QUICKLINKS
Moment Weight
• Moment weight scales
• Operating concept
• Features of single axis scales
• Three axis scales
• Blade adapters
• MW900 model
• MW12K model
• MW20K model
• MW40KF model
Services
• Blade Balancing Service
Know-How
• Definition of Accuracy Terms
• Accuracy Tips for Blade Balancing
• Pan Weighing vs. Moment Weighing
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MODEL MW20K - SINGLE AXIS MOMENT WEIGHT SCALE
| Readout Resolution |
0.01 oz-inch |
| Readout Sensitivity |
03 oz-inch |
| Typical Relative Moment Measuring Error* |
0.06 oz-inch |
| Maximum Relative Moment Measuring Error* |
0.10 oz-inch |
| Maximum Radial Moment that can be measured **
|
20,000 oz-inch |
| Basic Moment Range |
2000 oz-inch |
| Absolute Error (Basic Moment Range) *** |
0.1 oz-inch |
| Absolute Error (Extended Moment Range) *** |
0.20 oz-inch |
| Maximum Combined Weight of Blade and Tooling |
100 lb. |
| Maximum Combined Moment of Blade and Tooling |
30,000 oz-inch |
| Mounting Plate Radius **** |
200 mm (7.874 in) |
| Mounting Plate Dimensions ***** |
A7169305 |
*
Using master blade to set
reference. Tooling error is not included.
**
Tooling is first counterbalanced before
installing blade in adapter.
Built-in range
weights are used to achieve full range
on MW models
*** These are guaranteed limits (not
including tooling error).
This assumes an environment which is free from excessive
vibration and
movement and has a stable temperature. Typical accuracy of our
machines is better than 0.0005% of "maximum radial moment that
can be measured".
**** Distance from fulcrum to vertical
adapter mounting service.
***** Alternate mounting plates are
available. |
|
The MW20K scale measures the radial moment of turbine blades and is also capable of
measuring the weight of the blade. This scale uses force restoration technology and
crossed-web flexure pivots and has negligible error due to blade CG height. The system
includes an IBM compatible computer, which displays the measured moment weight. Data is
stored on the computer hard drive and can be accessed by a computer network. If special
software features are required for interfacing with a database program (such as
PWBAL),
please contact us for a specific quotation.
Optional Model SE90023B Calibration System This
calibration system bolts directly to the interface of the moment weighing system. It can
be used to establish the exact radius of the mounting plate and also can be used to
calibrate the moment readout and the mass scale. Accuracy of this calibration system is 5
times better than the accuracy specifications for the system. Mass and distance are
traceable to NIST. |
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