Bearings

Question 1

Why do we use bearings in machines?

Answer 1

Allows rotation while supporting the shaft

Question 2

What effect does friction have on movement?

Answer 2

Creates resistance to motion

Question 3

How could you check clearance on a plain split bearing?

Answer 3

Use a dial indicator or last word indicator on the end of the shaft

Question 4

What is the perfect tool to use when taking a worn bearing off a shaft?

Answer 4

A bearing puller

Question 5

What is typical cause of Spalling?

Answer 5

 Fatigue

Question 6

What should the oil level be on the anti-friction bearing running in an oil bath?

Answer 6

The oil should be third to halfway up the lowest rolling element

Question 7

When installing a bearing on a shaft, what is a common method used to make the process easier?

Answer 7

Call the shop and properly heat the bearing

Question 8

What is the best lubricant to flush away contaminants

Answer 8

Oil

Question 9

What is the highest temperature that a bearing shock seed for the longest duration?

Answer 9

120° to 250 Fahrenheit

Question 10

What is the typical cause of false brinelling

Answer 10

Vibration

Question 11

What does a high-pitched scream indicate about the bearing

Answer 11

The clearance is too small

Question 12

What must you ensure when electric welding near bearing?

Answer 12

Current never flows through the bearing

Question 13

Which bearing may have a straight tapered or spherical race

Answer 13

Roller bearing

Question 14

What is meant by built-in contamination

Answer 14

Dirt that is in induced into a machine during assembly

Question 15

Which way do we tighten an electronic, locking collar bearing

Answer 15

Same as rotation

Question 16

What is the best way to select the correct bearing?

Answer 16

Use the parts list provided by manufacturer

Question 17

What is the purpose of seals on a sealed ball be

Answer 17

Keep lube in and contaminations out

Question 18

What type of bearing would you use for heavy axial load

Answer 18

Thrust bearing

Question 19

Why do we have crush and spread on steel shell bearing inserts?

Answer 19

To ensure tight ceiling on the bore

Question 20

What temperature does Babbitt melt at?

Answer 20

288° C, or less

Question 21

What does a loud hollow noise indicate?

Answer 21

Too much clearance

Question 22

What does a high pitch indicate?

Answer 22

Clearance is too small

Question 23

What does a growling noise indicate?

Answer 23

Surfaces of the rollers and raceways are deteriorating

Question 24

What is brinelling?

Answer 24

Its impact denting

Question 25

What will the temperature rise to when freshly installed/lubed?

Answer 25

About 15° above normal temp

Question 26

How much percent of vibration does misalignment account for?

Answer 26

40%

Question 27

What happens to the clearance of the bearing as it wears?

Answer 27

Becomes larger

Question 28

4 Benefits of keeping machine clean

Answer 28

Allows better visual inspection Better heat dispatch Reduces chances of contamination entering bearing Protects the integrity of the machine

Question 29

What does rs stand for?

Answer 29

Rubbing seal

Question 30

What is the main disadvantage of non-contact seals?

Answer 30

Don't provide a positive sealand cannot retain oil, only grease

Question 31

What is axial load?

Answer 31

Side to side

Question 32

What is radial load?

Answer 32

Up and down

Question 33

What is a series 6 bearing

Answer 33

Single row deep Groove ball bearing. Pg 33 ilm

Question 34

Another word for plain linear bearings.

Answer 34

Slides or sliding - element bearings.

Question 35

What is the angle of loaded zone on a roller thrust bearing

Answer 35

360°

Question 36

What type of contact does a ball have with the raceway of bearing?

Answer 36

Point

Question 37

When would solid bearings be used?

Answer 37

When speed and load are low , designed to be in places where the load is applied to the top part of the bearing

Question 38

When would angle bearings be used?

Answer 38

When the load his applied parallel to, or at a slight angle to, the horizontal. When the bearing is mounted on a vertical support.

Question 39

Journal and pillow block bearings with anti-friction material liners are commonly used for ?

Answer 39

Low to medium speed and for light to heavy loads.

Question 40

What is a mandrel ?

Answer 40

Dummy shaft

Question 41

What is another name for interference fit?

Answer 41

Press fit

Question 42

What are bushings?

Answer 42

One-piece liners and can be made from any common bearing materials

Question 43

How is thrust controlled in a plain bearing?

Answer 43

By A shaft collar fastened on the shaft, or by a thrust washer backed by A sprocket or by any other hub

Question 44

How is thrust in a shaft controlled?

Answer 44

By the shaft shoulder and a collar that adjust the amount of end float

Question 45

What is endfloat?

Answer 45

The amount the shaft moves axially in a bearing

Question 46

What kind of speeds and loads should the Kingsbury thrust bearing take?

Answer 46

High speeds and heavy loads.

Question 47

What are the basic parts of anti- friction bearing?

Answer 47

Two hardened steel rings , the hardened balls or rollers and the separator.

Question 48

What speeds are ball bearings suited for?

Answer 48

High-speeds (40,000 rpm)

Question 49

What speeds are roller bearings applied to?

Answer 49

Low-speed application.

Question 50

How is the speed of a bearing expressed?

Answer 50

Rpm or rubbing speed.

Question 51

Clearance markings , C1, C2,C3,C4, C5. Which has the smallest clearance?

Answer 51

C1 has the smallest clearance.

Question 52

What does push fit mean?

Answer 52

Bearing was installed by hand without mechanical aid.

Question 53

What is creep in a bearing?

Answer 53

Is the very slow rotation of a push -fit bearing race. Creep changes The contact area on the raceway and extends the life of the bearing

Question 54

Back to back arrangements are used when the gutter ring is a blank??? Fit.

Answer 54

Press fit

Question 55

Face to face arrangements are used when the inner ring is a blank???? Fit

Answer 55

Press fit

Question 56

For standard - clearance , spherical roller bearings only, when No tables are available , a rule of thumb is to reduce the initial clearance by roughly blank??? Percent.

Answer 56

50 percent

Question 57

Another rule of thumb is to convert the last two digits of the bearing number by

Answer 57

Ten-thousand of an inch

Question 58

What bearings are design to carry axial loads?

Answer 58

Thrust bearings

Question 59

What are two forms of lip contact seals?

Answer 59

Commercial seals Felt seals

Question 60

Symptoms of bearing failure

Answer 60

Temperature rise increased vibration Unusual noise

Question 61

Rule of thumb - faster it spins , less blank??? It needs

Answer 61

Less grease

Question 62

What is a #6 bearing?

Answer 62

Single-row , radial ball bearing

Question 63

What ISO bearing code represents an angular contact bearing?

Answer 63

7