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CHAPTER 10 PNEUMATICS
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Figure 10 1. Typical air flow of a LEGO pnuematic system
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Available Pneumatic Parts
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LEGO has created a variety of pneumatic parts over the years. There are air tanks, air hoses, switches, tjoints, and actuators. While the color and size of these parts has varied, the way they work has stayed consistent. The availability of pneumatic parts fluctuates. LEGO Education is the best source for finding the current LEGO pneumatic parts, but a variety of third party vendors sell older LEGO pneumatic parts on the Internet. A quick search on any of the popular online classifies or auction sites will most likely return a good list of parts. Be careful to make sure that any parts you use are made by LEGO. Figure 10 2 shows many of the common LEGO pneumatic parts.
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Figure 10 2. Some common LEGO pneumatic parts
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Pumps are the primary source of air in a pneumatic circuit. There are two types of LEGO pneumatic pumps: a large manual pump that has an easy-to-activate plunger and is spring loaded and a small pump that requires a bit more effort to work manually but can be connected to a power source, such as an NXT servo, for automatic pumping. For most competitive robots, having an automatic pumping system will not be necessary, because the use of the air will be isolated to just a few missions that should be doable on just one full tank. In that case, the normal procedure would be to fill the air tank while the robot is still located in base. Figure 10 3 shows a large pneumatic pump and a small pump.
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Figure 10 3. LEGO pneumatic pumps large ( left ) and small ( right )
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Air Tank
To store air for later use, a pneumatic air storage tank is available. The LEGO air tank will store the air as we compress it using the LEGO pneumatic pump. LEGO air pressure gauges are available, but for the most the most part, you can tell when the tank is getting full based on the effort required to push the pump. The tank has a hose connection on both ends: one will be used to attach the air pump and the second opening will be the output line connected to the air switch. Figure 10 4 shows a standard LEGO pneumatic air tank.
CHAPTER 10 PNEUMATICS
Figure 10 4. LEGO pneumatic air tank
Pneumatic Switches
Like the LEGO pneumatic pumps, LEGO pneumatic switches come in two versions, but they both work the same way. They just have different enclosures that allow for multiple ways to connect them to your robot chassis. The switches have three air connections on them and a TECHNIC-type axle connected that controls the flow of the air between the air connections on the switch. Figures 10 5, 10 6, and 10 7 show the state of the air connections based on the position of the switch. When a connection is open, the air is free to flow in or out. When a connection is closed, the air cannot escape or enter the connection. When connections are opened together, the air can flow between the open connections.
CHAPTER 10 PNEUMATICS
Figure 10 5. This LEGO air switch in the down position opens the middle and lower ports.
Figure 10 6. This LEGO air switch in the middle position closes all ports.
CHAPTER 10 PNEUMATICS
Figure 10 7. This LEGO air switch in the up position opens the middle and upper ports.
Pneumatic Actuators
The pneumatic actuator is the part that actually makes use of the compressed air. The air is used to either extend or retract the actuator. There are multiple versions of the pneumatic actuators; some have only one input, and others have a top and bottom input, as shown in Figure 10 8.
Figure 10 8. LEGO pneumatic actuators
CHAPTER 10 PNEUMATICS
The single-input actuators have only one input that will extend the actuator; the cylinder has to be compressed manually either by hand or with some type of spring. The more commonly used actuator available currently is the dual-input actuator, which has inputs on the top and bottom of the actuator. The bottom input will extend the cylinder, and the top input will cause the cylinder to close.
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