Bearing maintenance Flashcards
What kind of noise should a good bearing make when heard without a stethoscope
Soft purring sound like a motherfucking pussy cat
What is the temperature difference between the outer ring rolling elements and inner ring
The rolling elements are usually 20° hotter than the outer ring
The inner ring usually 30° hotter than the outer ring
What is meant by built in contaminants
Dirt that is introduced into the machine during assembly
What is meant by brinelling in a bearing
Impacted denting of the raceways
What are the two most common causes of vibration
Imbalance
Misalignment
Can all harmful levels of vibration be detected by hand
No most cannot be detected by hand at all (you will need other means of detection)
How can the condition of bearings monitored before they reach the last stage of deterioration
By taking vibration readings with the vibration data collector at regular intervals
What is the major cause of premature antifriction bearing failure
Contamination
Why is it important not to heat a bearing above 120°C
Pictures above 120°C can permanently distort the bearing
What is false brinelling
Dents worn into the raceway due to vibration of the rolling elements while the bearing is stationary
Was the main cause of lubrication breakdown
Heat
What are the two causes of electric arcing in bearings
Improper ground location when welding near a bearing
Static electricity
