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Re: Mulit-postioning with pnuematics this year?
Jeffraffa scheme seems to be the best under 2004 rules (Since three position solenoids are available and legal). I see no reason why they would limit this availability this year so the three position solenoids are the right to for the right job.
squirrelrocks schematic is a modifyed version of what was allowed in 2003 rules. The pressure regulator is the additional part to regulate the exhaust gas pressure. To explain it's need in this design read earlier post.
As far as how it is reacting there are a lot of variable to consider. The first two are important for all pneumatic systems. 1. Keep all your tubes short. Especially exhaust side. This will cause the device to react quicker. 2. Check for leaks.
The weight of the arm will affect the how quickly it reacts. The stopping force must compensate for both the pressure force (PressurexArea) and the weight (Massxgravity). When you are stopped the sum of the forces=0. I would imagine the if you were lifting the arm it might go slower up and stop quicker as opposed to lowering when it would go down quicker and take more time to stop.
There will be some play in the cyclinder when you stop it but if you make sure the pneumatics are correct and use the right cylinder at a good speed it should work.
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