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Millwright Manual > Chapter 23 - Alignment > Flashcards

Chapter 23 - Alignment Flashcards

1
Q

Why are machines accurately aligned with each other?

A

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2
Q

How is the primary unit positioned?

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3
Q

What are the other machine units aligned with that share a common relationship to the primary unit?

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4
Q

How is an alignment procedure chosen?

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5
Q

What procedure is used to align coaxial shafts?

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6
Q

What are the results of coaxial shaft alignment?

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7
Q

What conditions of misalignment are present in misalignment coaxial shafts?

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8
Q

To successfully align inline shafts, in what two planes must these conditions be resolved?

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9
Q

Why is vertical alignment usually corrected first?

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10
Q

How are vertical misalignment and horizontal misalignment corrected?

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11
Q

Define angular misalignment

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12
Q

How is angular misalignment corrected horizontally, and vertically?

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13
Q

Define offset misalignment

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14
Q

How is offset misalignment corrected horizontally, and vertically?

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15
Q

Describe combination misalignment

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16
Q

Define softfoot

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17
Q

How does a softfoot affect the machine?

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18
Q

What causes a softfoot condition?

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19
Q

What are the two types of softfoot?

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20
Q

What is a good foot-to-base fit?

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21
Q

How does thermal expansion and contraction affect alignment?

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22
Q

What methods are used for alignment to accommodate thermal expansion and contraction?

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23
Q

What is the objective of coupling alignment?

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24
Q

How are acceptable misalignment tolerances established?

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25
Q

What factors influence which coupling alignment procedure is used?

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26
Q

List the recognized alignment methods?

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27
Q

List the tools that may be used in alignment

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28
Q

Compare made on the job shims to pre-cut shims

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29
Q

Describe the correct method for shimming a foot

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30
Q

Why are jackscrew devices recommended for alignment and what are the advantages?

A

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31
Q

When using a hydraulic jack or pry bars to shim a machine, what precautions should be taken to prevent injury?

A

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32
Q

What is known as total indicator reading (TIR)?

33
Q

How is total indicator reading TIR taken for the vertical and horizontal plane?

34
Q

How are the four readings compared to ensure accuracy of procedure and equipment?

35
Q

What two readings are required on most alignment methods?

36
Q

What precautions should be taken when handling and using a dial indicator?

37
Q

List the checks you would preform before aligning the coupling

38
Q

Describe how to detect a softfoot using both feeler gauges and dial indicator methods

39
Q

Describe the methods used to correct a softfoot condition

40
Q

Define dial indicator bracket sag

41
Q

Describe how sag is determined for a particular dial indicator set-up

42
Q

How do you correct for sag on a coupling alignment?

43
Q

Define coupling runout

44
Q

When should coupling runout be checked?

45
Q

How is coupling runout detected?

46
Q

What should be done if detected runout is greater than quality-control specifications allow in the shaft or coupling?

47
Q

List the alignment procedures that are common to all alignment situations

48
Q

With regard to rough alignment:

- what measuring tools are used?

49
Q

With regard to rough alignment:

- how is vertical angular misalignment determined?

50
Q

With regard to rough alignment:
- calculate the shin changes that would be required to correct the following vertical angular misalignment

Feeler gauge calculation 0.010” at top of coupling
D= 3”
B= 6”
A= 12”

51
Q

With regard to rough alignment:

- describe how vertical offset misalignment is corrected

52
Q

With regard to rough alignment:

- how are horizontal angular and offset misalignment corrected?

53
Q

With regard to rim and face alignment methods

- what are the advantages and limitations of rim and face alignment procedures?

54
Q

With regard to rim and face alignment methods

- describe the set-up for taking rim and face readings with a dial indicator

55
Q

With regard to rim and face alignment methods
- describe the procedure for taking rim and face measurements with a dial indicator for both vertical and horizontal alignment

56
Q

With regard to rim and face alignment methods

- describe rechecking and recording alignment

57
Q

With regard to rim and face alignment methods

- what measurements are needed to calculate shim changes?

58
Q

With regard to rim and face alignment methods
- calculate the shim changes required for the following drive unit:

Indicators zero @ 12 o’clock (fig27)
Angular TIR = 0.006”
Offset TIR = 0.010”
D = 4”
L1 = 8”
L2 = 16”
59
Q

With regard to rim and face alignment methods

- what are the consequences of the dial indicators are not set up as stated for this formula?

60
Q

With regard to rim and face alignment methods
- calculate the shim changes required for the following drive unit:

Indicators zero @ 12 o’clock (fig27)
Angular TIR = -0.015”
Offset TIR = +0.012”
D = 5”
L1 = 15”
L2 = 45”
61
Q

With regard to cross dialling

- describe three variations of cross dialling alignment methods

62
Q

With regard to cross dialling

- what are the advantages and limitations of cross dialling?

63
Q

With regard to cross dialling

- what should be done to be sure the set-up is prepared prior to cross dialling?

64
Q

With regard to cross dialling

- describe the procedure for cross dialling, reverse reading, vertical alignment

65
Q

With regard to cross dialling

- describe the procedure for cross dialling, reverse reading, horizontal alignment

66
Q

With regard to cross dialling

- how do you determine whether to insert or remove shims from your calculations?

67
Q

With regard to cross dialling
- calculate the shim changes needed for the following drive unit:

Indicators zero @ 12 o’clock
Refer to fig30 reverse reading method
D1 = +0.025”
D2 = +0.010”
A = 6.250”
B = 12.5”
C= = 37.750”
68
Q

With regard to cross dialling

- what should be done to prepare the set-up for a cross dialling, graph alignment procedure?

69
Q

With regard to cross dialling

- describe the dial indicator set-up for cross dialling, graph alignment procedure

70
Q

With regard to cross dialling

- how are dial indicator readings taken for plotting on a graph?

71
Q

With regard to cross dialling

- describe the vertical procedure that requires drawing and using a graph

72
Q

With regard to cross dialling

- describe the procedure for horizontal alignment using the cross dialling, graph alignment process

73
Q

With regard to cross dialling

- describe rechecking and recording the results

74
Q

Describe the types of lasers used for laser alignment

75
Q

What safety precautions should always be followed when using a laser?

76
Q

What procedures should be followed for laser alignment?

77
Q

What are the advantages and limitations of laser alignment?

78
Q

How is machine alignment maintained during operation?

Millwright Manual (24 decks)

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