Circular Stroke Piston System

[bigalexe]

This concept is bad.

Guns work because of springs. They rely on linear motion.

Your concept is based on an engine. The only reason an engine takes a linear motion and converts it to rotary is because the output MUST be rotary. Ideally the motion would remain circular all the way through but it is ridiculously hard to come up with a good rotary propulsion system outside the water wheel (excepting Mazda). There is just too much loss of energy and also too much complexity in the design when you convert from one energy direction to another.

 

[Apocalypse-Now]

interesting concept, but i can't get it to work in my mind (i majored in design too lol).


modify, and talk to a mechanical engineer if you can.

you'll get no sound advice that'll get that functioning off of an internet gun forum.


keep thinkin on it outside the box, that's how advancements are made

 

[moonpie]

There are two key features I would like to point out.

1. Thumb Screw Pressure Adjustor for different barrel length or suppressor setup. The thumb screw simply increase or decrease the internal blow back gas pressure for the appropriate operation.

2. Composite Piston Dish pushes the bolt carrier group for shell extraction and feeds magazine bullet to the chamber. It completes one operation cycle without the need of buffer tube. This feature helps reduce weight and allows the attachment of folding stock.

3. All key Piston + push arms components are made with heat resistance light weight composite materials.

4. Hopefully the reduction of recoil would be able to achieved by the absent of buffer spring

interesting idea. try building a lightweight model and see where that leads. don't worry about what the experts say ; they'll always know everything and let you know how ignorant you are. pm me if you like .

 

[Vern Humphrey]

Would you be specific other which part of the system that failed? I really want to learn.

There are two basic problems.

First, how do you extract and eject the fired case? Your design feeds another cartridge, but doesn't clear the chamber of the previous case.

Second, how do you lock the breech?

 

[Bloodysneeze]

Lots of poor feedback in this thread. Nobody makes a successful, fully detailed design on their first try. John Browning didn't do it, Eugene Stoner didn't do it, Gaston Glock didn't do it. They likely had people telling them that their design was just wrong also. You'd also likely be surprised at where some good designs started. Nobody is going to keep trying if they just get told thier designs are "wrong" and "bad" and criticism like this would likely get you booted out of a design meeting.

That being said, this is an interesting idea but needs some refinement. You'll likely need a spring of some sort to reverse the mechanism. This could be a torsional spring in the dish, a linear spring in the piston cylinder, or something else. Also, try to reduce the number of joints. Moving the dish so the point where the rod links to the dish is in line with the piston rod would remove the need for an extra joint. You'd likely have to slot the dish also. Don't really have a lot of time to look at this any further.

I'd suggest getting a hold of some simple CAD software for practice. It will help you immensely in design and motion studies. If you're really interested in mechanical design it's also an invaluable skill for any design.

And FYI and am a practicing mechanical engineer. If you'd like some help or some modeling done I might be able to help you out.

 

[Unistat]

You know, the Army is soliciting for an assault rifle design that is capable of a "hyper-burst," that is, one(1) trigger pull that fires two(2) or more rounds with one(1) perceptible recoil impulse. That requirement is going to have to be a radical design. The only current firearm that does it is a Russian rifle that has a reciprocating barrel.

Keep thinking outside the box Zollen!

 

[Br]

Fig. 4 that 4thPointOfContact posted reminds me of the Wankel engine, a proven design at least in combustion engines. Circular stroke piston systems are certainly nothing new, but as others have pointed out, you have the extraction & feeding that needs to be just right.

http://en.wikipedia.org/wiki/Wankel_engine

At any rate, an interesting post.

 

[Zak Smith]

If the rotating mass is designed to capture energy and use that energy to chamber the next round, how does it stop when the next round is chambered? If you apply that much energy to a "lightweight composite" disc, it's going to be rotating very fast and the bolt is going to flop forward and back until the system runs out of energy.

The idea of capturing the energy during firing to use it later to reset and reload the mechanism is good - but not novel, since that's what springs do; however, this particular setup has some serious flaws.

 

[Apocalypse-Now]

well, for one thing, the reliability of a counterweight would be dependent on the angle of the rifle during firing.

 

[zollen]

well, for one thing, the reliability of a counterweight would be dependent on the angle of the rifle during firing.

You are correct. The counter weight is totally unnecessary.