Posts by: Brad Case

The First Rule in Precision Shaft Alignment is “Don’t Assume”!

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By on October 6, 2017

This is an obvious statement and most of us know what happens when we do “ASSUME” with most things in life. However, we (The VibrAlign Trainers) see assumptions being made quite often during a precision shaft alignment. Several years ago, I read a book titled “A Millwright’s Guide to Motor/Pump Alignment” by Tommy “T-Hammer” Harlon […]

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Pipe Strain Was the Issue

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By on July 13, 2017

Have you ever struggled with a precision shaft alignment, even though you did everything right? (Preformed the pre-alignment steps, controlled backlash, etc., etc.) So, what was different? Maybe it was pipe strain. An alignment check of a new installation of a 40 HP, 3600 RPM motor/pump  revealed the vertical angular misalignment was 3.2 times the […]

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Save Time. Save Money.

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By on May 4, 2017

Time is a commodity maintenance personnel typically have in short supply. We hear quite often, in our on-site Shaft Alignment Best Practices training classes, “………. doesn’t give us enough time for a proper shaft alignment”. So how can maintenance personnel get more time for shaft alignment? Stop wasting it! I had the pleasure of working […]

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When an Alignment Check Turns into Starting from the Beginning.

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By on March 22, 2017

A recent NXA Pro training class performed an alignment check of a winch driven by an 80 HP, 1800 RPM, DC electric motor with a gear style coupling. The initial results revealed a misaligned machine, with a vertical angularity over 13 times the tolerance of 0.7mils/1” (1.0 mil = .001”), vertical offset six times tolerance […]

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The NXA Extended Alignment Function – What is it? When to use it.

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By on January 25, 2017

When training clients to use VibrAlign’s Verti-Zontal Alignment Process we show taking the 3rd measurement at a horizontal position, typically at 3 o’clock. This is simply for expediency and is NOT a requirement as Fixturlaser Shaft Alignment Systems can take measurements at any position due to the inclinometers in M & S sensors. If possible […]

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Back Off Jack Bolts for Improved Alignment Results

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By on December 14, 2016

Millwrights and mechanics know the benefits of using jack bolts to precisely control the horizontal position of the movable machine when performing a precision shaft alignment. However, we also see the tendency to tighten the jack bolts, on both sides of the movable machine, either before or after tightening the hold down bolts. Tightening jack […]

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Other Influences to Precision Shaft Alignment Results

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By on November 9, 2016

Over the years we have fielded several technical support calls from maintenance personnel having repeatability and soft foot issues (during an alignment) all of which had a common issue; other influences. Meaning not the typical looseness, coupling backlash, soft foot issues. During the “heat of the battle” to get the precision shaft alignment job finished […]

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Reduce Force to Maximize L10 Bearing Life

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By on August 17, 2016

Simply put, L10 bearing life is the number of service hours that 90% of bearings will survive or conversely 10% of bearings will have failed. L10 life: is the preferred term in specifying bearing life and is defined by The American Bearing Manufacturers Association (ABMA). A bearing life equation is: This calculation assumes proper installation […]

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Coupling Tolerances vs. Shaft Alignment Tolerances, What’s The Difference?

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By on June 24, 2016

Plenty! This question still comes up fairly often in our training classes. If you look any of the coupling manufactures installation instructions there is a chart for the maximum allowable misalignment based on the coupling size. These tolerances are for the coupling, what about the machines the coupling connects? Shaft alignment tolerances are more about […]

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If It Moves Your Laser Will See It

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By on March 30, 2016

Laser Shaft Alignment tools are a great asset for today’s maintenance professional, enabling them to perform precision shaft alignments to very tight tolerances; and do so quickly when using the VibrAlign Verti-Zontal Process. Laser alignment systems are a tool and as such show the user what is occurring “mechanically” during the alignment process, including if […]

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The Language of Alignment

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By on December 24, 2015

Rim & Face, Angle & Offset, Parallel & Angular Deviation, Parallel Offset, thousands of inch and mils! What does it all mean? Actually it’s pretty much the same thing, though not exactly. I’ve been a VibrAlign Technical Trainer since 2008 with training classes in a variety of industries and with students previously using other methods […]

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Do You Have Bar Sag?

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By on October 8, 2015

I’m not referring to what happens after you have had too many adult beverages at your favorite watering hole! I’m referring to the bars that holds your rim dial indicator(s) when performing a precision shaft alignment. Bar sag also called rod sag needs to be compensated for, should it occur, otherwise you are introducing a […]

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Using the AlignHot App (Hot Check) to Determine Thermal Growth Targets

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By on July 23, 2015

A previous blog of mine discussed the benefit of taking a set of hot alignment readings to verify if the offset targets used for a cold alignment, to compensate for thermal growth (dynamic movement), were correct.  http://thealignmentblog.com/blog/2015/04/15/benefit-hot-alignment-check/ So what if the actual hot alignment readings you get show a large difference from the anticipated hot […]

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The Benefit of a “Hot” Alignment Check

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By on April 15, 2015

There have been numerous posts on TheAlignmentBlog.com dealing with Thermal Growth and Dynamic Movement of rotating machinery. http://thealignmentblog.com/blog/category/alignment-troubleshooting/dynamic-movement/. Thermal Growth continues to be a subject that is discussed and taught in our training classes, though on a daily basis is not always correctly compensated for in industry. Many maintenance personnel performing precision shaft alignments use […]

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Uncoupled Shaft Alignment – It Doesn’t Need To Be Difficult.

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By on October 13, 2014

The night before the OJT portion of a recent Fixturlaser GO Pro Training class, at a Combined Cycle Power Plant, the shim packs of the disc type coupling between a 3300 HP electric motor and fluid drive began to fail. The machine was shut down before any damage could occur and was waiting for our […]

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