Anonymous
10/8/2025, 11:52:02 PM
No.64373035
>>64372849
Resin cases when you're using the right mix of resins, don't rupture along deposition layers. Extraction is a different story, and you typically need a specially designed rim to extract without tearing the case apart. Or you use a manual action/system that doesn't actually use a rim to extract.
Revolvers are actually one of the perfect solurions, because your "rim" can be as big as needed to prevent the case from sheering at the rim, and if you have a telescoped case, in a revolver cylinder you don't have to worry about blowing off the rim of the cartridge at all. Hell, you dont technically need a rim.
Another better (in my opinion) solution is to not even have a rim on your case, as mentioned. I don't have acess to the design files, but Im messing with a forward extractor design thats basically... Take your chamber, now cut a groove into it. At the front of this grove you have a spring loaded lever that sits and pulls the case from its head. Think an external extractor on a 1911 but its actually a part of your chamber. When your bolt comes back, it actuates on that extractor lever, pulling your case out. Theres better, closer approximations but I don't have my notes.
Now mind you, this entire design depends on a telescoped case, but... Its a telescoped plastic case I'm 3D printing.
As far as propellants go, you can get good results from black powder, but what I want is near smokeless rifle performance from something safe. To that there might be addatives that if you can solve the burn rate issue with black powder, might open a lot of doors, but its still tthe biggest issue because black powder is filthy.
I want to explore electronically actuated firearms when I have the time, but thats outside the realm of my thesis research. Right now I'm committed to cartridge research.
Resin cases when you're using the right mix of resins, don't rupture along deposition layers. Extraction is a different story, and you typically need a specially designed rim to extract without tearing the case apart. Or you use a manual action/system that doesn't actually use a rim to extract.
Revolvers are actually one of the perfect solurions, because your "rim" can be as big as needed to prevent the case from sheering at the rim, and if you have a telescoped case, in a revolver cylinder you don't have to worry about blowing off the rim of the cartridge at all. Hell, you dont technically need a rim.
Another better (in my opinion) solution is to not even have a rim on your case, as mentioned. I don't have acess to the design files, but Im messing with a forward extractor design thats basically... Take your chamber, now cut a groove into it. At the front of this grove you have a spring loaded lever that sits and pulls the case from its head. Think an external extractor on a 1911 but its actually a part of your chamber. When your bolt comes back, it actuates on that extractor lever, pulling your case out. Theres better, closer approximations but I don't have my notes.
Now mind you, this entire design depends on a telescoped case, but... Its a telescoped plastic case I'm 3D printing.
As far as propellants go, you can get good results from black powder, but what I want is near smokeless rifle performance from something safe. To that there might be addatives that if you can solve the burn rate issue with black powder, might open a lot of doors, but its still tthe biggest issue because black powder is filthy.
I want to explore electronically actuated firearms when I have the time, but thats outside the realm of my thesis research. Right now I'm committed to cartridge research.