Lube Flashcards
What two things are bearings lubricated with?
Oil
Grease
What do we use for severe applications?
Synthetic and dry lubricants
Advantage of grease over oil?
Easy to contain in housing.
Disadvantage of grease?
Low to moderate speeds
Advantage of oil?
High speed high temperature applications
Removes heat from bearing
What causes skidding?
Too high viscosity oil or grease
What causes friction?
Too low viscosity oil or grease.
Two types of lubricating oil?
Petroleum
Synthetic
Advantage of petroleum?
Least expensive widely used
Advantage and disadvantage of synthetic oil?
High temperature range 700 degrees and up. And high speeds.
More expensive
What do we use dry lubricants for?
Low speed, extreme temperatures
How much of the lowest rolling element in a housing must be submerged in lubricant?
One third to one half of the lowest rolling element in the housing.
What are linear bearings?
Move on one dimension with low friction.
On linear bearings what is the support component called?
Rail, way, or guide.
What are the two types of seals?
Contact and non contact.
What are seals used for?
Keep contaminates out and lubricant in.
Two types of seals?
Shielded or seals.
Advantage of non contact seals?
Can operate at very high speeds.
Advantage of contact seals?
Prevents loss of lubricants.
What causes more bearing failure then metal fatigue?
Poor lubrication
Contamination
Misalignment
What are the mounted bearing types?
Pillow block
Flanged cartridges
Cylindrical cartilages
Take up bearings
What are piloted flange cartridges used for?
Better mounting accuracy and more support
What is a take up bearing?
Adjust center distances between shafts or belt tightening
What are the two locking types form the shaft to the collar?
Set screws
Cam lock collar
