Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="sedancowboy" data-source="post: 1821214" data-attributes="member: 85874"><p>If you don't agree with our math then put forth your formula to prove that our math is wrong. See the funny thing about math is that it has no emotion. The Hydraulics analogy is valid. Most hydraulic systems operate at about 2750 psi. To get more work done you increase the surface area that the Hydraulic pressure acts on via a larger cylinder. </p><p>A good example of this is if we have a backhoe with a 4" cylinder on the bucket then the bucket will not likely rip apart. But if we put a 12" cylinder on a standard bucket it would more than likely rip the bucket apart. The psi of both cylinders would be the same but the amount of force on the bucket would be much more. Force is pressure doing work. </p><p></p><p>By the way all calculations, to be accurate, should use inside dia. and every case is different and would grip the walls of the chamber differently. Also how much lube if any is on the chamber walls or outside of the case. All these factors would effect the actual bolt thrust. We are simply using known areas of different case heads as an example the numbers may vary but the concept is the same. Larger dia. cartridges exert more force on the lugs than smaller dia ones. </p><p></p><p>To answer the question of the rebated rim the formula is the same. In your example the force on the case head would increase by the same amount of difference between the case dia and the case head dia. Minis the friction of the case griping the walls of the chamber. Without doing the math over which has been put forth multiple times lets say if you have a Lupua case with a rebated rim using your example of 80,000 psi in the chamber the the bolt face would experience somewhere in the neighborhood of 100,000 psi depending on how small the case head was reduced. </p><p></p><p>Stop and think a minute. The reason we have bigger pistons in big engines and bigger hydraulic pistons on bigger equipment is to get more work done via more force. To argue with the math is to deny that a bigger cylinder can do more work than a smaller one even though the pressure is the same in each cylinder.</p></blockquote><p></p>
[QUOTE="sedancowboy, post: 1821214, member: 85874"] If you don't agree with our math then put forth your formula to prove that our math is wrong. See the funny thing about math is that it has no emotion. The Hydraulics analogy is valid. Most hydraulic systems operate at about 2750 psi. To get more work done you increase the surface area that the Hydraulic pressure acts on via a larger cylinder. A good example of this is if we have a backhoe with a 4" cylinder on the bucket then the bucket will not likely rip apart. But if we put a 12" cylinder on a standard bucket it would more than likely rip the bucket apart. The psi of both cylinders would be the same but the amount of force on the bucket would be much more. Force is pressure doing work. By the way all calculations, to be accurate, should use inside dia. and every case is different and would grip the walls of the chamber differently. Also how much lube if any is on the chamber walls or outside of the case. All these factors would effect the actual bolt thrust. We are simply using known areas of different case heads as an example the numbers may vary but the concept is the same. Larger dia. cartridges exert more force on the lugs than smaller dia ones. To answer the question of the rebated rim the formula is the same. In your example the force on the case head would increase by the same amount of difference between the case dia and the case head dia. Minis the friction of the case griping the walls of the chamber. Without doing the math over which has been put forth multiple times lets say if you have a Lupua case with a rebated rim using your example of 80,000 psi in the chamber the the bolt face would experience somewhere in the neighborhood of 100,000 psi depending on how small the case head was reduced. Stop and think a minute. The reason we have bigger pistons in big engines and bigger hydraulic pistons on bigger equipment is to get more work done via more force. To argue with the math is to deny that a bigger cylinder can do more work than a smaller one even though the pressure is the same in each cylinder. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
Top