In my early apprenticeship days a common task was to fit the pump to the motor. A simple task I hear you say. In those days it could take several hours because the motor and pump were bolted onto machined pads and had to be shimmed to get the coupling spot on line. The coupling had 4 rubber covered pins that were inserted into the mating half that had to have a small amount of movement. Our key fitting skills were also put to the test using micrometer blue to ensure a good fit.
One day we were given a different type of coupling called a “Taperloc”. It was so easy to fit and did not rely on the great accuracy and filing skills.
Since those days couplings have become easier to fit and Bell housings make it simple and more reliable.
There are still areas where we need to take care. Most pumps do not like Belt drives because the front bearing is not fit for the heavy side loading. However you can obtain easy use bearing units that fit neatly onto the pump.
I have had a pump shaft spline fail on motor a of 200Kw and created vibrations so severe that a structural engineers was called in to examine the building for damage.
Couplings are extremely important and often we tend to give them second thought.
Bob
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