Archive for the ‘Repeatability’ Category

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Repeatability vs. Desired Outcome in Precision Shaft Alignment, Part 1

When mechanics align rotating machinery, they expect two outcomes. One, they expect their alignment values to be repeatable. Two, they expect shimming and moving machinery to produce a desired outcome-namely, to be in tolerance. In this paper, we’ll discuss repeatability, […] Read More

REAligning America

Don’t Overlook the Hold Down Bolt Washers

Anyone involved in precision shaft alignment knows that unintentional movement is the biggest contributor to non-repeatable alignment results. Movement can come from several sources: Soft foot, loose bolts, flexible bases, excessive bearing clearances, improperly mounted or loose sensor mounting hardware, […] Read More


The Importance of Roughing-in Machines before Performing a Shaft Alignment.

During our Best Alignment Practices Training classes our staff of VibrAlign Trainers stresses the importance of rough aligning the machines as part of the pre-alignment steps.  The main reason to do so is to minimize the coupling influences on the […] Read More

Uncoupled alignment

Aligning Uncoupled Machines

Normally, it is faster and more accurate to perform shaft alignment while the machines are coupled together.  This offers several benefits such as:  Keeping the relative angular positions of the shafts the same allows the technician to align the true […] Read More

shim stack

Stacking the Deck Can Get You in Trouble!

The photo to the right was taken at a recent training class. The maintenance guys at this facility were excellent aligners. They were adamant about getting their shaft alignments to “better than excellent” levels. They believed in preparing the surfaces […] Read More

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How to Convert Dial Indicator Specs

How do you convert dial indicator specifications to laser alignment specifications? We often ask customers “what is your alignment specification or tolerance that you are trying to achieve?” What we hear most of the time is “zero” or “two thou” […] Read More

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Cupped Washers

The OJT portion of a recent training class was the alignment of a 3600 RPM electric motor driving a Bell & Gossett Fire Service Water Pump. As the hold down bolts were tightened (in a cross torque pattern) the horizontal […] Read More

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Jacking Bolts

Jacking bolts provide a smoother, easier way of moving machinery than using pry bars and hammers. Their use will almost always speed up the shaft alignment process, prevent excessive minor moves back and forth, and generally make the task of […] Read More