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Millwright Year 2 > Shafts and Attachments > Flashcards

Shafts and Attachments Flashcards

1
Q

What type of material is typical key-stock made from?

A

Low to medium carbon steel. Usually cold drawn.

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2
Q

What does AISI stand for and what do they do?

A

American Iron and Steel Institute. They set standards for steel manufacture.

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3
Q

What are the most common type of parallel keys?

A

Square and Rectangular.

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4
Q

Square keys are recommended up to what shaft size?

A

6 1/2 inches. For anything larger rectangular keys are recommended.

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5
Q

When would you use an Offset or Stepped key?

A

When a shaft keyway has a different width than the hub keyway.

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6
Q

What type of key requires no keyseat?

A

Saddle Key.

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7
Q

What types of keys have both ends rounded?

A
  • boxed key
  • buried key
  • Pratt and Whitney
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8
Q

What are Sunk keys?

A

They are used when access is restricted and they are set deeper into the shaft.

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9
Q

What are Feather keys?

A

They permit end movement of two parts either in operation or assembly.

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10
Q

What are the two types of Feather keys?

A

Fixed and Sliding.

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11
Q

What are the two types of Tapered keys?

A

Plain and Gib-Headed.

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12
Q

What is the taper on a Tapered key?

A

1/8” per foot or 1 : 96 ratio.

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13
Q

Keyseats cut at the end of a shaft are called _________.

A

Open Keyseat.

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14
Q

Keyseats cut into the middle of a shaft are called __________.

A

Boxed Keyseat.

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15
Q

What type of keyseat does an end mill produce?

A

Profile Keyseat.

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16
Q

What type of keyseat does a horizontal milling cutter produce?

A

Sled Runner or Runout Keyseat.

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17
Q

How is the proper depth of a keyseat in a shaft measured?

A

From the bottom of the keyseat to the opposite side of the shaft.

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18
Q

What are the 3 fits that a key has in relation to the shaft and hub?

A

Class 1 - Clearance fit.
Class 2 - Relatively tight fit.
Class 3 - Interference fit.

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19
Q

What should be done with a key before driving it into the keyseat to prevent damage or seizing?

A

Lightly lubricate with oil or an anti-seize agent.

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20
Q

How would you decide what size set screw to use for a key?

A

The set screw should be 75% of the width of the key.

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21
Q

What are the six types of set screws?

A

-cup, flat, cone, oval, half-dog, full-dog

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22
Q

Are set screws considered a compression fastener?

A

Yes.

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23
Q

What would be used to lock set a set screw in place in high vibration areas?

A

Socket Locking Screw.

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24
Q

Wherever possible, what tool would you use to remove a gib-headed key?

A

Fox Wedge.

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25
Q

What is a Shaft?

A

The component of all mechanical devices that transmits motion and power.

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26
Q

What is an Axle?

A

Rotating device on which a wheel is mounted.

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27
Q

What is a Spindle?

A

A slender pin or rod which turns, or on which something else turns.

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28
Q

What is a Journal?

A

The part of the spindle, shaft or axle that rotates in or on a bearing.

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29
Q

When is alloy shafting used?

A

When wear and corrosion are involved.

30
Q

When is hollow shafting used?

A

When weight is an issue.

31
Q

What is the best way to identify shafting materials?

A

The numbers stamped into the steel.

32
Q

What is the definition of stress?

A

The internal resistance offered by a unit area of a material to an externally applied load.

33
Q

What stress tends to stretch or lengthen a shaft?

A

Tensile Stress.

34
Q

What stress tends to compress or shorten a shaft?

A

Compressive Stress.

35
Q

What is Bending stress?

A

A combination of Tensile and Compressive stress.

36
Q

What is Shear stress?

A

When the applied force tends to cut through the shaft.

37
Q

What is Torsional shear stress?

A

When torque is applied it causes torsional deformation along the length of the shaft.

38
Q

What is Fatigue Strength?

A

The ability of a shaft to resist fatigue.

39
Q

What is Fatigue loading?

A

When the shaft is subject to many cycles of loading.

40
Q

Which type of keyseat has the least stress concentration factor?

A

Runout.

41
Q

When placing a bearing what consideration should be taken?

A

The bearing should be placed as close to the loaded component as possible.

42
Q

Should the fillet radius on the shaft be smaller or larger than the inner ring radius of the bearing to be mounted?

A

Smaller.

43
Q

What should be utilized when using a puller on the end of a shaft?

A

Shaft Center Protector.

44
Q

What is Runout?

A

Any deviation from true.

45
Q

What is Radial Runout?

A

Shaft deflection.

46
Q

What is Circular Runout?

A

Imperfections on the outside surface.

47
Q

What is Axial Runout?

A

Movement of the shaft perpendicular to the shafts axis.

48
Q

What is a Coupling?

A

Couplings are use to join two ends of a shaft together.

49
Q

Name the two types of couplings?

A

Rigid and Flexible.

50
Q

What does a Straight Pin, Tapered Pin and Spring Pin all have in common?

A

They are all interference fit.

51
Q

What does Positive Allowance refer to?

A

Minimum allowance between parts.

52
Q

What does Negative Allowance refer to?

A

Maximum clearance.

53
Q

What are the 5 classes of fit?

A
  • running and sliding clearance fit
  • locational clearance fit
  • transition fit
  • locational interference fit
  • force or shrink fit
54
Q

What is tolerance?

A

It is the maximum and minimum limits of size.

55
Q

What is the basic hole system?

A

In this system the design size of the hole is the basic size. (change the shaft size)

56
Q

What is the basic shaft system?

A

In this system the design size of the shaft is the basic size. (change the bore)

57
Q

What is Unilateral Tolerance?

A

Tolerance for the drawing dimension is applied in one direction only.

58
Q

What is Bilateral Tolerance?

A

Tolerance for the drawing dimension is applied in both directions.

59
Q

What unit of measurement is used when measuring shafts?

A

1/16 of an inch.

60
Q

What does µm mean?

A

Millionth of a meter.

61
Q

What does µin mean?

A

Millionth of an inch.

62
Q

What is the meaning of Fit?

A

The range of tightness or looseness between mating parts.

63
Q

What is the recommended width of a key relative to the shaft diameter?

A

Approximately 1/4 the width of the shaft.

64
Q

What should remain between a tapered gib head and a hub?

A

A gap for extraction purposes.

65
Q

What do Splines allow for between the component and the shaft?

A

High torque transfer.

66
Q

Which way do you rotate the eccentric locking collar before tightening the set screws?

A

In the direction of shaft rotation.

67
Q

What is the recommended maximum distance between bearings on a standard line shaft?

A

8 feet.

68
Q

What is the purpose of a floating bearing on a line shaft?

A

To accommodate for shaft expansion.

69
Q

Where should the fixed bearing be placed on a line shaft?

A

Close to the main drive sprocket, pulley or gear.

70
Q

How do you minimize bending stress?

A

Keep loads close to bearings.

71
Q

What is added to steel to improve machinability?

A

Lead.

72
Q

What is the taper on a Tapered Dowel Pin?

A

1/4 inch per foot or a 1 : 48 ratio.

Millwright Year 2 (7 decks)

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