M7.10 & M7.11 Flashcards

1
Q

What are the four types of springs?

A
  • compression
  • extension (tension)
  • torsion
  • wireform
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2
Q

What force do extension springs take?

A

Pulling forces

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3
Q

What happens if a spring is subjected to overheating?

A

It may loose characteristics and need to be replaced

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4
Q

What will corrosion on a spring cause?

A

The spring will reduce the loads it can carry

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5
Q

How are springs tested?

A

They get tested on there elasticity and compare it to graphs and figures

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6
Q

What are the types of test a spring can go through?

A
  • static extension (most common)

- load/extension

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7
Q

How does static extension testing work?

A

The manufacturer will publish exact dimensions the spring needs to be at certain resistances

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8
Q

What are bearings used for?

A

To support the journals of shafts and axles

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9
Q

What are bearings that accept forces at right-angles to the drilling axis called?

A

Journal bearings or rollor bearings

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10
Q

What are bearings that accept forces in a longitudinal direction called?

A

Pivot bearings or axial bearings

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11
Q

Why is bearing play necessary?

A

To allow space for continuous lubrication

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12
Q

What are the five types of bearings?

A
  • ball
  • needle
  • tapered roller
  • cylindrical roller
  • Spherical roller
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13
Q

What does lubrication do in a bearing?

A

Reduces friction, wear, corrosion

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14
Q

Bearings come with a preservative coating, what is important to remember about this?

A

You don’t need to clean it off before lubrication because they will be compatible

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15
Q

What will too much lubrication cause in a bearing?

A

Excessive churning and generate high temperatures

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16
Q

What is false brinelling?

A

Excessive external vibration

17
Q

What is true brinelling?

A

When loads exceed the elastic limit of the ring material

18
Q

What is fatigue failure (spalling)?

A

Fracture of the running surfaces and removal of small particles of material

19
Q

What will contamination of a bearing cause?

A

Denting of raceways or balls that lead to vibration and wear

20
Q

What is lubrication failure?

A

When the lubrication fails which will be followed by catastrophic failure

21
Q

What is misalignment of a bearing?

A

When a wear path is created due to the balls not being on the raceway

22
Q

What is caused due to loose fittings of bearings?

A

Fretting (fine metal particles which oxidise)

23
Q

What is caused due to a tight fit of bearings?

A

A deeper raceway and will increase friction and temperature

24
Q

What must you remember to do when cleaning bearings?

A

Do not touch with bare hands

25
Q

How soon after final rinse should bearings be greased?

A

Within two hours