air bearing rotary table quotation
With proper selection and integration of high-performance brushless DC servo motors ABTech’s air bearing rotary tables provide ultra-smooth and precise rotary motion. With high torque, high performance motor drives, our motion experts will gather your specific requirements and work closely with our motor suppliers to create/select a motor drive that suits your specific application. Whether you need sub-micron position accuracy with minimal settle time and stringent following error specifications, high-speed constant motion, or a combination of both there is an ABTech rotary table that will meet your needs.
ABTech’s modular design approach facilitates multiple system configurations to optimize the price-for-performance required in your application. This approach allows the user to define the level of control desired for the most cost-effective solution. Our complete engineering services allow us to respond quickly to provide a solution to your O.E.M. requirements for ultra-precision rotary motion.
ABTech’s standard line of high precision, air-bearing rotary tables (AT Series) and heavy-duty rotary tables (HDRT Series) are ideal for low-speed TIR measurements, optical inspection, precision assembly, or light machining and grinding where radial and axial accuracies down to 2.0 µ” are required. These are available with tilt and center worktables, precision fixtures, 3-jaw chucks, vacuum feed through the center, and motor drives. They are manufactured with 440CSS and hardened to 58 – 60 RC, making these rotary tables the most robust available.
Rotation tables with air bearings are used when rotary motion with the highest accuracy, smoothness, and geometric performance is required. Due to the lack of friction, these high precision rotation bearings and direct-drive motorized rotary tables can achieve angular resolution in the sub-microradian range. PI’s air bearing design and manufacturing group provides hundreds of man years of design experience along with the manufacturing and test equipment to produce high quality rotary tables with the tightest tolerances.
Rotary air bearings (air bearing spindles) are friction free, and all of PI’s motorized air bearing rotation stages employ closed-loop, non-contact 3-phase direct-drive torque motors, and optical high-resolution rotary encoders for ultra-reliable maintenance-free operation with basically unlimited service life.
Absolute angle-measuring feedback sensors are available to provide closed-loop control with single digit microradian bi-directional repeatability. Direct-drive rotary air bearing tables also provide better eccentricity, flatness, and minimized wobble compared to rotary stages based on mechanical bearings. The friction-free design allows for high angular velocity without vibrations and noise.
Applications of rotary air bearing spindles / motorized direct-drive rotary tables include indexing, metrology, optical lens testing, bio-medical engineering, runout measurements of machined parts, and fiber optics.
PI’s high-performance closed loop servo motor controllers are available to precisely control position, acceleration and velocity, with advanced algorithms. Fully integrated multi-axis motion systems with linear air bearing stages and combinations with gantry systems are also available from PI’s air bearing division.
Air Bearing Rotary Tables, Table Top and Work Load are Supported on Air Bearings whose Freedom from Friction Contributes to Extremely High Positional Accuracy
An Interlocking Switch is used when Motors are Incorporated to Prevent the Table Top from Moving when the Air Supply is Turned Off. When the Air Supply is Turned Off, the Table Top Sits Firmly on our Cast Base with an Extremely High Accuracy of Parallelism Between the Base and Table Top
Rotary tables specifically developed for use in Metrology applications. CMM tables, inspection tables, assembly tables. Range of sizes 100mm thru 5,000mm. Larger on request.
Air bearing rotary tables, when rotating, the table top and work load are supported on air bearings whose freedom from friction contributes to the extremely high positional accuracy. High precision needle roller bearing maintains radial accuracy.
Supplied with each table. On/off Switch controls the compressed air supply to the table. Interlocking ensures that the motor drive can only operate if the air supply is on. When air supply is off, table sits firmly on the base casting with extremely high accuracy of parallelism between the top surface and the underside of the base.
These systems designed to replace conventional compounded XY tables, where one axis is being carried by another. As a result, Planar XY Table offers greater reliability and performance realized through design simplification and elimination of wear-prone components.
Planar XY Table consists of moving element called forcer which glides on the frictionless air bearings over the special "waffle-like "surface called platen.
The design of the ABRS series direct-drive rotary stage has been optimized to minimize stage height. The low profile of the stage reduces the effective working height of the system, minimizing "stack-up" related errors. In addition to the low overall height, the ABRS series provides a clear aperture that can be used for product feed-through, laser beam delivery, cable clearance or application-specific requirements.
The ABRS design features large air-bearing surfaces for high stiffness and load capacity, producing not only excellent axial and radial error motions but outstanding tilt error motion, as well. The resultant face error motion is significantly better than other rotary air-bearing tables and spindles, greatly benefiting applications requiring exceptional planar performance.
The A. G. Davis Air Bearing Rotary Table consists of hardened and stabilized stainless steels and/or high grade steels with corrosion resistant coatings. The base is made from high grade meehanite castings. The Rotary Table employs a fully trapped gas bearing for both radial and thrust planes. The gas bearing jets are manufactured of precision machined gem stones. The air bearing along with the closed loop servo system provides for continuous as well as point to point measuring. Standard faceplate piece part hold down consists of threaded hole patterns, or special configurations are optionally available.
The PIglide RT series of nonmotorized passive rotary air bearings are designed for accuracy, precision, high stiffness, and ease of use. They can be used in any orientation and are easy to integrate with motors and encoders for complete positioning solutions.
The bearings of the RT series offer superior eccentricity, flatness, and wobble performance. Because they are completely friction-free, they exhibit no breakaway torque and no frictional resistance during operation. They are ideal for use in cleanrooms, require no maintenance or lubrication, and have unlimited lifetime.
Air bearing stages are used where vibration-free motion is required, velocity needs to be highly constant, and optimum angular repeatability is requested.
Air bearings avoid friction, wear, and backlash effects. PIglide linear, rotary and spherical bearings are precision components that can be integrated and motorized for applications in OEM, industrial, and research markets.
New Way Air Spindles are an exceptionally low flow technology, taking almost six hours to push one cubic meter of air through a 50mm x 100mm bearing, and thus, are extremely efficient in operation when compared toorifice-based systems. If airflow is somehow disrupted to the air bearing, the porous nature of the bearing surface means depressurization will occur slowly, allowing for a soft landing, ensuring the spindle and the guide surface remain undamaged. Contrast this with orifice and magnetic bearings which can often fail incatastrophic ways, and we see how air spindles provide all the benefits with none of the drawbacks.
MicroCentric LDN Air Cylinders feature a high performance sealed design air bearing assembly. The air bearing incorporates a hardened steel journal and a housing supported by high speed sealed bearings. This advanced design combined with MicroCentric"s precision manufacturing capability produces air cylinders of unmatched performance and reliability.
Air cylinders enable fine adjustment of draw tube force (clamping force) to prevent distortion of workpieces during clamping compared to hydraulic actuators. MicroCentric LDN Cylinders are maintenance free, requiring only filtered air to be provided continuously to the air bearing assembly during rotation.
LDN Air Cylinders can be adapted to all machine spindle and rotary table configurations to actuate jaw, collet, and diaphragm chucks. MicroCentric can supply spindle mounting plates and draw tubes as required, as well as a variety of precision workholding products.
These high performance rotary air bearings are designed for accuracy, precision and ease of use. These air bearing rotation tables can be used in any orientation and are easy in integrate with motors and encoders for complete positioning solutions. We use them with simple o-ring belt drives for ultra-precision grinding and inspection in house. Please download a datasheet for more information.
The ultra-precise face grinding is a widely-used processing method in mechanical industry. Fig. 1 shows the schematic view of the face grinding process, the workpiece is held by the porous ceramic vacuum chuck and driven by the rotary table spindle; the diamond cup grinding wheel is driven by the inverted motorized spindle. During grinding process, the grinding wheel and the workpiece rotate around their rotational axes simultaneously [1-3]. Compared with the wheel motorized spindle, the rotary table spindle has a strict technical requirement including a larger axial load capacity and a more complex configuration.
The rotary table spindle usually consists of a rotor supported by bearing, a motor, a workpiece chuck, a coolant system, an electronic control and measurement system, etc. According to type of bearing, the rotary table spindle can be classified into three categories: the spindle with rolling bearing, the spindle with fluid bearing and the spindle with air bearing. The rolling bearing spindle [4-6] is simple in structure, easy for maintenance, but low in rotation accuracy, limited in working life and moderate in loading capacity. Compared with the rolling bearing spindle, the fluid spindle [7, 8] has higher loading capacity, higher rotation accuracy and longer working life, but more complicated construction and higher manufacture cost. Among three rotary tables, the air bearing spindle [9-11] is highest in the rotation accuracy, lowest in friction loss, lowest in heat generation and longest in working life. Despite of being less favorable in loading capacity, the air bearing spindle can also be used to carry a large load by increasing the diameter and decreasing the clearance of the bearing. Based on the assessment of three types of bearing, the air bearing is preferred to meet the requirement of the ultra-precise face grinding.
This study develops the rotary table spindle with externally pressurized air bearings for the ultra-precise face grinding process. To increase the axial loading capacity, a thrust plate with a large effective area is employed to support the rotor, while, a short radial bearing is used as the radial locating of the spindle’s rotor. A vacuum clamp system is developed to locate and clamp the work piece. The static Reynolds equations and the finite element method are used to analyze the static performances of the rotary table spindle. The perturbation equations and the equations of motion for the rotor-bearing system considering 5 degrees of freedom (DOF) are employed to analyze the dynamic performance of the spindle. Finally, an experiment study is conducted to verify the theoretical model for the rotary table spindle.
Physik Instrumente has announced a new large motorized rotary air bearing adding to its existing families of PIglide air bearing rotary stages. The A-688 model offers superior positioning and geometric performance, absolute high-resolution encoders, and a large, ⌀260mm clear aperture making the air bearing stage a precision instrument for optical alignment, metrology, inspection, calibration, and scanning.
Air-bearings have no rolling or sliding elements and deliver frictionless, non-contact motion, resulting in negligible reversal error, better flatness, and minimal wobble and eccentricity. All these are ideal prerequisites for applications such as inspection and metrology, calibration, and scanning of high-end parts such as infrared and precision optics, turbine blades, shafts and bearings in aerospace, aircraft, automotive, semiconductors, and photonics industries.
Air bearings replace mechanical contact by a thin film of air which is completely frictionless, resulting in no breakaway stiction or drag friction during operation. Featuring high performance, low-cogging frameless slotless torque motors and optical encoders, these stages can be used in any orientation.
The A-688 is customizable with options to create a solution for point-to-point indexing or constant velocity scanning. Coupled with no required maintenance or lubrication, these rotary positioners have a virtually unlimited life.
ZEISS #HandsOnMetrology has introduced its new ZEISS T-SCAN hawk 2, developed and produced in Germany and certified for the highest industry standards. ZEISS T-SCAN hawk 2 is a portable, reliable
Creaform has announced the addition of the high-accuracy handheld scanner HandySCAN BLACK|Elite Limited to its HandySCAN 3D | BLACK series lineup, an ongoing reference in portable metrology. Developed over the
ZEISS #HandsOnMetrology has introduced its new ZEISS T-SCAN hawk 2, developed and produced in Germany and certified for the highest industry standards. ZEISS T-SCAN hawk 2 is a portable, reliable
The PIglide RT series of nonmotorized passive rotary air bearings are designed for accuracy, precision, high stiffness, and ease of use. They can be used in any orientation and are easy to integrate with motors and encoders for complete positioning solutions.
The bearings of the RT series offer superior eccentricity, flatness, and wobble performance. Because they are completely friction-free, they exhibit no breakaway torque and no frictional resistance during operation. They are ideal for use in cleanrooms, require no maintenance or lubrication, and have unlimited lifetime.
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