Cardan Shaft? Spacer Shaft? What Kind Is It?

Recently, I provided training for a location that had vertical mounted electric motors driving pumps that were one or more floors below them. In this case, these pumps were driven with Cardan Shafts, however they did not have the typical 5-to-15-degree angles (between the motor & pump shafts and the drive shaft) recommended for lubrication…

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