Posts tagged with: soft foot

3 Common Reasons for Shaft Alignment Frustrations

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By on September 4, 2018

Achieving a perfect alignment can seem daunting at times, but it doesn’t have to be if you have the right tools and if you know to look out for three common reasons for shaft alignment frustrations. Once you know these three factors, you can take the necessary steps to avoid them and/or correct them. The […]

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Are Shims Causing a Soft Foot Issue?

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By on May 15, 2018

One of the many things I love about my job is the numerous challenges we face during the field alignment portion of our Precision Shaft Alignment Training. Prior to the training, there were some repeatability issues when attempting to perform a precision alignment on this piece of equipment. One of the main causes of non-repeatability […]

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You Can’t Perform Precision Alignment on Un-precise “Stuff”!

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By on May 11, 2018

Alan Garbers with Johnson Controls International contacted me regarding an alignment problem, and asked for my advice.  Here is a condensed version of his email. A client rents portable chillers, and related equipment. They built a 125HP portable pump skid with a Bell & Gossett pump on a VFD. I was there to commission the […]

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Channel Strut as a Motor Sub-base?

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By on April 12, 2018

At first thought it may sound like a good idea as the specialized fasteners in the channel make it easy to tighten the motor hold down bolts, however in reality it’s a cause for precision shaft alignment issues. Here’s why. A good pump/motor base is engineered to meet specific standards (IE: ANSI, API, etc.) with […]

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Challenging, But Not Impossible!

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By on April 3, 2018

As we trainers travel around the country conducting precision shaft alignment training, we often run into some fairly harsh work environments during the field portion of the training. At times the equipment that needs to be aligned is caked in product from spills or leaks. This can create a significant challenge when attempting a precision […]

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Should Soft Foot Be Corrected in Centrifugal Pumps?

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By on March 20, 2018

  In a previous blog I wrote in Jan of 2016 “Soft Foot Concerns in the Stationary Machine?” soft foot in the pump was causing repeatability issues during a precision shaft alignment. https://vibralign.com/other-topics/soft-foot-concerns-stationary-machine/ Soft foot can also distort the pump casing which can change clearances within the casing. This can shorten the life of the […]

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The Soft Foot Primer (Part 3) How to REALLY Minimize Soft Foot Every Time

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By on March 4, 2018

It is both possible, and desirable, to minimize the negative effects of soft foot.  While it may be difficult to completely get rid of soft foot, it can typically be reduced to a few mils, if the following techniques are used. PREPARATION AND CLEANLINESS CLEAN! If you remove the motor, wipe the feet clean, before […]

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The Soft Foot Primer (Part 2) Vibration and Alignment Problems Related to Soft Foot

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By on February 26, 2018

Most industrial maintenance mechanics who are involved with precision shaft alignment are familiar with the phenomenon of soft foot.  From an alignment standpoint, soft foot causes: Changes in alignment values, between when the hold down bolts are loose, and when they are tight. Non-repeatability in alignment measurements, especially if the bolts are not tightened in […]

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The Soft Foot Primer (Part 1) Are You Measuring Soft Foot, or Just Its Effect?

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By on February 19, 2018

Most laser alignment tools include a soft foot function. However, in truth these tools haven’t measured ACTUAL soft foot, instead they have measured the EFFECT of soft foot at the shaft or coupling as that is where the laser heads or sensors are mounted.  While the EFFECT of soft foot is important, correcting the ACTUAL […]

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Rolled Steel Frame Electric Motors

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By on August 9, 2017

In the precision shaft alignment business, we encounter all types of electric motors.  One type we come across are “Rolled Steel Frame” (RSF) motors.  These motors have a frame housing and feet that are made from mild, rolled steel.  They range from very small up to about 25hp.  They are common in many industries; however, […]

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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 One Tool Missing in Most Aligner’s Toolboxes

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By on January 18, 2017

I am going to pass along to you a gift – one that I believe could potentially cut your alignment times-maybe by more than half!  One that could lessen loosening and tightening bolts, reduce frustration, and increase your “alignment” confidence substantially!  Would you like such a gift? Well, here it is – measure your shim […]

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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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Get out of Trouble Before You Get into Trouble!

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By on September 30, 2016

It really doesn’t matter the industry; industrial maintenance technicians suffer the same frustrations when performing a precision shaft alignment. Our team of trainer’s travel all over the country conducting training classes for paper mills, steel mills, chemical plants, gas and oil, etc. What we hear is universal across all industry. “I can’t get repeatable results, […]

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Fudging Your Shims? Go The Same Direction.

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By on September 22, 2016

When performing a precision laser shaft alignment, it is best to add or remove shims exactly as the display unit indicates.  There are circumstances when this may not be possible due to your assortment of shims, or when you want to “fudge” your shims slightly to keep the total number of shims low. (Clink for […]

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