SINGLE AXIS MOMENT WEIGHT SCALES
Detailed Benefits

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. On the other end of the range, additional range weights expand measurement range up to 1 part in a million.

• 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.

• Computerized blade selection (optional) - An on-line computer acquires the moment data and serial number for each blade.  After a blade set has been measured, the operator enters the unbalance of the rotor hub on the computer keyboard, and the computer selects the specific blade for each location so that the unbalance of the rotor disc is compensated for by an equal and opposite net unbalance in the blades.  If production blades are being measured, then the computer can print a list of matched pairs.

• Easy to use - The computer also tells the operator how to run the machine, using a step by step procedure which runs on a Windows operating system (supplied).  All operations are menu driven with simple instructions.  The keyboard is used for operator entries.  Reports are automatically generated on the printer and data is stored on the computer hard drive.  This data can be accessed through a network.   The blade moment is displayed on a digital readout on the computer CRT.  If desired, the computer can print a stencil, so the moment can be etched on the blade (optional feature).

• Optional tool selection software - A specific adapter is required for each blade to be measured.   Relatively unskilled operators can use this system because all necessary information is automatically loaded into the computer when the operator enters the blade part number.  The computer chooses the adapter, and activates the specific high and low moment limits for the particular blade chosen.

• Blade optimization - An optional blade optimization software calculates the optimum blade arrangement that minimizes the residual unbalance of the rotor. Unbalance of the hub can be entered to take it into account in the balancing process.

MORE INFORMATION

   Main Moment Weight Scale Page

   Basic Operating Concept - Moment Weight Scales

   Detailed features - Three Axis Moment Weight Scales

   Blade Adapters

Specific models:
      Model MW900 Single Axis Moment Weight Scale - 900 oz-inch capacity (5,000 oz-in with range weights)
      Model MW12K Single Axis Moment Weight Scale - 12,000 oz-inch capacity
      Model MW28K Single Axis Moment Weight Scale - 28,000 oz-inch capacity
      Model MW40KF (3)Three Axis Moment Weight Scale - 40,000 oz-inch capacity