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 MW12K - SINGLE AXIS MOMENT WEIGHT SCALE
| Moment measurement specifications. |
|
Maximum radial moment that can be measured * |
12,000 oz-inch |
|
Maximum additional moment of tooling |
8,000 oz-inch |
|
Maximum combined weight of blade and tooling |
60 lb. |
|
Range of indication. |
2000 oz-inch |
|
Readout resolution |
0.01 oz-inch |
|
Readout sensitivity |
0.02 oz-inch |
|
Moment linearity (0.0025% of measurement range) |
0.05 oz-inch |
|
Relative radial moment measuring error ** |
0.07 oz-inch |
|
Absolute radial moment measuring error (0-2000 oz-inch) *** |
0.1 oz-inch |
|
Absolute radial moment measuring error (2000-12,000 oz-inch) *** |
0.15
oz-inch |
| Mounting Plate |
|
Mounting plate radius **** |
5.000 inch |
|
Mounting plate dimensions ***** |
A2499019 |
|
*
Tooling is first counterbalanced to zero moment
** Using master blade to set reference. Tooling error is not included.
*** These are guaranteed limits (not including tooling error).
Typical error is less than
1/2 of this value.
**** Distance from fulcrum to vertical adapter mounting surface
***** Alternate mounting plates are available
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The MW12K scale measures
the radial moment of turbine blades. This scale uses force restoration technology with
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. This scale includes a set
of range weights to permit measurement range to be extended to 12,000
oz-in.
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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