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Gimmick  Electrically or mechanically applied corrections to an arbor or piece of tooling such that the unbalance affects caused by the tooling are reduced.
Hard Support  Balancing machine with stiff work supports.  Parts rotate about its journal centerline and the centrifugal force caused by the unbalance, deflect the supports. Natural frequency of the supports is approximately ten times that of the machine operating speed. Setup accomplished by dialing in part dimensions. Calibration is fixed.
Hold Meter  Angle or amount meter that retains its reading after each read cycle.
Incremental The balancing of an assumed non-rigid rotor by re-balancing the assembly Balancing after each stage of the assembly is added and making the correction in the last assembled stage.
Repair
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20-00-02/70-00-01
Table 404. Balancing Terms and Explanations (Cont)
Term Explanation
Journal Centerline (Rotational Axis)  The rotational centerline of a rotor as determined by its bearing. 
Linear  A relationship between two variables such that the output is directly proportional to the input. 
Mass Centering  A balancing process where the principle inertia axis of a part is located and marked. 
Natural Frequency  The frequency at which a body will vibrate upon excitation from an outside force. 
Off Angle Correction  A correction made for an unbalance condition at an angle other than the angle of unbalance. 
Linear  A relationship between two variables such that the output is directly proportional to the input. 
Mass Centering  A balancing process where the principle inertia axis of a part is located and marked. 
Natural Frequency  The frequency at which a body will vibrate upon excitation from an outside force. 
Off Angle Correction  A correction made for an unbalance condition at an angle other than the angle of unbalance. 
Peak  The maximum on scale reading of the amount meter that can be obtained when tuning the filters of a tuned amplifier measuring system.  ("S" measuring) 
Sensitivity  The smallest amount of displacement the balancing machine can detect and display accurately on the amount meter. 
Set Up  A sequence of adjustments and operations 
(Programming)  on a balancing machine in order to accurately read the angle of unbalance and amount of correction necessary in units usable to the operator. 
Single Pass Correction  The ability of the balance measuring system to read the unbalance and the correction system to apply the proper sized correction on angle and in plane such to reduce the amount of unbalance with a single correction effort. 
Soft Support  Balancing machine with flexible work supports.  Part rotates about its principle inertia axis (as it would in free space) and the journal movement deflects the work supports. Natural frequency of the supports is one-fifth of the lowest operating speed of the machine. 
Theory of 180 degree  A method of calculating the unbalance turn caused by rotating the tooling of a balanced assembly radially 180 degrees relative to the work-piece. The resulting amount is equal to exactly twice the unbalanced caused by tooling. 
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Repair
20-00-02/70-00-01
Table 404. Balancing Terms and Explanations (Cont)
Term  Explanation 
Tooling  The additional apparatus that is used to attach and support the work-piece in the balance work supports or to the spindle.  Tooling is what stays on the balance. 
Translation  Motion in which at any instant every point on the journal centerline is moving in the same direction and at the same velocity as every other point. 
　
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