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# Mass Position Balancing

IP.com Disclosure Number: IPCOM000035774D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 41K

IBM

## Related People

Hasler, SS: AUTHOR [+2]

## Abstract

A method is described for balancing a rotating mass, such as a spindle, with a high degree of precision.

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Mass Position Balancing

A method is described for balancing a rotating mass, such as a spindle, with a high degree of precision.

The balancing of a plane on a rotating shaft is obtained by changing the position of setscrews 10 in radial holes set at right angles in a cylinder 11 (Fig.
1). Cylinder 11 is an added component on the spindle assembly or, if desired, the holes can be part of the assembly itself. Cylinder 11 is balanced by adjusting the hole length and screw length in proportion to the densities of the materials used.

(Image Omitted)

The method is illustrated (Fig. 2) by balancing air bearing motor 12 on balancing stand 13. Motor 12 contains two cylinders 11 on a spindle in two different planes. To balance the motor spindle, frequency response measurements were taken at analyzer 15, using the key phase signal 14 as the input signal, and accelerometers 16, 17 as the output at the two planes. The trial weight method was used so that with two balance planes, six frequency response measurements were made; one at each balance plane in the original state, one at each plane with the trial weight on the first plane only, and one at each plane with the trial weight on the second plane only. The addition of the trial weight was done by turning one setscrew 10 a predetermined number of revolutions and then returning to the original state by reversing the turns. The angular position and amount of imbalance at each correction plane was found by mathematical methods...