Many vibration programs fail because they become too complicated. Too much data can sometimes become more confusing than too little data. Many potential machinery problems can be eliminated with
The topic of "certification" is one that still comes up regularly in our courses and in discussions among thermographers. The primary question, as it has been in the 27+ years I've been in this
Used successfully for short rotors such as: -overhung fans up to 2m diameter, -pump impellers on mandrels (using a pot magnet as the swing weight).
Also on smaller fans with two bearings that are nearer to "long" rotors.
How used for a 10-stage pump of the ring-section design (where each impeller is assembled in turn with its matching stationary section): -Parallel ways were clamped to the bed of a milling machine. -Balance correction was made on the adjacent machine using an end milling cutter. -A table was calculated and drawn up giving the depth of cut required in each case. -Position was marked clearly on the impeller: machinist cut the required mass from the back shroud.
Rotor must be in rolling element bearings, or set up
When a motor is not properly cared for during storage damage to its bearings may occur. The two main failure modes that occur are false brinelling and static corrosion.
False brinelling occurs
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