AFluffyWalrus
Plastic
- Joined
- Apr 29, 2017
Hey guys, new to the forum, so apologies if I'm breaking any rules.
I've been working on a project to see if I can't make a sort of quick-change barrel retrofit for the M14/M1A series of rifles (or any designs utilizing a screw-on barrel), and had a couple questions to ask before I finalize any design specifics.
First off, is there a way to determine the amount of forward force that is exerted on a rifle barrel when a round is fired? I know about the principles of bolt thrust and the rearward pressure on a bolt, but I haven't been able to find a way to calculate the amount of force that is trying to "push" the barrel out of the receiver. I should also specify that I'm trying to find out the figures for a barrel that does not enclose the bolt inside some sort of barrel extension (IE AR-pattern rifles), but instead for the forward pressure for rifles whose receiver takes the rearward pressure from the bolt. (IE M14/M1A, AK, most bolt actions)
Secondly, where does the chamber wall thickness rule apply? From this source, the minimum wall thickness for 308 should be .1232". However, does this only apply in front of the neck of a cartridge, or are you required to have this thickness throughout the chamber, even where the main body of the cartridge case sits?
Lastly, for more of a general metal strength question, is it feasible for a set of screw threads to not be "wrapped" either on the inside or outside of some cylinder, but to instead look more like some sort of coil? Relating back to my first question, I'm trying to figure out if some sort of receiver extension could be held onto a rifle by just having it almost snake through the receiver's threads and not having any sort of support from a central piece.
Sorry for the somewhat long-winded post. If you have any questions or need some clarification, please let me know.
Thanks in advance for the help.
I've been working on a project to see if I can't make a sort of quick-change barrel retrofit for the M14/M1A series of rifles (or any designs utilizing a screw-on barrel), and had a couple questions to ask before I finalize any design specifics.
First off, is there a way to determine the amount of forward force that is exerted on a rifle barrel when a round is fired? I know about the principles of bolt thrust and the rearward pressure on a bolt, but I haven't been able to find a way to calculate the amount of force that is trying to "push" the barrel out of the receiver. I should also specify that I'm trying to find out the figures for a barrel that does not enclose the bolt inside some sort of barrel extension (IE AR-pattern rifles), but instead for the forward pressure for rifles whose receiver takes the rearward pressure from the bolt. (IE M14/M1A, AK, most bolt actions)
Secondly, where does the chamber wall thickness rule apply? From this source, the minimum wall thickness for 308 should be .1232". However, does this only apply in front of the neck of a cartridge, or are you required to have this thickness throughout the chamber, even where the main body of the cartridge case sits?
Lastly, for more of a general metal strength question, is it feasible for a set of screw threads to not be "wrapped" either on the inside or outside of some cylinder, but to instead look more like some sort of coil? Relating back to my first question, I'm trying to figure out if some sort of receiver extension could be held onto a rifle by just having it almost snake through the receiver's threads and not having any sort of support from a central piece.
Sorry for the somewhat long-winded post. If you have any questions or need some clarification, please let me know.
Thanks in advance for the help.