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#1
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Re: Cylinder Force Calculation
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Ever see the pumpkin-chuckers, the giant air cannons that launch a 10" pumpkin about a mile away? they have huge air valves that someone pulls with a foot long handle. we dont have those valves, so you need to get the air in the cylinder first (precharge) and then pull the mechanical pin out of the way. |
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#2
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Re: Cylinder Force Calculation
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#3
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Re: Cylinder Force Calculation
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I know a cylinder with 60psi slamming it back and forth looks fast, but not compaired to something like pulling a spring back and letting it go. By precharging the cylinder, blocked half way, you are creating an air-spring. scroll back up and look at the drawing in post #9 in this thread. |
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#4
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Re: Cylinder Force Calculation
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#5
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Re: Cylinder Force Calculation
you can only use pneumatic cylinders that are on the Bimba purchase list, and none of those have internal springs
you could use an external spring, and use a cylinder to retract it. |
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#6
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Re: Cylinder Force Calculation
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#7
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Re: Cylinder Force Calculation
you are not allowed to disassemble the cylinders or modify them in any way - but you can build them into a mechanism that alters its behavior (adding an external spring-return, or an external trigger release.
No matter what the bore and stroke of the cylinder is, the air flow is controlled (restricted) by the valves and fittings and hoses. There is nothing you can do to the cylinder to make air flow through the valves faster. And you cannot use other valves, or modify the ones in the KOP. |
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#8
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Re: Cylinder Force Calculation
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#9
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Re: Cylinder Force Calculation
a smaller diameter cylinder will fill up faster, but it will have less force on its pushrod. The force a cylinder generates is equal to the surface area of its internal; piston plate times the pressure of the air you feed it with.
So, yes, a smaller diameter cylinder will pressurize faster, but the trade-off is less output force. Is there some reason why you dont want to implement the release-trigger like I drew in the diagram? its probably the easiest way to make a pneumatic shooter. |
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#10
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Re: Cylinder Force Calculation
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