You are 17 times more likely to introduce defects during equipment start-up than during normal equipment operation. Additionally, over 90 percent of rotating equipment has defects at start-up that result in premature equipment failures. What’s causing these start-up defects?
PRUFTECHNIK is opening new avenues in the area of geometric measurement of machine surfaces. With the newly released GEO CENTER software, PRUFTECHNIK eliminates the need for a handheld hardware device to check machine geometries in the field, such as measuring the flatness of machine foundations or the straightness of machine rails.
The Vibration Institute (VI) has worked with the Acoustical Society of America for over 40 years to develop standards on machine vibration measurement, monitoring, and analysis and certification of vibration analysts. During the last 4 years, the (VI) has sponsored an effort in conjunction with the Acoustical Society of America (ASA) to properly form and document a new comprehensive standard for shaft alignment.
Comments that we have heard in all types of industry are
“We always have the time or money to do the repair over, but never time or money to do it right”
. Many times when equipment fails there is an incredible rush to get the machine back online due to some production requirement. This usually leads to repairs that are inadequate or incomplete. It is important to remember that as long as your lock is on the machine it is not going to go back into service until you remove that lock. It could take as little as an additional 30 minutes to allow the machine to be repaired completely, but instead the job is rushed and a few weeks or a couple of months later the same machine is being repaired for the same reasons again. Production controls the purse strings that is a given, but generally product quality and maintenance cost can be better controlled by allowing for a complete repair not a partial fix. A couple of examples that come to mind are on belt driven machines. Many repair techs simply roll V-belts on and off for removal or installation. Have you ever noticed a V-belt running upside down? In most cases it is due to the cords in the backing of the belt being broken. This is usually caused from rolling the belts on or off the sheave. If “power band belts” are used the cost of those belts are usually higher than the sheaves that the belts are running on. It is a paradox that brand new belts will be installed on worn out sheaves. When the sheaves are replaced most of the sheaves are affixed to the shaft with a taper lock hub. How many people use an indicator to ensure that the sheaves are square to the shaft and not just tighten the hub with an impact wrench? How many are taking the time to precision align the equipment after replacing belts or sheaves? Poor alignment or incorrect installation are the most common causes of abnormal wear of sheaves and pulleys. There are others examples, but hopefully this drives the point home. Repairs need to be done in a timely fashion in cooperation with production to minimize downtime and reduce any effects on quality.
, the cloud-based shaft alignment system that combines precision measurement with mobile connectivity, has with the latest free firmware release 1.2 taken another leap forward.
he Greek physician Hippocrates (c.460 BC – c.370 BC) is credited with an oath that was meant to provide certain ethical standards a physician was to uphold. While maintenance is not of the magnitude as being a doctor, organizations would do well to apply portions of the Hippocratic oath to their maintenance practices. Two such examples are: “…
to teach them this Art, if they shall wish to learn it, without fee or stipulation; and that by precept, lecture, and every other mode of instruction, I will impart a knowledge of the Art to my own sons, and those of my teachers, and to disciples...”
I will follow that system of regimen which, according to my ability and judgment … and abstain from whatever is deleterious and mischievous.”
This article focuses on the latter, “
and abstain from whatever is deleterious and mischievous,”
or in 21st century vernacular: Do no harm.
A balance program developed for the lead phase measuring system was used for searching the effective two-plane balancing solution for the lag phase system of measurement for an overhung rigid rotor. This article presents the mathematical expression of the solution and its validation from the results of a test for two-plane balance by comparing calculated values using experimental data.