nut?

engineering wise the barrel nut is the only way to go! Here's why: when you seat the barrel on the shoulder the barrel threads are actually in suspension with about 25% thread contact at best (if you can screw the barrel into the reciever you have clearence). Nobody grinds the threads, and even fewer would even know how to grind an internal thread for a near perfect fit. But with the nut you actually stretch the barrel thread and thus greatly increase the thread form contact area. What this does is that it makes the threaded portion of the barrel stay strait instead of whipping when the four vectors of force hit the threaded area of the barrel during ignition (there's actually six when you add the bolt face into the equation). There's another way to avoid this, but I won't go there as it can send you to the hospital real fast if done even slightly wrong on a big bore gun.
gary
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  #10  
Old 09-13-2010, 03:35 PM
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Re: ?To nut or not to nut?

Man, you pose a question like that and I figured youd get some hilarious responses. So far everyones being classy.
I however lost all my sophistocation and class when I read the title to your post.... HAHAHAHAHAHAAHAHA
I have no idea how to answer in a serious manner except as mentioned before ''go with your gut''. ''Nuttless'' seems to be the general consensus, make a ''Unik'' out of it hehehehehehe.................sorry I couldnt help it
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  #11  
Old 09-13-2010, 07:21 PM
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Re: ?To nut or not to nut?

Quote:
Originally Posted by Trickymissfit View Post
engineering wise the barrel nut is the only way to go! Here's why: when you seat the barrel on the shoulder the barrel threads are actually in suspension with about 25% thread contact at best (if you can screw the barrel into the reciever you have clearence). Nobody grinds the threads, and even fewer would even know how to grind an internal thread for a near perfect fit. But with the nut you actually stretch the barrel thread and thus greatly increase the thread form contact area. What this does is that it makes the threaded portion of the barrel stay strait instead of whipping when the four vectors of force hit the threaded area of the barrel during ignition (there's actually six when you add the bolt face into the equation). There's another way to avoid this, but I won't go there as it can send you to the hospital real fast if done even slightly wrong on a big bore gun.
gary

I will have to contradict the 25% thread contact because If a smith does his job right the
thread contact is almost 100% .

I have cut threads that could not be made up by hand and then simply chased the threads
without changing the compound settings and it would make up although tight and with no
slack or movement.

If the tool has the proper angle and pitch it can be fitted to any reciever nearly perfect.

The reason you stated , is the very reason dont like the barrel nut system. It is a cost
saving method and to assemble a rifle with this system all you need is an trained operator/assembler and not a gun smith.

A rifle that has a shouldered barrel has to be set up by a smith and head spaced before
assembly.

There is nothing realy wrong with the system its is just not precise enough to suit me
and I'm sure others.

So no mater what system is used 25% thread engagement is not enough.

If I do a savage with the nut I will always get 95%+ thread fit between the barrel and
the receiver before the nut is installed I will redo it.

This is not an attack just my opinion.

J E CUSTOM
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  #12  
Old 09-13-2010, 07:26 PM
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Re: ?To nut or not to nut?

I've built two myself. I kept the nut on both of them. The heavy one has a 32" #7 contour.

If you went nutless, it would be as ugly as a Remington. Sorry, couldn't resist.
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  #13  
Old 09-13-2010, 07:53 PM
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Re: ?To nut or not to nut?

Quote:
Originally Posted by geargrinder View Post
I've built two myself. I kept the nut on both of them. The heavy one has a 32" #7 contour.

If you went nutless, it would be as ugly as a Remington. Sorry, couldn't resist.
I'm kinda having remorse about even thinking about loosing the nut, if someone mistakes it for a Remington I might snap or cry, they should be able to tell by how it shoots that it is a Savage anyway
Kinda like when your kids are little and someone mistakes your little girl for a boy and you have to kindly, but firmly straighten them out before your wife hears them and opens a can on them .

I really like your gun geargrinder but I find myself struggling with having a super nice taper then step down to the nut and I just can't get it out of my mind having all that weight hanging out there.
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  #14  
Old 09-13-2010, 08:18 PM
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Re: ?To nut or not to nut?

Quote:
Originally Posted by J E Custom View Post
I will have to contradict the 25% thread contact because If a smith does his job right the
thread contact is almost 100% .

I have cut threads that could not be made up by hand and then simply chased the threads
without changing the compound settings and it would make up although tight and with no
slack or movement.

If the tool has the proper angle and pitch it can be fitted to any reciever nearly perfect.

The reason you stated , is the very reason dont like the barrel nut system. It is a cost
saving method and to assemble a rifle with this system all you need is an trained operator/assembler and not a gun smith.

A rifle that has a shouldered barrel has to be set up by a smith and head spaced before
assembly.

There is nothing realy wrong with the system its is just not precise enough to suit me
and I'm sure others.

So no mater what system is used 25% thread engagement is not enough.

If I do a savage with the nut I will always get 95%+ thread fit between the barrel and
the receiver before the nut is installed I will redo it.

This is not an attack just my opinion.

J E CUSTOM
first of all when deal with threads that are larger than an inch in diameter the best you can ever hope for is roughly a 60% thread. Some folks do say they can get 65%, but I've never seen anything close to that. (read the Machinest Handbook, or better yet order a copy of thread form statistics from the Bereau of Standards from the Government. This 60% is a Class 1 ground thread. You cannot get the proper helix angle turning a thread in a lathe. A thread that's around 1/2" is best at around 70% to 75%, but the actual contact of the thread form (male to female) will be less. It just a fact of life.

Secondly, should you manage to get that 95% thread contact; all I can say is good luck putting it together. And if by chance you do get it together; then good luck ever getting it apart

do this: Cut a 1.05 thread to match the Savage nut. Now take a magic marker and coat the threads on the male part. Screw it together, and then take it off by screw the nut all the way accross the turned thread. Look at it under a strong light and a magnifying glass. Better yet, if you have access to a shadowgraph. Then cut a section of the nut, and clamp it to the thread form. Results make you wonder how the threads even went together.

not being critical, but I made a living doing this for almost 40 years, and it's just the nature of the beast.
gary
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