Part number Description
8BA1 Balancing Compass
8BA25 Balance Scale and Weights
404B Phototach (infrared)
10.17.1 Balancing Compass
The Balancing Compass measures angular locations and relationships, which are essential
tasks when balancing rotating equipment. The Balancing Compass can help ensure more
accurate measurements and reduce the risk of error. You can measure and mark angles
some distance from each other. You do not need to place the Balancing Compass on the
plane of interest.
The Balancing Compass has two opposing 0-360 scales (one red and one black). Follow the
instructions shown on the label to match one of the two scales to the direction your
equipment rotates when running. Use the selected scale for all readings. Degree scaling
correlates directly to the Emerson convention of measuring angles and phase in degrees
counter to rotation.
Determine the location for a trial or correction weight
The Balancing Compass has a magnetic backing for mounting to any ferrous metal surface.
An axial face on a horizontal shaft is required for proper application.
WARNING!
Ensure that you remove the Balancing Compass before starting or operating the equipment.
Procedure
1. Align the rotor tachometer reference mark with any convenient stationary reference
mark, such as the tachometer pick-up or a mark at the access door.
Align the reference markFigure 10-8:
Balance
MHM-97432 Rev 7 361
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