Transcription of VI Balance Grades
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VI Balance Grades
Balance Grades : Electric Motor Experience Vibration Institute Piedmont Chapter 14. 12/01/2006. Clay Boyd, PE. CBM Analyst 704-382-3608. References Schenck Trebel Corporation 535 Acorn Street Deer Park, NY 11729. Toll Free: 1-800-873-2352. Motor Repairs Motor Repair Specification Balance Grades Initial Balance with Shop Balance Machine Final Balance with Motor Assembled Motor Repair Specification Work to be performed Acceptable Repair Practices Required Reporting Acceptance Criteria, including Balance grade . Balance Grades Balance Grades are used to specify the allowable residual imbalance for rotating machinery. The ISO 1940 standard defines Balance Grades for different classes of machinery. (Rigid Rotors Only*). Example: Balance grade is recommended for Steam Turbines, Machine Tools and Small Electric Armatures. * ISO 11342 defines the Balance quality requirements for rotors in a flexible state Balance Grades : Sample Chart Permissible Residual unbalance per unit rotor weight (g*mm/g*1000) or Permissible cg displacement (mm*1000).
Balance Grades Balance Grades are used to specify the allowable residual imbalance for rotating machinery. The ISO 1940 standard defines balance grades for
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