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Tips & Tricks
for A Better Robot when using Pneumatics

Minimize Leaks Vibration Considerations
Regulators & Pressure Valves
Speed  
More Tips & Tricks will be added shortly. If you have any, please e-mail them to JohnGroot@aol.com

(Click on thumbnails to enlarge pictures)

Leaks: With no movement taking place the compressor should charge the tanks and then shut off. It should not restart until a valve and cylinder is operated.
Minimize Leaks (better yet, remove them completely) by careful use of teflon® tape and careful assembly of tubing and fittings. Teflon tape should start two threads back and wrap in the direction of the threads.

Minimize Excess Vibration: Use the Compressor Vibration Isolators. The Compressor is a reciprocating device and will cause sympathetic vibrations throughout your assembly unless they are used.

Regulator & Pilot Pressure: For Safety Reasons, the Norgren Regulator should be first with the Monnier unit used after that if needed.

Make sure you have adequate pilot pressure (30 psi) for the valves.

Normally regulators are used upstream of a valve but you can use a regulator downstream of a valve but it puts some extra stress on the regulator since the regulator cycles to its limits each time the valve is shifted.

Valves: All the valves in the kit are 4-way. Four are single pilot, spring return . One is double pilot . Like a latching relay. Typically Valves are use to operate an air cylinder. Air flows through the pressure port (1) of the valve then to one of the cylinder ports. Exhaust air flows through the valve then vents.
However, there are alternatives. If two valves are used, you can use them as 3-ways by blocking one port. That means it is possible to have the actuator float until one or the other valve is energized. So what you may ask? If you don't pressurize one or the other ports, the actuator is free to move as controlled by external forces. When you pressurize one or the other ports, the actuator exerts force.

If you use the valves in the normally-passing mode, the piston will possibly drift on the single ended actuator since there is an area differential. It will not move on the rotary actuator since the working piston areas are the same. See Speed below

Come back soon and we'll offer more ideas.

Speed: The speed of a pneumatic actuator depends on several things.

  • External forces.
  • Volume and pressure of compressed air available at the device
  • Exhaust flow and pressure on the opposing side of the actuator

If you are using exhaust control, you'll be using a flow control . (Allow time to see animation after you click on the thumbnail) This compound device includes a variable orifice and a check valve that permits free flow in one direction and blocks flow in the other. Consequently, air is free to flow into the actuator but the flow is restricted on exhaust.

Please note: If you don't keep the piston pressurized and then pressurize one side, the exhaust air is at ambient pressure and the flow control will not work effectively

Come back soon and we'll offer more ideas.

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Last Modified : 06/23/08 07:19 AM