Is this a feasible valve design?

[SlartyBartFast]

Re: Re: Major Design Problem

Originally posted by athomas


Sort of like all the major electronic guns on the market now that have a regulator for adjusting input pressure and a dwell setting for adjusting the amount of time the bolt is forward.:)

Actually, the dwell that is being talked about right now is the amount of time the valve is open to control the air to the bolt movement, not controlling the time that the bolt is actually allowed to be forward.

Initially you disagree with what I said, then you agree.

The dwel of the bolt is the time the bolt is forward AND the amount of time the valve is open.

Current electronic guns do not affect velocity if you play with the bolt dwell. At least as I understand their operation.

But the point that the dwell of the bolt would have to be in the microsecond range pretty much points to the design being unworkable.

[athomas]

Re: Re: Re: Major Design Problem

Originally posted by SlartyBartFast

The dwel of the bolt is the time the bolt is forward AND the amount of time the valve is open.

Current electronic guns do not affect velocity if you play with the bolt dwell. At least as I understand their operation.

We, at least I am, talking about valve dwell. The valve is open to let a predetermined amount of air into the area at the back of the bolt. This valve would be open for a fraction of the time it takes the bolt to move forward. The dwell of the valve will control how much air enters that area based on time. If the pressure is not dumped/vented off, the bolt will stay forward and air will continue to flow out the front of the bolt. This total bolt forward time would be considered bolt dwell on most guns.


Dwell settings on most electronic guns do affect velocity. If the bolt is held forward for a longer period of time it lets more air out the front, contributing to a higher velocity. If the dwell is reduced, the bolt is held forward for less time letting less air out the front and reducing the velocity. Most of the time people find the best dwell setting for their gun and then make all further velocity changes using the regulator.

[hunter100]

The dwell time does affect the velocity. On most modern guns, the dwell controls how long the valve is kept open. If the valve is opened and closed while the paintball is still in the barrel, you can use dwell to adjust velocity. If the valve stays open past when the ball is in the barrel, like the old matrix, you can't use it to adjust velocity, because the ball is already out the barrel. Basically the dwell on this setup is being used to control the volume of air used to fire the paintball, and in doing so controls the velocity. The velocity can also be changed by increasing the pressure on the back of the bolt, which would increase the force on it and the time the valve is open, or by increasing the gun operating pressure, which would raise the volume of air per given dwell setting and increase velocity.

[athomas]

Originally posted by hunter100
Basically the dwell on this setup is being used to control the volume of air used to fire the paintball, and in doing so controls the velocity. The velocity can also be changed by increasing the pressure on the back of the bolt, which would increase the force on it and the time the valve is open, or by increasing the gun operating pressure, which would raise the volume of air per given dwell setting and increase velocity.

Using your dwell design, you will use an excessive amount of air in cocking the gun if you keep the back of the bolt large. You should find a way to make the back of the bolt smaller to utilize a smaller volume of air as previously mentioned.

[laysomepaint]

instead of using a spring to return the bolt to the cocked position, wouldnt using the ram make everything easier to control? You would have to redesign, but it would be nicer IMO.

I see a potential problem, though. What about field stripping? Looks impossible without degassing at his point.