It's an idea for a repeating firearm that doesn’t use metallic cartridges. 2
Posted by FinancialSet1981@reddit | GunnitRust | View on Reddit | 28 comments
The 6th, 7th, and 8th GIFs show the mechanism of the original Kalthoff repeater that I used as a reference.
Compared to the post I uploaded last time, it seems that the chainfire issue has been resolved.
afriendinsneed@reddit
hear me out
black powder/smokeless powder impregnated filament to print the sacrificial casing from
Gul_Hafizullah@reddit
Top shelf dysgraphia.
ColumbusJewBlackets@reddit
As someone with dysgraphia I recognized the handwriting immediately
FinancialSet1981@reddit (OP)
I’ve been on my devices typing so much lately that my handwriting has gotten worse.
Dick__Marathon@reddit
Hey I could pretty much read all of it. That more than I can say for my own handwriting lol
GunnitRust@reddit
I have a primer where my handwritten letters are next to printed ones so my kids have a chance with my logbooks and projects when I get called home.
ThePenultimateNinja@reddit
Rotating shart connection
bill-pilgrim@reddit
This is an exciting idea. So you’d have a spring-loaded tube magazine for lead and a similar tube magazine for packaged powder charges/cartridges? You’ll need a fairly sturdy cartridge with uniform size and mass in order to feed consistently, so I think your biggest challenges would finding a cartridge material appropriate for the application and then setting spring lengths and tensions on each magazine to consistently feed the slug and cartridge each time.
Greenshardware@reddit
What if a bit of debris creates an ember that is carried over to the fill step?
FinancialSet1981@reddit (OP)
Wouldn't that cause a cook-off?
BoredCop@reddit
That's why the original Kalthoff repeater has such a long distance between the powder reservoir in the stock and the fill port forward of the lock. With the operating lever only carrying a small amount of powder, in a thin sheetmetal thingy which can burst at low pressure well forward of the shooter's face if it does cook off. That's actually a quite thoroughly planned design with a safe failure mode in case of any lingering embers. Also they way the Kalthoff uses gravity feed forces the user to hold it muzzle up while cycling the action, and any ember therefore cannot fall upwards against gravity into the carrier part to transfer back to the whole powder reservoir. Stuff only ever moves one way through the system, with that lever mounted powder carrier providing a safe "air gapped" system as well as a sort of mechanical fuse which can vent relatively safely.
Funny by the way, I saw the first picture and went "Did he just reinvent the Kalthoff?" Then swiped to the next picture and saw you actually used the Kalthoff for inspiration.
Anyway, you would be wise to analyse and consider any ways that ignition could travel the wrong way and ensure your magazine is both properly separated from the chamber area and also ensure it can vent pressure in a safe direction if it does chain fire.
Main problem I can see is a lack of obturator and little consideration for fouling going back into the mechanism to jam things up. This was also a bi problem with the original Kalthoffs.
Greenshardware@reddit
Yeah, the whole powder reservoir. Could be catastrophic.
Constant-Draw2629@reddit
Almost like a blackpowder version of the alofs mechanism it seems just automatic instead of manual. Very cool.
Alternatively to the linen you could use cardboard tubes sort of like the Pritchett cartridge. Also if you intended to have a method for loading powder evenly each time in the gun itself you could use a powder measure as rhe basis for that, but it seems like you more intend to make cartridges ahead of time and then load them into the tube. You could also make some aspect easier by using an electric spark gap igniter.
Constant-Draw2629@reddit
The spark gap igniter would eliminate mechanical complexity which makes the inevitable fouling less of an issue
FinancialSet1981@reddit (OP)
An electric ignition system sounds like a good idea too.
BoredCop@reddit
The problem is black powder fouling is electrically conductive, it's carbon after all. So your "spark plug" shorts out rather quickly, unless perhaps if you have a really beefy ignition coil to make a spark anyhow.
jagdterrier82@reddit
You have black powder pellets. The main challenge would most likely be the usual for the black powder systems - fouling makes it cease function fast, and you need very good sealing to not cause a risk of igniting the other loads, or in your case the powder storage.
I would think that a good start could be looking at the sharps carbine and other chamber loaders, if you could alternate the chambers sideways and keep a tube with pellets and bullets prepared.
See Alofs shotgun as one possible inspiration.
Or a revolving setup lending the nagants gas sealing setup, but that is even messier.
Anyway, fun idea, likely mortally dangerous in practice. The same way the nunchaku is fascinating in being as dangerous for the user as the target 😏
Single_Version_9071@reddit
Source: Wikipedia https://share.google/rlZkKIe6owCwIKk1G
Like this?
TrolleyDilemma@reddit
Someone get this MKUltra victim a CNC machine
Blackopsman_21@reddit
This is basically how the G11 rifle works ngl
Myelo_Screed@reddit
Yo I thought a kid made this until the 6th slide
Giterdunn1@reddit
You'll have problems sealing the bolt to the chamber, just like every other caseless design ever tried. Most people don't realize the case is there as a seal, not just to keep the powder together with the bullet as they had paper/linen cartridges for that. They only work in muzzleloaders, so when breechloading guns were invented they discovered this problem and then developed brass cartridges to solve it
FinancialSet1981@reddit (OP)
I've also considered a design similar to the Chassepot rifle that uses rubber at the breech to gas‑seal the chamber.
Floop_The_Pig@reddit
I think this is a fantastic design. The biggest issue with this though is the lack of repeatability in a powdered propellant. When you lever a new round and powder, the powder won't be the same amount every time. It kind of reminds me of the black powder engine. I'm not very familiar with muzzle loaders but I think there are pressed powder charges that are pre-measured. Combining the mechanism to load bullets and black powder "charges" would be perfect.
FinancialSet1981@reddit (OP)
This is not a powder-and-bullet loading, but a cartridge loading. You can see it in the fourth picture.
FinancialSet1981@reddit (OP)
That's the fifth photo, not the fourth.
stanky_one@reddit
Neat idea. I always wanted to design a pump action type that used the rubber smith carbine cartridges, because I feel like you could 3d print them easily with a rim for an extractor
Lucky7Actual@reddit
This is cool as fuck