Posts tagged with: “precision alignment”

Precision Shaft Alignment of Machines With Small Diameter Shafts

| | | |

By on April 27, 2017

A VibrAlign customer recently called, stating they were having repeatability problems with aligning a small motor to gearbox to pump.  After some phone conversation, I asked if they could send me photos of the machine, and the discrepancy in the measurements.  After seeing them, I knew what the problem was.   Machines with small diameter […]

Read More

Is there such a thing as “Too Good” of a Precision Shaft Alignment?

| |

By on April 6, 2017

This question comes up frequently in our Shaft Alignment Best Practices training classes. The result screens below both show two different aligned machines meeting 3600 tolerances.   The question is; is one better than the other? There has been a lot of discussion about this very topic. The theories are abundant and points of view […]

Read More

Repeatability vs. Desired Outcome in Shaft Alignment, Part 2

| | | |

By on December 2, 2015

In my last post, we looked some reasons for non repeatable, or when “two plus two doesn’t equal four”. This time, let’s think about when we don’t get an expected or desired outcome when we shim and move. Think of it as when “two minus two doesn’t equal zero.” You may perform an alignment measurement, […]

Read More

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

| | | |

By on October 14, 2015

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, which is, performing the same measurement twice, and getting the same results. If alignment results […]

Read More

Pry Bars, Sledge Hammers and Come Alongs – Oh MY!

| | |

By on July 16, 2015

Precision alignment of rotating equipment is a task which requires precision. Those of us who perform this task are asked to position big, heavy machines to tolerances often less than the thickness of a human hair. The measuring tools used to perform shaft alignment are quite capable of successfully showing us how to position these […]

Read More

Is Precision Shaft Alignment Really Worth the Time?

| | |

By on July 7, 2015

Check out Stan Riddle’s article that appears in the July issue of EPnews that is published by our friends at Empowering Pumps.   http://empoweringpumps.com/is-precision-shaft-alignment-really-worth-the-time/?utm_campaign=Empowering+Pumps&utm_source=hs_email&utm_medium=email&utm_content=20410553&_hsenc=p2ANqtz-8wDAT0u6imImafDL0h66xtUJrPlUp3asbpte8HTcflZB1DHqU1-TWloPcXHoBv71NTWae9KWqOQ0kprU2t58atzGdYaA&_hsmi=20410553

Read More

Help Your Laser Shaft Alignment System See!

| | |

By on November 13, 2014

For precision shaft alignment, nothing beats a good laser alignment tool. But the best of tools can have errors, or not even work at all, if the Sensors (detectors) can’t “see” the laser beams! We received a customer support call, and the aligner stated that his laser alignment tool wasn’t repeating. This is a rare […]

Read More

“Electrical Pipe Strain?”

| | | | |

By on November 6, 2014

Precision shaft alignment of rotating equipment is an essential part of any solid preventative maintenance program. To accommodate aligning any type of machinery you must be able to move one of the elements of the machine to achieve a precision shaft alignment. There are many limiting influences that could cause you to not be able […]

Read More

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

| | | | |

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 […]

Read More

Coupling Alignment Tolerances vs. Shaft Alignment Tolerances

| | | |

By on October 8, 2014

A coupling alignment tolerance and a shaft alignment tolerance are different things – VERY different things! A Coupling Alignment Tolerance is often (but not always) the maximum amount of misalignment the coupling will operate at before premature failure. A Shaft Alignment Tolerance is the maximum amount of misalignment the shafts can tolerate before they begin […]

Read More

Use your Head Not Your Hammer!

| |

By on October 2, 2014

Many of our classroom discussion topics relate to problems in the field when attempting a precision shaft alignment of rotating equipment. One such topic is how to move a piece of equipment horizontally that does not have jack bolts already mounted on the base. The obvious answer is to mount a set of jack bolts […]

Read More

Machine Train Shaft Alignment Tricks

| | |

By on September 10, 2014

Simply stated, a machine train is when three or more machine components are coupled together, acting as one.  Machine train alignment can sometimes be a complicated task. Some laser alignment tools can measure machine trains of up to several machines, simplifying the move options.  Whether you have a machine train program or not, by using […]

Read More

VIDEO: Concepts of Shaft Alignment – Measuring Runout

| | | |

By on August 28, 2014

The 4th video in VibrAlign’s Concepts of Shaft Alignment video series is entitled  “Runout”. The video describes what runout is and depicts how to properly measure for runout to determine if coupling eccentricity and/or a bent shaft is the source of the runout. The video series was based on ideas for visualizing alignment created by […]

Read More

How to Perform a Precision Alignment When Nearby Machines Are Vibrating.

| |

By on August 6, 2014

Equipment rooms can sometimes have numerous machines running all at once-side by side.  Often, technicians are required to perform a precision alignment next to a machine which is running.  The technicians are right to be concerned about vibration from nearby machines, but the concern can be greatly reduced if certain procedures are followed. The first […]

Read More

Creative Sensor Mounting When Flexible Couplings Limit Space.

| |

By on July 17, 2014

In this situation, there is little or no room to mount the laser sensors to the motor and pump.  What would you do?  You could remove the entire coupling and do an “uncoupled alignment”.  Or, be creative…                       Remove ½ the flexible coupling.  Then mount […]

Read More