I simply drill a release hole in the housing where the piston shall stop.

@POLAND_SPUD I simply like the idea of "recycling" pressure. When so many people tried it and didn't succeed it's even more a challenge. And if I fail than I'm not the first. I always have more fun building things than actually using them. @jsr I will build the piston rod as light as possible. I was...

I think the main problem, when you operate at low pressure, is that the pressure escapes through the "catching holes" before the piston is able to overcome inertia and friction (thanks POLAND_SPUD for that idea). So I'm going to build a simple check valve system to prevent losing pressure. http://im...

Maybe because your diagram is a little confusing .

A little bigger and slower animation would help.

I understood it but only after watching it several times.

....or did I !?

Yea, it's more tricky than I guessed.

Otherwise there would be a lot more semi / auto on this website.

@POLAND_SPUD I saw your diagram and thought, wouldn't it be easier to build a chamber sealer and connect the piston in the green housing with the pilot chamber? The spring would release the "blow barrel" a little before the main chamber opens. @THUNDERLORD I will sure try it and if it doesn't work I...

I had the idea when I blew up a homemade silencer, so the potential is there. I think the problems are: >construction of a light piston that glides easy in the housing >the moving tee should glide easy but seal well >the return spring shouldn't be to strong or to weak >the position of the pressure c...

This is my idea of a gas operating ammo feeder. http://img404.imageshack.us/img404/9870/neu1.jpg Well it's nothing new (many weapon use it --> Ak47, BAR...) but I was asking myself if it works on a pneumatic or if someone already build something similar :evil3: (Yes, I used the search function). The...

Damn, every time I think that I have a good idea someone else did it before :evil3: .

I also had an idea about a gas operating ammo feed but a dead guy named "Browning" already did that.

Nice, you already did. 8)

I had this idea for building a mortar. Dropping the cartridge into a pipe with a nail on the ground.

But i guess your new design has more flow....

Has someone ever thought of building a cartridge with a mini coax piston? http://img523.imageshack.us/img523/9870/neu1.jpg When you place a tiny equalization hole in the piston and a light spring behind it, it's like a check valve and you can fill it from the front (red arrow). Now all you need is a...

At least you can recycle you projectiles

@markfh11q
The blades that I'm using are extra thick handcraft blades. I use them alot at work, cutting all different kind of materials. Even with pliers they are hard to snap off (they never break at the breaking point).

@jsr If I understand your post right the piston is "ONLY" actuated by the negative pressure when piloted ?

Perhaps it's just one of these "bumblebee cases". None knows how they do it, but they fly. Right now I feel like a creationist in front of a science tribunal, trying to proof something without facts. At least there was a discussion about it and that's what forums are about. And yes, I know that scie...