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Rifles, Reloading, Optics, Equipment
Gunsmithing
?To nut or not to nut?
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<blockquote data-quote="Trickymissfit" data-source="post: 424230" data-attributes="member: 25383"><p>first of all it's a 1.050-20 thread; not a 1.00-20 thread if it matters much. Now here's a test; take a piece of 4150 steel or 4350 steel that is pretreated. Turn the threads on the shaft, and make a nut with the same amount of threads the nut would have. Find a 100 ton arbor press and press them apart. Now take a piece of steel just like the other and turn a nut with .75" of thread and try to press the shaft out of the nut. Guess what? You'll run for your life before it lets go, and the 16 pitch will let go first everytime if your brave enough. The thread in the reciever takes the pressure, not the nut everytime. The only thing the nut does is to act as a jam nut. Draw the thread form up in CAD, and make a measurment accross the pitch diameter, and multiply that times how many threads are in the reciever on both threads. A fine thread is always stronger (you can find that out in that thread standards book). Now you find out what the shear strength is for the type of steel your using and do a little math (you might be just a little scared when you look at 416 stainless steel by the way). But to compound this, if the thread form flexes inside the female thread it is weaker. Once again it's the nature of the beast. There are a couple ways to beat this problem in either setup, but it done wrong they'll be a complete disaster. Yet the best setup is no threads period, and that's easy to do.</p><p> </p><p> The cantaliver effect has been an argument for about 100 years now, yet nobody has ever proved out out without the slightest doubt. Heres why; 3/4" of threads is not enough to support a 22" long medium weight barrel; let along a cylinder (1.25" strait tube). The shoulder becomes a fulcrum actually aiding induced flex by leverage. This has been proven out more than once by the simple addition of a shoulder pilot in the reciever. The problem here is that most all actions have too short a bridge to make this work well (needs to be at least 1.00" long). This is one of the reasons the older 40X Remington works so well when compaired to the 700. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 424230, member: 25383"] first of all it's a 1.050-20 thread; not a 1.00-20 thread if it matters much. Now here's a test; take a piece of 4150 steel or 4350 steel that is pretreated. Turn the threads on the shaft, and make a nut with the same amount of threads the nut would have. Find a 100 ton arbor press and press them apart. Now take a piece of steel just like the other and turn a nut with .75" of thread and try to press the shaft out of the nut. Guess what? You'll run for your life before it lets go, and the 16 pitch will let go first everytime if your brave enough. The thread in the reciever takes the pressure, not the nut everytime. The only thing the nut does is to act as a jam nut. Draw the thread form up in CAD, and make a measurment accross the pitch diameter, and multiply that times how many threads are in the reciever on both threads. A fine thread is always stronger (you can find that out in that thread standards book). Now you find out what the shear strength is for the type of steel your using and do a little math (you might be just a little scared when you look at 416 stainless steel by the way). But to compound this, if the thread form flexes inside the female thread it is weaker. Once again it's the nature of the beast. There are a couple ways to beat this problem in either setup, but it done wrong they'll be a complete disaster. Yet the best setup is no threads period, and that's easy to do. The cantaliver effect has been an argument for about 100 years now, yet nobody has ever proved out out without the slightest doubt. Heres why; 3/4" of threads is not enough to support a 22" long medium weight barrel; let along a cylinder (1.25" strait tube). The shoulder becomes a fulcrum actually aiding induced flex by leverage. This has been proven out more than once by the simple addition of a shoulder pilot in the reciever. The problem here is that most all actions have too short a bridge to make this work well (needs to be at least 1.00" long). This is one of the reasons the older 40X Remington works so well when compaired to the 700. gary [/QUOTE]
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Gunsmithing
?To nut or not to nut?
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