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Balancing machine:: A machine which will rotate the rotating element of another machine at various applicable speeds and indicate that (usually) metal must be added or removed to the effect of less off-balance induced vibration of the rotating element in question.
Bar sag:: Like it or not, gravity is constant, unforgiving, and even dependable. Focus on the dependable part. USE it. Once it s determined how much bar sag can be depended on under given conditions, anticipated bar sag in alignment becomes your most dependable ally. See the chapter on: Indicator sag and thermal expansion.
Bare shaft unit:: Said term is basically self-explanatory. It s a unit that doesn t currently have an installed coupling. Aligning to such a unit is best accomplished with a standard Reverse Dial indicator format or if it s impractical to rotate said bare shaft, use an applicable format from the Single Side Reverse Dial chapter in this book.
Battle scars:: More millwright jargon meaning physical/visible evidence of abuse that leaves a particular surface in an obvious less than pristine condition.
Bearing:: See Drive bearings or Driven unit bearings.
Bearing Centerline:: Very often the center of a bearing will be one of the axial addresses along the length of a given shaft where shim activity will occur per applicable calculations, for example, the latter half of the Squirrel Cage Fan Solutions chapter. In said chapter, sometimes the centerline of one bearing is the zero dimension pivot point, sometimes the other. Within said...

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A Millwrights Guide to Motor/Pump Alignment, Second Edition

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