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-   -   Cylinder Force Calculation (http://www.chiefdelphi.com/forums/showthread.php?t=42092)

Arkorobotics 20-01-2006 00:55

Re: Cylinder Force Calculation
 
Quote:

Originally Posted by KenWittlief
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.

Say if I modified the bore and stroke length? Would that make a difference? a smaller volume means it will get filled up fast right?

KenWittlief 20-01-2006 08:40

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.

Arkorobotics 20-01-2006 10:16

Re: Cylinder Force Calculation
 
Quote:

Originally Posted by KenWittlief
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.

By mod i meant like change sizes, I know you cant mess with the parts. I just want to make less volume to cover, to it fills up faster, but I guess that doesn't work.

KenWittlief 20-01-2006 10:32

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.

Arkorobotics 20-01-2006 23:43

Re: Cylinder Force Calculation
 
Quote:

Originally Posted by KenWittlief
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.

I think a lever would be a better idea. Where a bar has a pivot on one end, then have the piston in the middle then the other end of the bar hits the ball.


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