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Industrial Mechanic 2nd Block, Harmonized > Alb Mod Anti friction B > Flashcards

Alb Mod Anti friction B Flashcards

1
Q

Proper preparation is essential to ensuring: (2)

A
  • Efficient installation

- Damage-free installation

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2
Q

Regardless of the installation method you choose, what four things should be done? (4)

A
  • Clean the machine and bearing assembly
  • Inspect for damage. If damaged, why?
  • Do a final cleanup of assembly area
  • Organize tools and ensure they’re clean
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3
Q

A solvent bath for general use should be used for the initial cleanup, but for the final cleaning:

A

A clean bath of solvent should be used

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4
Q

While cleaning the machine, pay attention to the inside of the bearing housing. It is critical to the life of the bearing that ____ are flushed and wiped from the cavity

A

all abrasive particles

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5
Q

During cleanup on the shaft, it is critical that you keep _____ off the bearing seats, as you don’t want to alter the diameter

A

abrasives

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6
Q

During inspection of the housing, look for: (2)

A
  • Cracks, nicks, burrs, corrosive damage that affects fit

- Grooves or marks from the outer ring spinning

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7
Q

If the bore of a housing is damaged, it must be:

A

Sleeved or discarded

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8
Q

When checking a shaft for damage, pay attention to: (3)

A
  • Straightness
  • Keyway and hub mounting surface
  • Seal and bearing seats
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9
Q

When inspecting bearings, pay attention to:

A

Condition of rings (cracks, corrosion, discoloration or tracks from electric arching)

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10
Q

The area you assemble bearings/shafts/housings should be away from: (4)

A
  • Grinding
  • Welding
  • Filing
  • Machining
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11
Q

Although hot mounting can be accomplished on all sizes of bearings, it is most practical on bore sizes over:

A

20 mm

When cold mounting methods are not practical

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12
Q

When a bearing must be hot mounted on a shaft and installed in a housing at the same time, the housing must be:

A

Heated while the bearing is heated

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13
Q

The heating method you choose depends mainly on (2)

A
  • Size of the bearing

- available equipment

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14
Q

Never heat a bearing above:

A

120°C or 250°F

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15
Q

Never heat a sealed bearing above:

A

80°C or 175°F

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16
Q

If you use an oil bath, what two things should you ensure? (2)

A
  • Use new, clean, high temperature oil

- Do not place the bearing directly on the bottom of the oil bath

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17
Q

When mounting cylindrical bore bearings, ensure there is no gap between the bearing and the shoulder with:

A

0.0001” feeler

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18
Q

The process for hot mounting a bearing on a tapered sleeve is the same as for cold mounting, however:

A

No force is required to move the bearing up the taper

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19
Q

How would you ensure proper internal clearance when hot mounting a tapered bore bearing?

A
  • When cold, firmly seat bearing on taper.
  • Measure distance to shoulder
  • Look up axial drive distance, subtract from distance to shoulder
  • Mark position on shaft
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20
Q

When cold mounting, ensure the bearing ring with the clearance fit is the:

A

Bearing with the stationary load

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21
Q

You should cold mount bearings with bores ___” or less only

A

1.5”

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22
Q

You can cold mount a tapered bore bearing under 4” with a locknut. Over this size, you should use:

A

Hydraulic nut, or a nut equipped with jacking bolts

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23
Q

When mounting a bearing, always push on the:

A

Ring or rings being fitted

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24
Q

The most practical method for mounting a small cylindrical bore bearing is the:

A

Drive method

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25
Q

Needle bearings with a very thin wall on its cup should be installed with a mandrel to avoid:

A

crushing or distorting the bearing

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26
Q

A small cup can be installed with a press when convenient, however it may be more practical to use a:

A

Hammer and madnrel

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27
Q

To check if a cup has been installed properly, check that there is no gap between the cup and the shoulder with a:

A

0.0001” feeler

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28
Q

To prevent spinning or moving of the inner race, use a tapered adapter sleeve. When mounting a bearing on one, you are setting: (2)

A
  • Internal clearance

- Axial position

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29
Q

Any sign of a groove or ridge on a tapered sleeve indicates a:

A

worn taper

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30
Q

On a tapered bore bearing, seat it upon the sleeve without the tab washer first. This is to:

A

prevent the tab from shearing off as it’s tightened

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31
Q

The tab on a tab washer that locks the nut receives virtually no force, it simply:

A

Prevents the nut from vibrating loose

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32
Q

The internal clearance on a bearing is the:

A

total clearance between the rolling elements and raceway, when one ring is pushed as far from the other as possible

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33
Q

When you use a dial indicator to check the distance one ring can be moved with respect to the other ring, you are doing what kind of check?

A

lift check.

This is only an approximate check

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34
Q

On roller bearings, the internal clearance can be measured with a _____ between the unloaded rolling element and the raceway

A

Feeler

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35
Q

Internal axial clearance is the:

A

Clearance between the rolling elements and race way when one ring is moved away from the other in an axial direction

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36
Q

internal radial clearance is the:

A

Clearance between the rolling elements and the raceway when one ring is moved away from the other in a radial direction

37
Q

Initial clearance is the clearance in a bearing:

A

before it is mounted

38
Q

Residual clearance is the clearance in a bearing:

A

after is has been mounted

39
Q

Running clearance is the clearance in a bearing:

A

When it is running and at temperature

40
Q

Preload is the:

A

load the rolling elements are under before any external load is applied

41
Q

Preload is normally a ____ load on the rolling elements

A

axial

42
Q

Preload is set by using:

A

Spacers or shims

43
Q

Preload is also affected by the: (2)

A

Shaft and housing fits

44
Q

The three ISO classes of preload are: (3)

A

Lighter
Normal
Heavier

45
Q

Are preload designations standardized?

A

No

46
Q

Preload is applied when: (2)

A
  • The operating load is too light to make the rolling elements roll properly
  • To reduce shaft deflection, make a stiffer assembly
47
Q

What two things determine how much the initial clearance is reduced when installing a bearing? (2)

A
  • tightness on shaft

- housing fit

48
Q

The clearance in a spherical roller bearing is commonly checked with:

A

Feeler

49
Q

Bearing clearance is set on a tapered bore bearing by forcing the bearing up the taper a predetermined distance. How can this distance be found?

A

Bearing tables

50
Q

The two standard tapers for tapered bearing sleeves are: (2)

A

1:12(K) 1:30(K30)

51
Q

The two methods for checking how far a bearing needs to be pushed up a taper is to use: (2)

A
  • Tightening angle

- Dial indicator

52
Q

With a tapered bore bearing, the 3 methods for setting the starting point from which the drive up is measured is to: (3)

A
  • Seat firmly by hand
  • Check clearance with feeler
  • Use a pressure gauge and hydraulic nut
53
Q

The tightening angle is useful for setting bearings that are:

A

Difficult to check with a feeler gauge

54
Q

The tightening method isn’t considered accurate because:

A

The starting point for drive up can vary

55
Q

For spherical roller bearings, you need to calculate the tightening angle based on how far the nut advances in one turn. This is based on the knowledge that a _____” advance axially reduces the radial clearance by 0.001” for a 1:12 taper

A

0.015

56
Q

A _____ can be set against the inner ring so you can watch the amount of drive up as you install the bearing

A

dial indicator

57
Q

When using a dial indicator with the drive up method of setting clearance on a tapered sleeve, what method would you use for finding your start point?

A
  • measure initial internal clearance, with feeler gauge, after bearing is resting loose on the sleeve
  • Begin driving the bearing up until you feel the feeler gauge pinched by the roller
58
Q

The most accurate method for setting residual clearance is to use: (2)

A

Hydraulic pressure and dial indicator

59
Q

The procedure for setting the starting point with hydraulic pressure is to:

A

pump hydraulic nut until starting pressure is indicated, zero dial, pump until dial indicator indicates proper axial drive up

60
Q

When setting the internal clearance on a self aligning ball bearing, a rule of thumb is that the correct clearance is indicated by:

A

Slight drag when the outer ring is swiveled (for normal initial clearance only)

Note: It takes only a little force to arrive at the proper tightness according to the tightening angle.

61
Q

Non destructive removal methods are used so the bearing can be reused. In preparation for removal, you should:

A

Remove any deposits or burrs from the shaft

62
Q

List the non destructive removal methods: (6)

A
  • Cooling
  • Heating
  • Oil injection
  • Hydraulics
  • Arbor press
  • Drive
63
Q

When cooling a shaft to remove a bearing, a _____ should be applied to the bearing to remove it before it begins to shrink with the shaft

A

steady pull

64
Q

When using coolant, be cautious not to apply any to the part you are applying force to, because:

A

The coolant will make parts brittle

65
Q

When heating a bearing, avoid the use of flame directly on the bearing. Why?

A

Could cause uneven heating and warping, as well as oxidization of rollers and raceways

66
Q

This tool used to remove bearings is limited to cylindrical bearings with separable roller and cage assemblies

A

heating ring

67
Q

Oil injection as a bearing removal method requires:

A

The shaft to be pre drilled

68
Q

When removing a bearing with the oil injection method, the film of oil ensure what happens to the bearing and shaft during removal?

A

No abrasion damage

69
Q

What is required when removing a bearing with the oil injection method on a cylindrical bearing and not a tapered bearing?

A

Pullers

70
Q

What should you do when you remove a tapered bearing with the oil injection method?

A

Leave the retaining nut close to the bearing to ensure the bearing isn’t ejected at high speed

71
Q

The hydraulic methods of non-destructive removal of a bearing include: (3)

A
  • Hydraulic nut
  • Hydraulic jack
  • Hydraulic Press
72
Q

A hydraulic nut can be used to remove a bearing from a tapered removal sleeve, however, if the bearing has a cylindrical seat, a ____ or a ____ is required for hydraulic removal

A

Hydraulic press or hydraulic ram

73
Q

What hydraulic method could you use to non-destructively remove a bearing that is still on a machine?

A

Pull it with a hydraulic jack

74
Q

When pulling a bearing off a shaft with a hydraulic jack, if at all possible, use a _____ behind the bearing

A

Bearing splitter

75
Q

When using a jack to remove a bearing from a shaft, if the end of the shaft is threaded, use _____ to protect it

A

a smooth soft piece of metal

76
Q

When using a hydraulic ram to remove a bearing, be aware of these two dangers: (2)

A
  • The bearing may explode under pressure
  • The tie rods connected to the strong back may spread and cause the ram to fly out

Note: you can help prevent this by ensuring the ram is centered on the shaft, the base of the ram is square on the strong back, and that you have a drilled piece of flat bar holding the tie rods from spreading

77
Q

The type of puller you use depends on: (2)

A
  • The type of bearing

- How it is mounted

78
Q

The most secure and effective puller is the:

A

Bearing splitter

79
Q

When there is not enough room for a splitter, what kind of puller can be used instead?

A

2, 3 or 4 jaw puller

80
Q

Pulling on the outer ring should not be done on larger bearings, but it can be done to bearings under ____ inches by rotating the bearing/jaws as you apply pressure to the puller

A

4”

81
Q

When using a puller, ensure you’re protecting the shaft ____

A

center

82
Q

Never pull on the outer ring of a self aligning ball bearing, it may:

A

Explode under tension

83
Q

List the destructive bearing removal methods: (5)

A
  • Grinder
  • Torch
  • Drive
  • Weld
  • Pullers
84
Q

When cutting a bearing inner ring off with a grinder, what steps should you take?

A

Cut the inner ring, not quite to the shaft, in two places 180° from each other. Finish cutting with a blow from a hammer and chisel

85
Q

When cutting a bearing off with a torch, be sure to not direct the heat towards the shaft. This can:

A

bent the shaft

86
Q

Driving a bearing off with a hammer and chisel is not usually successful on a shaft diameter over:

A

2 inches

87
Q

To remove an outer ring from a bore with a welder, what would you do?

A

Weld in a zig zag pattern around the race. When cooled, it will shrink the race.

88
Q

What kind of puller could you use to destructively remove a bearing?

A

4 jaw internal puller

Note: jaws are inserted between rolling elements and come with a wide variety of jaw styles

89
Q

The collet style puller is fast and convenient, but causes:

A

Impact damage to ball bearings

Industrial Mechanic 2nd Block, Harmonized (28 decks)

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