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Millwright Level 2 > Shafts and Attachments > Flashcards

Shafts and Attachments Flashcards

1
Q

These transmit motion and power from one machine to another

A

Shafts

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2
Q

These are used to locate parts precisely

A

Keys and keyseats

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3
Q

Axial grooves manufactured into attachments and shafts are known as

A

Splines

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4
Q

Key stock is manufactured to this tolerance

A

A plus tolerance (oversize)

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5
Q

Key-stock material

A

low to medium carbon steel (AISI 1020 cold drawn)

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6
Q

Bar stock is made to this tolerance

A

A minus tolerance
Sizes up to 0.75” -0.002
Sizes 0.75 to 1.5” -0.003

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7
Q

Rectangular keys are also known as

A

Flat keys

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8
Q

Square keys are recommended for shaft sizes up to

A

165mm (6.5”)

Rectangular is recommended for larger sizes

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9
Q

This key is used when the shaft keyseat is a different size than the hub keyseat, and also align machine parts

A

Offset key (stepped key)

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10
Q

This key does not require a keyseat in the shaft, uses friction from the set screws upon it

A

Saddle key

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11
Q

This key is equal length to the keyseat, and less than the width of the hub

A

Boxed (blind) keys ex. Buried, Pratt and Whitney

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12
Q

Similar to boxed keys, but are 2/3 in the shaft, 1/3 in the hub (also sizes they come in)

A

Sunk keys (sizes from No 1. 1/2” long by 1/16” wide to No 34. 3” long by 5/8” wide

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13
Q

This key has a tight fit in the keyseat, sometimes secured by screws and allows some axial movement of the hub

A

Fixed feather

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14
Q

This key slides in a keyseat with the part along the shaft, prevents the rotation of one part on the other

A

Sliding feather

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15
Q

This key secures the component firmly to the shaft with no set screw

A

Tapered key

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16
Q

The standard taper for tapered keys

A

1 in 96 or 1/8” in 12”

Metric ratio is 1 in 100

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17
Q

Woodruff keys with a diameter larger than ___ may have their ends flattened

A

1.5”

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18
Q

The last two digits in a woodruff key give this

A

Nominal diameter in eighths of an inch

ex. #406 = 06x1/8 = 3/4

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19
Q

The digit(s) before the last two digits in a woodruff key give this

A

Width of key in thirty-secondths of an inch

ex. #406 = 4x1/32 = 1/8

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20
Q

The width of the key is ___ ______ the nominal diameter of the shaft

A

one quarter

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21
Q

How do you find the key length

A

Same as the shaft diameter

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22
Q

End mills produce this keyseat

A

Profile

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23
Q

Horizontal milling cutters produce this kind of keyseat

A

Sled runner or runout

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24
Q

Keyseat alignment has these maximum tolerances

A
  1. 25mm (0.010”) for offset alignment.

0. 10mm (0.002”) in a distance of 100mm (4”) for angular misalignment

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25
Q

How is the depth of a keyseat measured

A

Diametrically from the bottom of the keyseat to the opposite side of the shaft

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26
Q

How are parallel keyseats cut in bores

A

Enough to accommodate half the height of the key plus clearance

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27
Q

End mills used to cut keys are called this

A

Slot cutters

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28
Q

What tolerance do end mills have on the diameter

A

+0.0000 to -0.0015

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29
Q

What is the method for cutting key seats in attachments

A

Hand-broaching

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30
Q

How much does each tooth protrude on a broach

A

0.003” (0.07mm) further than the preceding tooth (last 3 are the same)
Each pass cuts to a depth of 1/16”

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31
Q

Keyway broaches are furnished with this amount of rake

A

8 to 10 degrees

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32
Q

What are the classes of fit for keys

A

Class 1 is a clearance fit
Class 2 is a relatively tight fit
Class 3 is an interference fit

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33
Q

What are the clearances for the key in a keyseat

A

0.005” above, 0.002” on the sides

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34
Q

When should adhesives not be used for keys

A

Temperatures above 93 C

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35
Q

How are set screws categorized

A

By the style of their heads (forms) and their points

36
Q

Set screw head styles

A

Hex socket, slotted socket, flat socket, square head (protrude from component)

37
Q

The most common set screw head used

A

Flush hex head

38
Q

Set screw used to lock pulleys, sheaves, gears, collars directly onto soft shafts

A

Cup point

Knurled cup for vibration and permanent position

39
Q

Set screw used to secure stops, screws, gears to hardened shafts

A

Flat point

40
Q

Set screw used where it is spot drilled first

A

Cone point

41
Q

Set screw used to lock parts that are adjusted frequently relative to each other

A

Oval point

42
Q

Set screw used to engage directly into slots milled longitudinally in shafts, also acts as stop to limit travel

A

Half-dog

43
Q

Are set screws compression or tension

A

Compression

44
Q

When more than one set screw is required where are they placed?

A

90 degrees to each other

45
Q

What is the size of socket locking screws

A

Length is one half their diameter

46
Q

What do you use to remove gib-headed keys

A

Fox wedge between gib and face of hub (may need more than one)

47
Q

What is one way to remove a parallel key if theres room in the keyseat

A

a dutchman

48
Q

What is the process of removing scale off the hot-rolled shafting

A

pickling and bright dipping

49
Q

This is known is precision shafting

A

C1045/C1050 (high speed applications)

50
Q

What weight and strength loss in a hollow shaft

A

Lose 25% of it’s weight but only 6.25% of it’s strength

51
Q

This is defined at the internal resistance offered by a unit area of a material to an externally applied load

A

Stress

52
Q

Normal stresses are either these two things

A

Tensile or compressive

53
Q

A combination of tensile and compressive stresses

A

Bending stress

54
Q

Occurs when the applied force tends to cut through the shaft

A

Shear stress

55
Q

Which keyseat has less stress concentrations, profile or runout

A

Runout because of it’s smooth longitudinal radius at the ends

56
Q

The reduction in diameter on a shaft for a shoulder should be no more than this

A

1.5:1

Fillet radius large as possible

57
Q

Machines are usually not set within __% of their critical speed

A

20%

58
Q

This runout occurs when the shaft and the attachments are not concentric in their rotation

A

Radial

59
Q

This runout occurs because of imperfections in the corss section of the part

A

Circular

60
Q

This runout occurs because attachments do not rotate perpendicularly to the shaft axis

A

Axial

61
Q

Styles of hubs (bosses)

A

A - No shoulders
B - Shoulder on one side
C - Both sides
D - Split sprocket

62
Q

The two types of couplings

A

Rigid and flexible

63
Q

For a manual puller the diameter of the adjusting screw should be at least this large

A

At least half as large as the shaft

64
Q

Two helical gears in mesh and rotating under toque produce this

A

Thrust

65
Q

Tapered bushing recognized by an axial split through the barrel and flange

A

Quick detachable bushings

66
Q

Tapered bushing that has an axial split through the barrel and is internally and externally keyed

A

Split taper bushing

67
Q

The taper on a dowel pin

A

1/4” per foot

68
Q

This shafting is not good for shock load applications

A

Hollow

69
Q

The maximum distance between bearings on a standard line shaft

A

8 feet

70
Q

Define RC, LC, LT, LN, and FN fits

A 
RC - Running and sliding fit
LC - Clearance
LT - Same size
LN - Press fit
FN - Shrink fit
71
Q

On end mills a split collar is required to accept shanks with a diameter smaller than

A

1/4”

72
Q

This process is the technique of spraying a metal coating onto a metal object

A

Metalizing

73
Q

This refers to the minimum clearance between mating parts

A

Positive allowance

74
Q

This refers to the maximum interference

A

Negative allowance

75
Q

This clearance provides clearance between mating parts for lubrication

A

Running and sliding

76
Q

A machine screw fit into a bolting hole is an example of this fit

A

Locational clearance

77
Q

A dowel pin in a mating hole is an example of this type of fit

A

Transition fit

78
Q

An anti-friction bearing being pressed into a housing is an example of this fit

A

Locational interference

79
Q

The range in size of hydraulic presses

A

10 tons to 150 tons

80
Q

A puller needs to withstand this force in tons

A

7 to 10 times the shaft diameter in inches

81
Q

How far should the gib head be from the front of the hub

A

6mm (1/4”)

82
Q

Precision shafting over this size is supplied in fibre tubes

A

1-1/4”

83
Q

Most anti-friction bearings require a shaft surface finish up to

A

0.30 um

84
Q

Babbitt and bronze sleeve bearings require a surface finish of up to

A

0.81 um

85
Q

This is used to adjust the clearance between mating parts

A

A gib

86
Q

Type of key used for reverse torque

A

Kennedy

Millwright Level 2 (10 decks)

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