2Nd Year Bearings And Lubrication

Front 1

What is friction

Back 1

Resistance of movement of two surfaces in contact

Front 2

What are the 3 common forms of friction

Back 2

Sliding

Rolling

Fluid

Front 3

What form of friction has the most friction

Back 3

Sliding

Front 4

What form of friction has the least friction

Back 4

Fluid

Front 5

What are liquids and gasses both considered

Back 5

Fluids

Front 6

What are 3 important jobs of lubrication

Back 6

Reduce friction,

Protect against corrosion,

Dissipate heat

Front 7

What is needed to form an oil wedge

Back 7

Minimum shaft speed

Front 8

What are the effects of viscosity on a machines power consumption

Back 8

Increased friction increases power consumption

Front 9

What is the worldwide accepted unit of viscosity measurement

Back 9

Centistoke cSt

Front 10

What is viscosity index

Back 10

Change in viscosity over a range of temperatures

Front 11

What is better a high or low VI

Back 11

Higher is better

Front 12

How do you determine pour point

Back 12

3 degrees over the gel temperature

Front 13

Does w in 10w30 mean weight?

Back 13

No

Front 14

What common percentage of oil are additives

Back 14

22 percent

Front 15

What temp are petroleum based oils stable

Back 15

Up to 55 celsius

Front 16

What temp are synthetic oils good to

Back 16

250 celsius

Front 17

In an oil bath arrangement how high should the oil bath be

Back 17

1/2 to 1/3 up the lowest rolling element

Front 18

What kind of lubrication system are ring and chain

Back 18

Mechanical

Front 19

What is the most suitable type of nozzle for high speed lubrication systems

Back 19

Mist nozzle

Front 20

What is the drop point

Back 20

Lowest temperature that the oil separates from the grease

Front 21

What are the 2 main factors of proper grease selection

Back 21

Speed, temperature, and load

Front 22

Do 90% of bearings fail as a result of over lubricating

Back 22

No

Front 23

How much should you fill a bearing housing with grease

Back 23

One third full

Front 24

What is a load that is perpendicular to the shaft

Back 24

Radial load

Front 25

What is a load in line with the shaft

Back 25

Axial load

Front 26

What are the 2 main functions of journal bearings

Back 26

Holds the journal in location and supports intended radial load

Front 27

Describe the common construction of a thin shell split bearing

Back 27

Steel backer

Copper middle

Babbitt overlay

Front 28

What 2 seats are available on a thick walled split beating

Back 28

Plain and spherical

Front 29

Is there a difference in load and speed capacity of a split shell vs a solid bushing

Back 29

No

Front 30

What can cause oil whirl

Back 30

Unsteady load at high speed

Front 31

What is one type of bearing that can combat oil whirl

Back 31

Lobed bearing

Front 32

What provides the full film lubrication on hydrostatic bearings

Back 32

External pumps

Front 33

What do hydrodynamic bearings rely on to create full film lubrication

Back 33

Rotation

Front 34

What type of thrust bearing can handle the greatest load and in what direction

Back 34

Tilting pad in the axial direction

Front 35

What property allows abrasives to become entrapped in the bearing material

Back 35

Embedability

Front 36

What property allows the bearing to not weld and seize to the journal during startup

Back 36

Compatibility

Front 37

What ensures good heat transfer in split bushings

Back 37

Crush

Front 38

What are locking tabs and notches good for

Back 38

Ensure the split bearing is located properly and will not rotate.

Front 39

Should you use a soft blow hammer to install a bushing

Back 39

No

Front 40

What are 3 methods to check bearing clearance in journal bearings

Back 40

Plastigage

Lead wire

Direct measurement

Front 41

What are the components of a roller bearing

Back 41

Seals,

Raceway,

Rolling elements,

Outer ring

Inner ring

Cage

Front 42

Back 42

Cylindrical roller thrust bearing

Front 43

Back 43

Four point contact ball bearing

Front 44

Back 44

Deep groove single row ball bearing

Front 45

Back 45

Spherical roller bearing

Front 46

Back 46

Single row tapered roller bearing

Front 47

Back 47

Thrust ball bearing

Front 48

What bearing requires the least amount of radial space

Back 48

Needle bearing

Front 49

What rolling element has more contact area ball or roller?

Back 49

Roller

Front 50

What is the designation for a bore taper ratio of 12:1

Back 50

K

Front 51

What shield type limits the speed of the bearing

Back 51

Rubbing seal

Front 52

What are 3 bearings that handle misalignment

Back 52

Carb,

Spherical,

Self aligning

Front 53

If the bearing fit in the housing or on the shaft is incorrect but the bearing is in spec what should you do

Back 53

Replace or repair the shaft or housing

Front 54

What type of bearing has a designation starting with 7

Back 54

Single row angular contact

Front 55

What bearing has a designation of 6

Back 55

Deep groove ball bearing

Front 56

What is the extra number for in a 5 digit bearing code

Back 56

Roller width

Front 57

What is the inner bore of a bearing with the last 2 digits 02

Back 57

15mm

Front 58

What size is the bore on a bearing with the last 2 digits 03

Back 58

17mm

Front 59

What 2 bearing arrangement is the most rigid

Back 59

Back to back

Front 60

What load does the fixed bearing in a fixed/floating setup

Back 60

Axial and radial

Front 61

What supports more load plain or anti friction bearings

Back 61

Plain

Front 62

How can the loaded zone of a tapered roller bearing be increased

Back 62

Reduce the clearance

Front 63

What are 2 ways of measuring how far a bearing has been driven up a tapered adapter sleeve

Back 63

Tightening angle,

Dial indicator

Front 64

Where would you check the clearance of a double row spherical roller bearing on a bench

Back 64

The top (unloaded zone)

Front 65

What is the difference between residual and running clerance

Back 65

Running clearance is after thermal expansion from operation temperature

Front 66

If the pillow block is 43 celsius how hot are the rolling elements and inner ring?

Back 66

63 celsius rolling elements

73 celsius inner ring

Front 67

What is the difference between brinelling and false brinelling

Back 67

Brinelling is caused by you,

false brinelling is caused without you

Front 68

What are 2 ways for a machine to ingest contamination

Back 68

Faulty seals

Breather

Front 69

What are 2 sources for electric arcing in a bearing

Back 69

Poor welding procedure,

Static buildup in machine

Front 70

What are 2 main advantages of rubbing seals

Back 70

Retain oil,

Positively seals from water and fine contaminants

Front 71

What are 3 ways a lip is Helt to the shaft once installed

Back 71

Garter spring

Interference fit

Gas or liquid pressure

Front 72

What is most important when handling mechanical seals

Back 72

Keep them clean and free from damage

Front 73

Does the fixed pillow block bearing allow axial expansion

Back 73

No

Front 74

What direction should eccentric collars be installed

Back 74

Direction of shaft rotation and locked with a set screw

Front 75

Why would you use a spherical roller bearing rather than a cylindrical roller bearing

Back 75

Axial loads

Front 76

What needs to be done to a pillow block to control heavy horizontal radial loads

Back 76

Welded support blocks

Front 77

What are 2 tests that can be done to check a bearing while the machine is running

Back 77

Listen for irregular sound

Vibration analysis

Front 78

How does the area of contact affect the load bearing ability of a bearing

Back 78

Higher contact area = more rolling elements = more load

Front 79

What type of load shifts through an arc of less that 180°

Back 79

Oscillating

Front 80

Hydrostatic bearings rely on what for lubrication

Back 80

External pump

Front 81

When there is a heavy reversing load what type of bearing/lube system would be needed

Back 81

Hydrostatic

Front 82

What is crush for

Back 82

Good heat transfer

Front 83

What is another name for antirotation device

Back 83

Tang

Front 84

What are 3 methods of measuring bearing clearance

Back 84

Bump check

Plastigage

Feelers

Front 85

What is the main function of the bearing cage

Back 85

Push rolling elements through the unloaded zone

Front 86

What is the distinct feature of a maximum capacity deep groove ball bearing

Back 86

Loading slots

Front 87

What is the designation for normal clearance

Back 87

No designation

Front 88

What is the most rigid 2 bearing setup

Back 88

Back to back

Front 89

Are cylindrical roller bearings a good choice for axial float

Back 89

Yes

Front 90

What are the first number and last 2 numbers on a deep groove ball bearing with a bore of 17mm

Back 90

6 and 03

Front 91

What is the taper ratio of k

Back 91

12:1

Front 92

What is the main disadvantage of a rubbing seal

Back 92

Increased friction

Increased heat

Front 93

What type of fit does the rotating element require

Back 93

Interference fit

Front 94

Are bench and running clearance the same

Back 94

No bench is before installation and running is installed and at temperature

Front 95

What is the rule of thumb for setting clearance on a spherical roller bearing with a tapered adapter sleeve

Back 95

Final clearance is half of initial clearance