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="cohunt" data-source="post: 1821192" data-attributes="member: 94491"><p>WELLLLLL (it actually is based off the insdie of the case, not the outside)--- it is actually a very complicated equation/calculation due to manufacturing differences and specs</p><p>what we provided was the "easy" calc methods of bolt thrust--but if you read the wikipedia page I listed earlier the measurement is actually the inside diameter of the brass case, since each brass manu is different it is very hard to actually calc the true bolt thrust using these calculation methods, also the different brass alloys and state of softness/hardness will change the "case grip" to the side walls of the chamber thus actually changing the bolt thrust numbers (this is shown with NATO proof testing where they oil the proof rounds for testing to increase the bolt thrust numbers -- see the equation below for Ainternal, is actually the INSIDE area of the cartridge case head which will vary based on the "web" design</p><p></p><p></p><p><span style="font-size: 18px"><strong>Formula</strong></span></p><p><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/459bd7fdbac586e59ec0906563ac9072f7618f71" alt="{\vec {F}}_{{bolt}}=P_{{max}}\cdot A_{{internal}}." class="fr-fic fr-dii fr-draggable " style="" /></p><p>where:</p><p></p><ul> <li data-xf-list-type="ul"><em>Fbolt</em> = the amount of bolt thrust</li> <li data-xf-list-type="ul"><em>Pmax</em> = the maximum (peak) chamber <a href="https://en.wikipedia.org/wiki/Pressure" target="_blank">pressure</a> of the firearms cartridge</li> <li data-xf-list-type="ul"><em>Ainternal</em> = the inside area (of the cartridge case head) that the <a href="https://en.wikipedia.org/wiki/Propellant" target="_blank">propellant</a> <a href="https://en.wikipedia.org/wiki/Deflagration" target="_blank">deflagration</a> gas pressure acts against</li> </ul><p>[ATTACH=full]172620[/ATTACH]</p><p></p><p>hows that for a mouthful</p></blockquote><p></p>
[QUOTE="cohunt, post: 1821192, member: 94491"] WELLLLLL (it actually is based off the insdie of the case, not the outside)--- it is actually a very complicated equation/calculation due to manufacturing differences and specs what we provided was the "easy" calc methods of bolt thrust--but if you read the wikipedia page I listed earlier the measurement is actually the inside diameter of the brass case, since each brass manu is different it is very hard to actually calc the true bolt thrust using these calculation methods, also the different brass alloys and state of softness/hardness will change the "case grip" to the side walls of the chamber thus actually changing the bolt thrust numbers (this is shown with NATO proof testing where they oil the proof rounds for testing to increase the bolt thrust numbers -- see the equation below for Ainternal, is actually the INSIDE area of the cartridge case head which will vary based on the "web" design [SIZE=5][B]Formula[/B][/SIZE] [IMG alt="{\vec {F}}_{{bolt}}=P_{{max}}\cdot A_{{internal}}."]https://wikimedia.org/api/rest_v1/media/math/render/svg/459bd7fdbac586e59ec0906563ac9072f7618f71[/IMG] where: [LIST] [*][I]Fbolt[/I] = the amount of bolt thrust [*][I]Pmax[/I] = the maximum (peak) chamber [URL='https://en.wikipedia.org/wiki/Pressure']pressure[/URL] of the firearms cartridge [*][I]Ainternal[/I] = the inside area (of the cartridge case head) that the [URL='https://en.wikipedia.org/wiki/Propellant']propellant[/URL] [URL='https://en.wikipedia.org/wiki/Deflagration']deflagration[/URL] gas pressure acts against [/LIST] [ATTACH type="full" alt="1580403456512.png"]172620[/ATTACH] hows that for a mouthful [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
Top