Originally Posted by dmansr25sd
none of this will work how you think, sorry to break it to you
a noid can't flow enough air to fire a paintball/won't ever be consistent like that, anything that closes the feedneck can chop balls, trap/sliding doors also have a whole host of feeding issues
edit i completly agree with the post above me, worry about the design first then superflous parts and details
Clearly you have never seen, touched, or used an mQ valve.
The problem with the trap door is this, it forces paint that is not in the breech to move up. If it doesn't, you end up with the problem of chopping paint.
With that in mind, you could incorporate another "elevator" -- for lack of a better term -- that sits at the bottom of the breech. When the door begins to close, the elevator drops, with the ball, this will allow the trap door to not be forced to push paint up, assuming it is timed correctly, which, to be honest, would be rather difficult.
The concept that jonotwist gave is more or less brilliant. A simple design, and not very hard to improve. From my perspective, it is essentially the same shut off as is a bolt, but a little more hasslesome. With paint inconsistenices, the sizes of paintballs will vary, and smaller ones may sit too far in and will chop on the rotation. -- But then, you could apply something found in some of the new bolts out there, which is a ramp. Instead of shearing a paintball, there is a ramped edge on one part of the rotating breech to help push the ball up (like that found on an Ego bolt).
Another problem I see is space, and sealing. You could put an o-ring/gasket around the feedneck opening, so when it rotates it seals against a wall (or put the gasket in the wall), but it leaves it open to shearing. Then again, I guess if the tolerances are tight, you don't really need to seal it. -- Another would be the odd kick. Since the chamber will be spinning left, the kick (could) be rather odd and give you kick to the left and right. However, this also makes things a little easier..
Instead of having the breech revolve right, then back to center, then back to right again when firing two shots, you could reduce any kick that might come from this at high ROF's by having the breech revolve both left and right (right, then center, then left). At high ROF's, this will help reduce any perpendicular kick as the momentum can be continued when firing one shot right after another.
One of the last problems I see is if the breech rotates while firing, you might get some spin to the left or right and have balls curve.
As far as what should be used to spin the breech. If it were to spin in only two directions (center, and right), you could simply use a ram, and have the breech have a little ledge that ramps (or spirals around the breech), and then also have a spring (or air pressure) that keeps it pushed center, and when the ram is actuated, it pushes on the ramp, and because of how this sort of thing works, the ram will in turn twist the breech, when actuated again, the ram can return, and the breech will follow.
Another problem that would arise, is how eyes would work. You could cut a slit into the breech and have eyes on the body that see through the slit when the breech is centered, and it wouldn't necessarily be an area for leak when the breech is rotated, as break beam eyes are set at the bottom of the chamber, so it might not hit the feedneck opening when twisted.
As you can see, I am liking this concept of the rotating breech
. Granted, you will need two solenoids..
With a design like this, you could probably have a body between the size of a shocker and the size of a mini (thickness wise).