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Millwright Block 2 > Bearings > Flashcards

Bearings Flashcards

1
Q

Why do we use bearings in machines?

A

Allows rotation while supporting the shaft

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2
Q

What effect does friction have on movement?

A

Creates resistance to motion

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3
Q

How could you check clearance on a plain split bearing?

A

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

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4
Q

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

A

A bearing puller

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5
Q

What is typical cause of Spalling?

A

 Fatigue

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6
Q

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

A

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

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7
Q

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

A

Call the shop and properly heat the bearing

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8
Q

What is the best lubricant to flush away contaminants

A

Oil

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9
Q

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

A

120° to 250 Fahrenheit

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10
Q

What is the typical cause of false brinelling

A

Vibration

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11
Q

What does a high-pitched scream indicate about the bearing

A

The clearance is too small

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12
Q

What must you ensure when electric welding near bearing?

A

Current never flows through the bearing

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13
Q

Which bearing may have a straight tapered or spherical race

A

Roller bearing

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14
Q

What is meant by built-in contamination

A

Dirt that is in induced into a machine during assembly

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15
Q

Which way do we tighten an electronic, locking collar bearing

A

Same as rotation

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16
Q

What is the best way to select the correct bearing?

A

Use the parts list provided by manufacturer

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17
Q

What is the purpose of seals on a sealed ball be

A

Keep lube in and contaminations out

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18
Q

What type of bearing would you use for heavy axial load

A

Thrust bearing

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19
Q

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

A

To ensure tight ceiling on the bore

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20
Q

What temperature does Babbitt melt at?

A

288° C, or less

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21
Q

What does a loud hollow noise indicate?

A

Too much clearance

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22
Q

What does a high pitch indicate?

A

Clearance is too small

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23
Q

What does a growling noise indicate?

A

Surfaces of the rollers and raceways are deteriorating

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24
Q

What is brinelling?

A

Its impact denting

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25
Q

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

A

About 15° above normal temp

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26
Q

How much percent of vibration does misalignment account for?

A

40%

27
Q

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

A

Becomes larger

28
Q

4 Benefits of keeping machine clean

A

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

29
Q

What does rs stand for?

A

Rubbing seal

30
Q

What is the main disadvantage of non-contact seals?

A

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

31
Q

What is axial load?

A

Side to side

32
Q

What is radial load?

A

Up and down

33
Q

What is a series 6 bearing

A

Single row deep Groove ball bearing. Pg 33 ilm

34
Q

Another word for plain linear bearings.

A

Slides or sliding - element bearings.

35
Q

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

A

360°

36
Q

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

A

Point

37
Q

When would solid bearings be used?

A

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

38
Q

When would angle bearings be used?

A

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

39
Q

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

A

Low to medium speed and for light to heavy loads.

40
Q

What is a mandrel ?

A

Dummy shaft

41
Q

What is another name for interference fit?

A

Press fit

42
Q

What are bushings?

A

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

43
Q

How is thrust controlled in a plain bearing?

A

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

44
Q

How is thrust in a shaft controlled?

A

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

45
Q

What is endfloat?

A

The amount the shaft moves axially in a bearing

46
Q

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

A

High speeds and heavy loads.

47
Q

What are the basic parts of anti- friction bearing?

A

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

48
Q

What speeds are ball bearings suited for?

A

High-speeds (40,000 rpm)

49
Q

What speeds are roller bearings applied to?

A

Low-speed application.

50
Q

How is the speed of a bearing expressed?

A

Rpm or rubbing speed.

51
Q

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

A

C1 has the smallest clearance.

52
Q

What does push fit mean?

A

Bearing was installed by hand without mechanical aid.

53
Q

What is creep in a bearing?

A

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

54
Q

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

A

Press fit

55
Q

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

A

Press fit

56
Q

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.

A

50 percent

57
Q

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

A

Ten-thousand of an inch

58
Q

What bearings are design to carry axial loads?

A

Thrust bearings

59
Q

What are two forms of lip contact seals?

A

Commercial seals
Felt seals

60
Q

Symptoms of bearing failure

A

Temperature rise
increased vibration
Unusual noise

61
Q

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

A

Less grease

62
Q

What is a #6 bearing?

A

Single-row , radial ball bearing

63
Q

What ISO bearing code represents an angular contact bearing?

A

7

Millwright Block 2 (13 decks)

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