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736 Application and Principles of Aerostatic Bearings
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Aerostatic bearings have found popular use in grinding, machining and micropositioning applications where a full performance at zero speed and the absence of friction is essential Gas bearings have found applications in machine tools, measuring and inspection instruments, process and manufacturing equipments, test equipments and medical equipments The most widely used air bearing applications in machine tools are those involving rotating machinery spindles, especially grinding wheelhead and workhead spindles Gas bearings are well suited for many instruments because of light loads, for example, in optical measurements In the field of process machinery, expansion turbines utilize gas bearings because of their good cooling properties Transmission dynamometers use air trunnion bearings with a negligible static friction for achieving high accuracies for torque measurement Other test and experimental equipments include dynamic rope testing machines where four semi-cylindrical air bearings are employed For medical applications,
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the high-speed dental drill represents one of the earliest applications for air bearings An air bearing is able to provide for high-speed operations and a low noise level while operating at a fraction of the power needed previously when precision ball bearings are used These dental drills are often subjected to touch down and overload A careful designing allows the bearings to operate without any significant damage (Figure 716) Another example in the medical field is the ballistocardiograph, which is used to detect and measure the heartbeat of a baby before birth [14] Air bearings are also used in a variety of applications including Coordinate Measuring Machines, Precision Machine Tools, Semiconductor Wafer Processing, Medical Machines, Optical Lens Production Equipment, Digital Printers, Lithography, Precision Gauging, Diamond Turning Machines, Materials Testing Machines, Crystal Pulling, Rotary Tables, Spindles and Friction Testing Machines The air bearing is well suited for application in certain manufacturing environments such as in extremely high or low temperature and radiation environments This is mainly due to the desirable properties of air Aerostatic bearings are used in slideways for manufacturing precision machine tools, measuring machines, test equipment, bearings for linear motors and high-speed precision spindles for turning, milling or grinding (Figure 717 and Figure 718) Figure 719 shows a five axes air bearing Roughly 13 inches in diameter, this bearing can support 3,500 pounds (1,500 kg) while providing rotation around all axes and linear motion along
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Fig 716: An air driven dental drilling head incorporating air
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bearings [14]
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Fig 717: A linear motor with air bearings
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[4]
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Fig 718: A planar and cylindrical bearing [4]
two axes These bearings are installed as part of the seismic isolation system in the Laser Interferometer Gravitational Wave Observatory or LIGO in both Hanford, WA, and in Livingston, LA When all of the bearings are used in concert, the 2 mile long interferometric path can be precisely adjusted Figure 720 shows the use of aerostatic bearings to mount a 915 cm aperture telescope capable of operating within an aircraft at an altitude of 14,000 m The total mass supported by the bearing is 1,950 kg The bearing system consists of a spherical rotor of a 04 m diameter, which is held by two ring segments The stiffness varies from 1 kN/m axial to 24 kN/m radial under loads of 34 kN and 19 kN, respectively A gyroscope is any rotating body that exhibits two fundamental properties: The first is the gyroscopic inertia or rigidity in space, Fig 719: A series spherical air bearing with hardware and pedestal [7] whereas the second is precession which is the tilting of the axis at right angles to any force tending to alter the plane of rotation Johann Bohnenberger first discovered the gyroscope in 1817, and the term gyroscope was first used in 1852 The super precision gyroscope shown in Figure 721 comes with an electric motor to help achieve speeds up to 12,000 rpm with high grade gas bearings Gas bearings are well suited because they have low friction characteristics Gyroscopes are used in science demonstrations, computer pointing devices, racing cars, motorbikes, spinning tops, gyrocompasses, virtual reality, anti-roll devices or stabilizers, monorail trains, ship stabilizers, artificial horizons or autopilot, segway scooters, robotics and Levitron [16]
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