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Unread 21-02-2012, 16:36
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VEX Robotics Engineer
AKA: Arthur Dutra IV; NERD #18
FRC #0148 (Robowranglers)
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Re: Tips from a veteran Robot Inspector

Quote:
Originally Posted by Bill_B View Post
Abrakadabra,
The pneumatic system can also get pressurized if an actuator is moved by its mechanical linkage being thwacked during a collision, for instance. Since you're going with off-board compressor, I presume that your actuators are not very big, so this isn't necessarily a problem for you. But you know rule makers. Cover the whole spectrum of possibility, if possible. I would put the relief valve into the robot's circuit even if the rules didn't require it. See [R72]
This should not happen if your pressure regulator is functioning properly. If a pneumatic cylinder is set to a working pressure of 45psi and it gets manually depressed by some impact or other impetus, the pressure regulator will vent anything over 45psi from the low pressure side out to atmosphere.

The 125psi relief valve is there in case the pressure switch fails and the compressor unknowingly keeps pumping air into the system.
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Art Dutra IV
Robotics Engineer, VEX Robotics, Inc., a subsidiary of Innovation First International (IFI)
Robowranglers Team 148 | GUS Robotics Team 228 (Alumni) | Rho Beta Epsilon (Alumni) | @arthurdutra

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