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Millwright Block 2 (harmonized) NS > Shaft Attachments > Flashcards

Shaft Attachments Flashcards

1
Q

When using heat to apply a shrink fit hub what is most important to remember?

A

Have the means to drive and locate the hub ready

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2
Q

What check should you do if a hub does not come off when the set screws are removed?

A

Check the depth of the set screw holes to the hub thickness

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3
Q

What methods heat parts evenly?

A

Oil bath
Oven
Induction

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4
Q

What sort of tool could be used to remove a hub off a shaft that is still in the machine?

A

Puller

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5
Q

Which tool is the best tool to get behind a hub to a housing and remove it?

A

Bearing splitter

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6
Q

What can affect the performance of a properly located bearing and the machine?

A

Any geometric or dimensional inaccuracy in the shaft

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7
Q

What are the 9 most common things that influence a shafts position?

A

Straightness
Roundness
Size/fit with bearing
Bearing seat concentricity
Bearing seat squareness
Radius fillets at shoulders
Deflection of shaft
Balancing
Component for keeping bearing in position

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8
Q

What is the primary requirement for bearing shafting?

A

Proper size

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9
Q

What can happen if diameters for bearing shafting are oversized? (2)

A

Overheating
Preloading

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10
Q

What can happen if diameters for bearing shafting are undersized? (3)

A

Fretting of the shaft
Loosing of the bearing
Excessive internal clearance

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11
Q

What is a basic requirement with bearing shafts other than size?

A

Correct surface finish

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12
Q

What are the three measurements for surface finish?

A

Micrometers (um) AA
Micro-inches (uin)
Root mean square (rms)

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13
Q

What do most anti-friction bearings surface finish up to?

A

0.3 um AA (12uin)

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14
Q

What do Babbitt and bronze sleeve bearings require a finish up to?

A

0.81um AA (32uim)

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15
Q

What is the retention of a bearing on a shaft affected by? (In terms of the shaft) (4)

A

Fit
Hardness
Finish
Deflection

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16
Q

What type of fit do most anti- friction bearings have?

A

Interference fit

17
Q

What can happen if an anti friction bearing is fitted too loose?

A

Inner ring can creep on the shaft

18
Q

Where can you find the bearings fit requirements?

A

On the manufacturer tables

19
Q

What is a hub?

A

Machine element fitted to components for the purpose of enabling the component to be attached to a shaft

20
Q

How is the method to position the hub dictated? (3)

A

Fit
Type of equipment
Style of hub

21
Q

What are couplings used for?

A

To connect two shafts at their ends to transmit power

22
Q

What are the two types of couplings?

A

Rigid
Flexible

23
Q

What are rigid couplings designed for?

A

Connecting two shafts together to make a single unit

24
Q

What care should be given when using a rigid coupler in terms of the shaft?

A

Straigh
Free of rust
Free of paint
Free of dirt
Free of burrs
Free of imperfections

25
Q

In general what type of fit should a rigid coupler have with the shaft?

A

Locational interference

26
Q

What type of mounting methods does a flexible coupler use?

A

Plain taper bushings
Flanged taper bushings
Tapered shaft lock but

27
Q

What is another name for flanged taper bushings?

A

QD bushing

28
Q

What does the means used for axial location depends heavily on?

A

Whether or not axial thrust is transmitted

29
Q

How are gears attached?

A

Firstly keyed than use one of the following
Interference fit
Set screws
Tapered bushing
Locking collar and set screw
Pinning
Retaining rings
Tapered shaft with lock nut or screw
Moulding polymer

30
Q

What is moulding polymer?

A

Cast material attaching directly to a knurled shaft

31
Q

When would a feather key be used with a gear?

A

If the heat is required to slide on the shaft

32
Q

What are the 3 methods of pinning to secure gears to shafts?

A

Straight pin
Tapered pin
Spring pin

33
Q

What direction should you rotate the collar on a bearing race to tighten it?

A

Direction of shaft rotation

34
Q

What type of bushing is shown?

A

Quick detachable bushing (QD)

35
Q

What type of bushing is shown in the picture?

A

Split taper bushing

36
Q

What type of bushing is shown?

A

Taper lock bushing

37
Q

Where would you use a tapered lock sleeves?

A

On installations and assemblies for positive bearing location

Millwright Block 2 (harmonized) NS (17 decks)

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