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Machinist Period 4 2019 Cash > Bearings And Seals 150402b > Flashcards

Bearings And Seals 150402b Flashcards

1
Q

Name two general classifications of bearings

A

Plain and anti-friction

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2
Q

What type of lubrication is recommended for high-speed applications?

A

Pressurized oil

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3
Q

Bearing loads can be expressed using what terms?

A

Combination of both radial and axial

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4
Q

The numbers C1 and C5 etched on bearing race Rings indicate the …

A

Clearance between rolling elements and race

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5
Q

The bearing style that would take up the least space is the…

A

Needle roller

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6
Q

Which anti friction bearing will provide the highest axial load resistance when used in pairs?

A

Tapered roller bearing

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7
Q

If a plane bearing having a 1.5 inch outside diameter is to be installed into a housing, then the approximate hole size for an interference fit would be?

a) 1.490”
b) 1.499”
c) 1.501”
d) 1.510”

A

b) 1.499”

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8
Q

Single row angular contact ball bearings are used for…

A

Radial and axial loads

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9
Q

The best method to install a new bearing on a shaft would be to…

A

Place the bearing and heated oil prior to installation

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10
Q

The width of an O-ring Groove should be approximately…

A

150% of the O-ring width

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11
Q

What is in the alloy composition of Babbitt metal?

A

Tin, lead, antimony, copper

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12
Q

When heating a sealed anti-friction bearing with heated oil, the temperature of the oil should be no more than?

A

175 degrees Fahrenheit

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13
Q

Lip seals are used to?

A

Retain lubricant and keep out contamination

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14
Q

When discussing o-ring Theory, backup washers will …

A

Increase the pressure the O-ring can withstand

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15
Q

One critical component of Machining an O-ring Groove would be to…

A

Break the edges of the groove

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16
Q

U-cup packings are most commonly found in ______applications

A

Hydraulic

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17
Q

A double lip seal is designed to…

A

Used to control internal seepage and prevent external contamination

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18
Q

Which of the following is used for static assemblies only?

O ring
U cup
Lip seal
Gasket

A

Gasket

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19
Q

Advantages of plain bearings?

A

Require less space
Quieter than roller
Cost Less than roller
More rigid than roller

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20
Q

Disadvantages of plain bearings?

A

More friction

Constant lubrication

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21
Q

What are solid plain bearings often called?

A

Journal bearings

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22
Q

What’s materials are plain bearings made from?

A

Bronze
Sintered bronze
Plastics
Babbitt

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23
Q

Which material does not Gall or seize with journals?

A

Bronze

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24
Q

Which material is commonly called oil-lite, is porous, and can be replenished in warm oil?

A

Sintered bronze

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25
Q

Which material is corrosion-resistant, easy to machine, quiet and requires little or no lubrication?

A

Plastics

Nylon-small bearings
Teflon- very slippery, no lube
Rubber- used when water is present

26
Q

Which material can be cast in place or deposited on a stiff backing material?

A

Babbitt

27
Q

Advantages of split plain bearings?

A

Replacement without removing the shaft
Clearances adjustable by shims
Uses locking tabs or dowel pins

28
Q

Which plain bearing prevents axial movement of a shaft?

A

Plain thrust bearings

29
Q

What do anti-friction bearings rely on rather than a film of oil?

A

Precision rollers

30
Q

What are the advantages of anti-friction bearings?

A 
Friction is low
 Less axial space required
 Maintains accurate shaft alignment 
 Both radial and axial loads can be carried 
 Lubrication is simple sealed or none
31
Q

Three types of anti-friction bearings

A

Ball bearings
Roller bearings
Thrust bearings

32
Q

5 types of ball bearings

A 
Single row deep Groove 
 Double row deep Groove 
 Single row angular 
 Double row angular 
 Self-aligning internal and external
33
Q

Name the five parts of a bearing

A

The outer ring an inner ring or race
Raceways
Rolling elements
Cage or separator

34
Q

Which bearing is the most common type of bearing and is primarily for radial loads but can take moderate axial loads in either direction?

A

Single row deep Groove

35
Q

Which bearing permits a higher radial load capacity than single row,
does not handle axial loads well,
and does not tolerate any misalignment

A

Double row deep Groove

36
Q

Which bearing supports combination loads,
Must be pre-loaded in One Direction,
often used in pairs opposite each other,
and only tolerate a small amount of misalignment?

A

Single row angular contact

37
Q

Which bearing is meant for heavy radial and axial loads and can take axial loads in both directions. Tolerates no misalignment

A

Double row angular contact

38
Q

Which bearing can tolerate up to 1 and 1/2 degrees of misalignment?

A

Internal self-aligning

39
Q

Which bearing support a much higher radial load than ball bearings and has elements that are Precision ground cylinders rather than balls?

A

Roller bearings

40
Q

Which bearing is meant for very large radial loads, tolerate little or no end thrust?

A

Cylindrical roller bearing

41
Q

Which roller bearing takes both radial and axial loads and tolerates up to 2 and 1 / 2 degrees of misalignment?

A

Double row spherical

42
Q

Which roller bearing has the highest axial and thrust loading when used in pairs and is meant for large radio loads and large uni directional axial loads?

A

Tapered roller bearing

43
Q

Which roller bearing is used in pairs to accommodate reversing loads and clearances are adjusted by moving Cup and Cone axially

A

Single row tapered roller bearing

44
Q

Which roller bearing is meant for large heavy engineering applications matched to suit their function so not interchangeable?

A

Double row tapered roller bearing

45
Q

Which roller bearing takes up less space than any other anti-friction bearing and has no inner race and meant for radial loads only

A

Needle roller bearings

46
Q

Which bearing is meant primarily for thrust axial side loads and cannot take any radial load?

A

Thrust bearing

47
Q

Which bearing can take a heavy thrust load and a moderate radial load

A

Spherical and tapered roller bearing

48
Q

Which internal clearance designation provides for the largest clearance?

C1
C3
C5

A

C1

49
Q

What is the rule of thumb for interference with the housing when installing plain bearings?

A

Point 00075” to .0001 per inch of diameter

50
Q

What two material shims are used with split plain bearings

A

Stainless steel first brass otherwise

51
Q

What do you use for a housing fit check on a bearing

A

Feeler gauges

52
Q

What two things should you not do to a new bearing

A

Do not clean it and do not spin a bearing with an Air Blast

53
Q

Never heat an unsealed bearing above _____ degrees Fahrenheit. Never heat a sealed bearing above _____ degrees Fahrenheit

A

250 unsealed

175 sealed

54
Q

When seating a bearing in a housing do you direct the force against the outer or inner ring?

A

Outer ring

55
Q

Four types of seals?

A

Gaskets, O-rings, U section Rings, lip seals.

56
Q

O-rings…

A

Made of rubber like compounds
Meant to deform slightly
Nitrile, EPDM, calrez are different types

57
Q

What is the rule for o-ring depth grooves and the width of the groove?

A

Static assembly 70% of the width of the O-ring
Dynamic assemblies 80%
Which of the group should be one and a half times the width of the Ring or 150%

58
Q

When making o-ring grooves you must be sure to…

A

Break the edges of the top corners but don’t chamfer them

59
Q

What is sometimes necessary to hold a U ring in position

A

A support ring

60
Q

Which seal is designed to keep lubricant in and contamination out

A

Lip seal or double lip seal

61
Q

Types of lubrication

A

Boundary sliding surfaces contact each other

Full film sliding surfaces are separated by a pressurized film of oil

Machinist Period 4 2019 Cash (24 decks)

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