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The following are suggested steps for balancing a rotor using a multiplane balancing technique. The steps are applicable to a specific program; how-ever， other programs will require about the same information:
1.  Choose the number of balancing planes and install an equal or greater number of proximity probes. Install a tachometer that gives a once-per-revolution pulse anywhere on the rotor. Feed the tach signal and the probe signal from one plane at a time into a phase meter toindicate the rotating speed inrpm， the vibration amplitude in peak-to-peakmils， and the phase angle of the maximum amplitude in degrees from the tach pulse.

2.  Note the number of balancing planes and the balancing speed in rpmon Data Sheet A. Next， rotate the machine at a slow speed (less than

25. of balancingspeed)， and measure the initial runout amplitudeand phase in each plane.Now， rotate the machine at the balancingspeed， and measure the final vibration amplitude and phase in each plane. Record all this data on Data Sheet A.

3.  Take a blank Data Sheet B. Enter the plane number. Place a trial weight at any radius and any angle in that plane. Enter these valueson the sheet. Now， operate the machine at the balancingspeed， and measure the vibration amplitude and phase in each plane. Repeat the procedure for each plane. (Place only one trial weight in only oneplane at a time.)認hen finished， you should have as many Data Sheets B as the number of planes.

4.  Data Sheet C describes the options available to the user. Enter the proper choice for each option.
.ata Sheet .
Number of Balancing Planes  Speed in rpm
Amplitude  Phase 
Initial Run-Out Amplitude 
and Phase-In-Plane  1 
2 
3 
4 
5 
Final Vibration Amplitude 
and Phase Before 
Balancing In-Plane  1 
2 
2 
4 
5 

6.2  Gas Turbine Engineering Handbook 
.ata Sheet B  Plane    
Trial認eight  Radius  Angle 

Amplitude  Phase 
Vibration Amplitude and Phase In-Plane  1 
2 
3 
4 
5 

.ata Sheet C
Options
1. If
the same weight as the trial weight is to be used for balancing， then the program

will locate radius (NS1二 1). For computing the weight at a fixed radius. NS1二 2. NS1二 

2.  Radius at which balancing weights will be placed. If NS1二2， give the locating radius in each plane. (This is not applicable if NS1二 1.)

PlaneNo. 1 2 3 4 5
Radius
3. If
balancing is to be done to the initialrun-out， then NS2二 1.

If balancing is to be done to .eroamplitude， NS2二 2. NS2二 

4. If
add-on weights will beused， NS3二 1.If holes will bedrilled， NS3二 2. NS3二 

5.  If weights can only be placed or removed at a certain number of evenly spacedlocations， NS4二 1.If they can be placedanywhere， NS4二 2. NS4二 

6.  If NS4二1， then give the number of holes and the angle to the first hole in each plane.

Plane No. No. of Holes Angle of First Hole
1 2 3 4 5
Bibliography
Badgley，R.H.， ..Recent Development in Multiplane-Multispeed Balancingof Flexible Rotors in the .nitedStates，"" presented at the Symposium onDynamics ofRotors，I.TAM，.yngby，Denmark， August12， 1974.
Bently NevadaCorp.， ..Balancing RotatingMachinery，"" Report1970，Minden， Nevada.
Bishop，R.E.D.， andParkinson，A...， ..On the .se of Balancing Machines forFlexibleRotors，"" ASME Paper No. 71-Vibr-73.
Bishop，R.E.D.， and.ladwell，..M...， ..The Vibration and Balancing ofan .nbalanced FlexibleRotor，"" Jour al of Mecha ical E gi eeri g Society，Vol.1，1959， pp. 66-77.
　
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