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By Michael Keohane on January 23, 2019
By Michael Keohane on January 23, 2019

Blog post -

THE GOAL of a precision alignment is to align the machine within tolerance!

The goal of a precision alignment is to align the machine within tolerance when at operating condition. Many, but not all, machines are aligned without the need to compensate for offline to running (OL2R) movement most often associated with thermal growth.

A previous blog post (see link below) discussed how to read an alignment report when thermal growth compensation isn’t required.

On the machine in question the O.E.M. manual instructs the user to compensate for thermal growth in a couple of steps:

1 – Align to tolerance.

2 – Add 14 thousandths (mils) additional shim to all four feet on the motor and recheck.

3 – After rechecking add 18 thousandths (mils) to the front foot of the blower.

With many laser shaft alignment systems this can be simplified by adding the thermal growth targets prior to starting the alignment. This greatly streamlines the alignment process and provides documentation that the alignment was completed to tolerance using thermal growth compensation.

Targets Input Using the Fixturlaser NXA Pro

The OEM’s targets of +18 mils at the front feet of the blower and +14 mils under the motor feet are entered into the Fixturlaser NXA Pro as shown below. There is no compensation in the horizontal plane.

Alignment report showing in tolerance with Targets

The Green coupling icons indicate the alignment is within tolerance vertically and horizontally for an 1800 RPM machine.

The red thermometer icons indicate targets to compensate for thermal growth where used for this alignment.

The values to the right of the thermometer icons indicate vertical plane targets of +18 at the front feet of the blower and +14 at the front and back motor feet. No targets were inputted for the horizontal plane.

The report shows all necessary information on a single page.

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Hans Svensson

Press contact CEO +46 31 706 28 00
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Ulrika Rafstedt

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Kristian Palmdahl

Press contact Area Manager, Acoem AB +46 729 84 05 35

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Since the very beginning in 1984, ACOEM AB has helped industry throughout the world to achieve more profitable and sustainable production. We have reached where we are today by having the courage to think beyond the norm and follow slightly unconventional paths. We have had the courage to make mistakes and find new directions. Through our resolve, ambition and knowledge we have become a global player and a leader in innovative, user-friendly shaft alignment.

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During our almost 30 years in the industry, we have drafted, adjusted and experimented more than anyone. Some might say we are incurable innovators whereas others might say that we are highly focused. They probably have a point. If we hadn't been devoted and ambitious, we wouldn't have been the first in the industry to have a touch screen. Nor would we have been pioneers in the use of visible lasers and dual measuring heads.

Over the years, we have learnt to never compromise on quality and we are constantly in search of new, unexplored opportunities by combining advanced technology with design and function. By doing so, we have become the leading innovator in our sector. Not only do we minimize wear, production stoppages and costs, we also help save the environment. Natural resources are in short supply and if we can contribute to a more sustainable world by making it a little bit straighter, we couldn't be happier.

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