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MOMENT WEIGHT SCALES 
Model MW900 Moment Weighing Scale
PRODUCT OVERVIEW From repairing turbines to manufacturing wide chord fans blades, Space Electronics’ MW series of moment weight scales can dramatically reduce your costs through smaller batch sizes and shorter cycle times because of their world class measurement accuracy and repeatability. Moment weighing scales measure the moment weight of a blade (see definition of moment weight). These measurements facilitate blade matching to improve turbine or fan balancing and reduce vibrations. Measuring the moment weight of blades is the first stage of balancing a turbine prior to stacking the rotor. TYPICAL APPLICATIONS Space Electronics’ moment weight scales are applicable to both OEM manufacturers and
maintenance and repair operations (MRO) providers in a variety of industries and applications
including: HIGHLIGHTED BENEFITS Our moment weighing scales use a unique design that provides key advantages: • Accuracy - Higher accuracy moment weight measurements yield individual rotors with small residual imbalances, dramatically reducing the time required for balancing of stacked rotors during final assembly. Space Electronics instruments use crossed-web flexure pivots and force restoration technology, resulting in instruments which are at least 10 times more accurate than traditional methods using strain gauges and knife edges. • Range - Higher accuracy means that the same scale can be used for a wider range of blades. Traditional moment weighing scales designs introduce a large percentage error when measuring small blades. The higher accuracy of Space Electronics moment weight scale reduces the error by a factor of at least 10, which enables the measurement of much smaller blades with the same instrument that is used to measure larger blades. • Repeatability - When used with Space Electronics blade adapters, the MW series of moment weight scales ensures that multiple operators will get the same measurement for the same part. This repeatability eliminates the need to run large batches with a single operator, enabling your facility to employ Lean manufacturing techniques by reducing batch sizes and operator cross-training. • Durability - Knife edge technology dulls over time due to standard wear and tear. This is a known problem in the moment weight machines from other manufacturers, whereas Space Electronics employs crossed-web flexure pivots that are not susceptible to damage and wear over time. This results in machines that are more robust and likely to survive under the daily wear and tear of a factory environment. • Temperature Compensation - Some moment weight scales cannot be used on certain days or certain times of day because of the temperature variations in the factory. Our scales use the only temperature-compensated transducers in the industry. This eliminates errors due to temperature changes in an open factory environment. • Radius Compensation - Most moment weight scales require that the blade be fixtured at the exact same radius as the blade has in the engine. By providing the on line computer with blade pan weight information, our scale can correct for deviations from proper blade fixturing radius. This is most useful when measuring blades whose in-engine radius is smaller than the interface radius of the moment weight scale. Space Electronics can provide and integrate a force restoration pan weight scale into the system for automatic pan weight data acquisition. All benefits of our single axis moment weight scales... WHY MEASURE MOMENT WEIGHT? Balance is a major factor in determining the reliability and service life of turbine rotors used in jet engines or power plants. The task of balancing a completed rotor can be greatly simplified if the individual blades are first measured and sorted according to static unbalance moment. They are then assembled in the rotor in matched pairs, resulting in an assembly that is approximately balanced. A better balance can be obtained using the Space Electronics "SPACEBAL" software which compensates for hub unbalance and searches for a best fit solution involving all the blades, rather than limiting the selection to matched pairs. If the "moment weight" of each blade in an engine is stored in a computer data base, then a damaged blade can be replaced with one of identical moment, minimizing the unbalance which results from blade replacement in a repair facility. SINGLE AXIS VS. 3 AXES When balancing larger blades such as wide chord fan blades, the tangential, axial, and radial moments must be accounted for. To address this challenge, Space Electronics has developed the most repeatable and highest accuracy three axis moment weight scale on the market. This scale provides moment measurements in all three axes. For more information on three axis moment measurements, please visit our three axis moment weight scale page. MORE INFORMATION Basic Operating Concept - Moment Weight Scales Specific models:
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| Space Electronics LLC - 81 Fuller Way - Berlin, CT 06037 (USA) - Phone: +1 860 829 0001 - Fax: +1 860 829 0005 - Email: sales@space-electronics.com |
