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![]() TM 55-4920-201-14
unbalance force, introduced by addition of weight
unbalance is present in the assembly being checked.
w at distance d, is the same in all four views and
(See figure 7-2). Once this setting has been
represents the maximum permissible unbalance for
established, subsequent similar assemblies, using
the assembly. In view A, with the disc mounted at
the same setting, are directly indicated as "inside"
the lower end of the arbor, balance sensitivity is too
or "outside" balance tolerance limits by the relative
low to provide a visible indication of the small
position of the indicator circles. This feature
unbalance force. In view B, mounting the disc
eliminates the need for any calculations by the
higher on the arbor increases sensitivity so that a
operator; when the indicator bushing circle is
visible indication of the small unbalance force is
anywhere inside the black indicator disc circle, the
observed. By mounting the disc still higher on the
indicated unbalance is smaller than the balance
arbor, sensitivity is further increased until the
tolerance limit.
indicator bushing circle becomes tangent with the
7.14. EFFECT OF VERTICAL HEIGHT
indicator disc circle, as in view C. This is correct
SETTING ON SENSITIVITY OF UNBALANCE
sensitivity for the assembly (balance tolerance = w x
INDICATION. (See figure 7-2).
d). In view D, mounting the disc still higher on the
7-15. The bare disc in all four views of figure 7-2
arbor results in an excessive degree of sensitivity, or
represents the same balanced mass. The small
actual instability.
7-3
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