What is the correct level of lubrication in an oil bath for an anti-friction bearing? 1/3 of Lowest rolling element
The constant level bottle ( Drop feed
... [Show More] ) oiler must be installed on the proper side Of the bearing housing, why is this Putting it on the wrong side will draw in oil and fill the housing.
List the three types of nozzles used in oil mist lubrication and their applications Spray fitting, Condensing fitting, mist fitting
On Block lubrication systems a) the no-flow valves serves what purpose and b) rupture discs serves what purpose A)no-flow will Shut down machinery or provide a signal if flow is interrupted B)Rapture disc indicate blockage in final delivery lines
When filling a pillow block housing with grease, the housing should be filled to what amount 1/3 lowest rolling element
List the three types of dry solid lubricants and their application *Graphite - Pins and bushings where moisture is present
*PTFE(Teflon) - Bonded to the surface of crank and rod bearings in large engine oil
*Molybdenum Disulphide - Anti-wear additive in engine oil
Proper grease selection depends on many factors, name 3 Speed, temperature, load
Which lubricant is better oil or grease for high speeds Oil
How should drums of lubricant be stored and for what reason On its side to keep tops clean
Oil analysis is important, name 3 things it can tell us Type of metal in oil, Silicone in oil, change in viscosity
If an oil sample indicates a change in viscosity what could be the reason for the change Oil is contaminated or oxidized
Flushing or using a filter cart when installing new oil is recommended, why. Filter oil of contaminants
When selecting a lubricant which would be best in helping with sealing effectiveness greace
Which type of lubricant has the better viscosity range Oil
What is the purpose of a thickener in grease Acts like a sponge and hold oil also helps sticks to surfaces
What are the three more common forms of friction? Sliding
relling
fluid
Sliding, relling, fluid of the three which one has the least amount of friction? fluid has the least amount of friction
Are liquid and gas both considered fluids Yes
Lubrication has many functions, name four of them you think are important. -To help Seal
-Carry away Contaminants
-Carry away heat
-Protects from corrosion of the surface
To form an oil wedge (full film), the shaft must reach a _______speed. Certain Minimum
the How does an increase in viscosity affect the power consumption of a machine? The higher viscosity the higher the internal power consumtion
What is the worldwide accepted unit of viscosity measurement? -The centistoke
-The SUS (or SSU)
What are the factors that affect the viscosity of oil? temperature, speed, Pressure
Generally, what is better? A high VI number or a low VI number Higher VI
What would the pour point of an oil be if it showed no movement when held horizontally for 5 seconds at 12 C. 15°C - add 3° to final pour point
What does the "W" signify in automobile oils Winter
What common percentage of an oil are additives? 22%
Explain hydrodynamic lubrication? uses the rotation of the Shaft to form an oil wedge that forces full fiilm of fluid into the loaded area.
What type of viscosity would be best suited for high load capacity situations? High viscosity
Define full film lubrication thick enough to completely separate the surfaces With a continuous film
Define boundry lubrication does not completely separate the Surfaces so some of the tips of the as perities touch
What is the difference between emulsified and demulsified with regards to oil and water -Emulsified is whey they Mix
-Demulsified will not mix
What is friction? the resistance that one surface or object encounters when moving over another.
A lubricant's main job is to Reduce resistance
Viscosity is a measurement of the fluid's resistance to flow.
As the temperature of an oil increases, viscosity___________. decreases.
The amount of change in the viscosity over a temperature change is referred to as viscosity index.
An oil wit [Show Less]