MOUNTING LOCATIONS

Where a vibration sensor is placed will not only affect the precision of the measurement, but also the accuracy. If readings are taken at a location different from the location of the previous readings, the repeatability will be lost. The placement of vibration sensors must be standardized to allow little room for variation. I have found that marking reference points with a marker or paint is the best bet when more than one person will be taking readings. However, there are aesthetic considerations before just doodling on a machine.

As with any system it becomes necessary to establish identifying terms. A manufactured part can develop many descriptive names, but the one used will be the one that is short and concise. For example, when my car needed an "upper engine torque strap", my mechanic installed a "dog bone", a name derived from the unique shape of this component.

With a PdM program most identifying terms have been established by various organizational standards. The simplest manner to label mounting locations is to number in the direction of power transfer. These points are often referred to as bearing positions or just "positions". Position identifications for most machinery can be illustrated in the following sketches.

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Last updated: November 24, 2002