Page 256 - Machinery Component Maintenance

Chapter 6

Balancing of Machinery

Components*

This chapter contains some of the theoretical aspects of balancing and
balancing machines, to give a better understanding of the process of bal-
ancing a rotor and of the working principles of balancing machines.?

Definition of Terms

Definitions of many terms used in balancing literature and in this text
are contained in Appendix A. Commonly uscd synonyms for some of
these standard terms are also included. For further information on termi-
nology, refer to IS0 Standard No. 1925 (see Appendix 6-C).

Purpose of Balancing

An unbalanccd rotor will cause vibration and stress in the rotor itself
and in its supporting structure. Balancing of the rotor is therefore neces-
sary to accomplish one or more of the following:

1. Increase bearing life
2. Minimize vibration
3. Minimize audible and signal noises
4. Minimize operating stresses
5. Minimize operator annoyance and fatigue
6. Minimize power losses
7. Increase quality of product
8. Satisfy operating personnel

* Copyright Schenck Trebel Corporation, Deer Park, N.Y. Adapted by permission.
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