How far should a piston atleast move backwards?
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I'd say as far as you possibly could allow the piston would be the best. Wait, never mind that, because if it moves farther then it adds space for the air to go, so I guess you wouldn't want it to go too far.
Math says that it should move atleast 1/4 of the sealing face, so for a 2" sealing face it should go back .5" for max flow. Suppose a little more wouldn't hurt.
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- Brian the brain
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Yes that's right.More will hurt performance, and so will less..
You could make it open a little more to account for the neoprene flap blocking flow a little as it bends with the airflow, as we did with Chappy..
You could make it open a little more to account for the neoprene flap blocking flow a little as it bends with the airflow, as we did with Chappy..
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
Can't ask for a better compliment!!
I'm not sure how far mine will open but I will try to compensate for it by playing with tthe piston length before sticking it together. I how ever can not take credit for the original math but I have since applied it, Gort and I were talking and that came up so yeah.
Whoever appeals to the law against his fellow man is either a fool or a coward.
Whoever cannot take care of themself without that law is both.
For a wounded man shall say to his assailant,
'If I live, I will kill you. If I die, You are forgiven.'
Such is the rule of honor.
Whoever cannot take care of themself without that law is both.
For a wounded man shall say to his assailant,
'If I live, I will kill you. If I die, You are forgiven.'
Such is the rule of honor.
Thanks for the answers. I let mine move half of the inner diameter of the barrel. That should be good.
In the MB2 I made, the piston moves back 4 cm, the barrel is 28 mm. The piston got dammaged all the time, cause it smashed against the stopper. Got a steel stopper now, the piston itself has a steel bolt in it.
So, with this new information, my fourth gun, also the first PVC gun, will be a lot bether.
In the MB2 I made, the piston moves back 4 cm, the barrel is 28 mm. The piston got dammaged all the time, cause it smashed against the stopper. Got a steel stopper now, the piston itself has a steel bolt in it.
So, with this new information, my fourth gun, also the first PVC gun, will be a lot bether.
As we've posted, to much movement can hinder the performance, go by what the math says and you will have a much better valve.
Whoever appeals to the law against his fellow man is either a fool or a coward.
Whoever cannot take care of themself without that law is both.
For a wounded man shall say to his assailant,
'If I live, I will kill you. If I die, You are forgiven.'
Such is the rule of honor.
Whoever cannot take care of themself without that law is both.
For a wounded man shall say to his assailant,
'If I live, I will kill you. If I die, You are forgiven.'
Such is the rule of honor.
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- boilingleadbath
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It might change it some... but it shouldn't hurt preformance (or saftey) noticably to allow it to move back twice as far as calculated, so you might as well let it. Anyways, it makes sure it moves back far enough to allow full flow.
And what does math tells us ?SquishY wrote:As we've posted, to much movement can hinder the performance, go by what the math says and you will have a much better valve.
I think it is logical the piston moves about 1/2 of the diameter of the barrel. If math tells otherwise, how come ? How do you calculate it ?