BS 6861-1:1987

National foreword
Committees responsible
Method
0 Introduction
1 Scope and field of application
2 References
3 Pertinent aspects of the balancing problem
4 Permissible unbalance related to rotor mass
5 Quality grades relating service speed and
    permissible residual specific unbalance
6 Determination of balance quality requirements
7 Allocation of permissible residual unbalance to each
    correction plane on the basis of Uper
8 Determination of the residual unbalances
9 Sources of errors in balancing
Annex
    Example for the general method described in 7.3.3.1
    for two-plane balancing
Tables
1 Balance quality grades for various groups of
    representative rigid rotors
2 Typical examples of recommended deviations
Figures
1 Different representations of the same state of
    unbalance of a rigid rotor
2 Maximum permissible residual specific unbalance
    value corresponding to various balance quality
    grades
3 Rotor dimensions to be used for simplified method
4 Rotor with overhung discs at both ends
5 Rotors with couple correction planes I and II at a
    distance b less than one-third of the bearing span l
6 Rotor dimensions to be used for general method
    calculations
7 Determination of the reponse of the permissible
    residual unbalance to a trial mass
8 Test procedure for determining the residual
    unbalance in one plane
9 Error sources in end-drive elements
10 Rotor dimensions

Gives methods for the determination of permissible residual unbalance and for allocating it to the correction planes.