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Millwright Level 2 > Shafts and Attachments > Flashcards

Shafts and Attachments Flashcards

(86 cards)

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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
How is the depth of a keyseat measured
Diametrically from the bottom of the keyseat to the opposite side of the shaft
26
How are parallel keyseats cut in bores
Enough to accommodate half the height of the key plus clearance
27
End mills used to cut keys are called this
Slot cutters
28
What tolerance do end mills have on the diameter
+0.0000 to -0.0015
29
What is the method for cutting key seats in attachments
Hand-broaching
30
How much does each tooth protrude on a broach
0.003" (0.07mm) further than the preceding tooth (last 3 are the same) Each pass cuts to a depth of 1/16"
31
Keyway broaches are furnished with this amount of rake
8 to 10 degrees
32
What are the classes of fit for keys
Class 1 is a clearance fit Class 2 is a relatively tight fit Class 3 is an interference fit
33
What are the clearances for the key in a keyseat
0.005" above, 0.002" on the sides
34
When should adhesives not be used for keys
Temperatures above 93 C
35
How are set screws categorized
By the style of their heads (forms) and their points
36
Set screw head styles
Hex socket, slotted socket, flat socket, square head (protrude from component)
37
The most common set screw head used
Flush hex head
38
Set screw used to lock pulleys, sheaves, gears, collars directly onto soft shafts
Cup point | Knurled cup for vibration and permanent position
39
Set screw used to secure stops, screws, gears to hardened shafts
Flat point
40
Set screw used where it is spot drilled first
Cone point
41
Set screw used to lock parts that are adjusted frequently relative to each other
Oval point
42
Set screw used to engage directly into slots milled longitudinally in shafts, also acts as stop to limit travel
Half-dog
43
Are set screws compression or tension
Compression
44
When more than one set screw is required where are they placed?
90 degrees to each other
45
What is the size of socket locking screws
Length is one half their diameter
46
What do you use to remove gib-headed keys
Fox wedge between gib and face of hub (may need more than one)
47
What is one way to remove a parallel key if theres room in the keyseat
a dutchman
48
What is the process of removing scale off the hot-rolled shafting
pickling and bright dipping
49
This is known is precision shafting
C1045/C1050 (high speed applications)
50
What weight and strength loss in a hollow shaft
Lose 25% of it's weight but only 6.25% of it's strength
51
This is defined at the internal resistance offered by a unit area of a material to an externally applied load
Stress
52
Normal stresses are either these two things
Tensile or compressive
53
A combination of tensile and compressive stresses
Bending stress
54
Occurs when the applied force tends to cut through the shaft
Shear stress
55
Which keyseat has less stress concentrations, profile or runout
Runout because of it's smooth longitudinal radius at the ends
56
The reduction in diameter on a shaft for a shoulder should be no more than this
1.5:1 | Fillet radius large as possible
57
Machines are usually not set within __% of their critical speed
20%
58
This runout occurs when the shaft and the attachments are not concentric in their rotation
Radial
59
This runout occurs because of imperfections in the corss section of the part
Circular
60
This runout occurs because attachments do not rotate perpendicularly to the shaft axis
Axial
61
Styles of hubs (bosses)
A - No shoulders B - Shoulder on one side C - Both sides D - Split sprocket
62
The two types of couplings
Rigid and flexible
63
For a manual puller the diameter of the adjusting screw should be at least this large
At least half as large as the shaft
64
Two helical gears in mesh and rotating under toque produce this
Thrust
65
Tapered bushing recognized by an axial split through the barrel and flange
Quick detachable bushings
66
Tapered bushing that has an axial split through the barrel and is internally and externally keyed
Split taper bushing
67
The taper on a dowel pin
1/4" per foot
68
This shafting is not good for shock load applications
Hollow
69
The maximum distance between bearings on a standard line shaft
8 feet
70
Define RC, LC, LT, LN, and FN fits
``` RC - Running and sliding fit LC - Clearance LT - Same size LN - Press fit FN - Shrink fit ```
71
On end mills a split collar is required to accept shanks with a diameter smaller than
1/4"
72
This process is the technique of spraying a metal coating onto a metal object
Metalizing
73
This refers to the minimum clearance between mating parts
Positive allowance
74
This refers to the maximum interference
Negative allowance
75
This clearance provides clearance between mating parts for lubrication
Running and sliding
76
A machine screw fit into a bolting hole is an example of this fit
Locational clearance
77
A dowel pin in a mating hole is an example of this type of fit
Transition fit
78
An anti-friction bearing being pressed into a housing is an example of this fit
Locational interference
79
The range in size of hydraulic presses
10 tons to 150 tons
80
A puller needs to withstand this force in tons
7 to 10 times the shaft diameter in inches
81
How far should the gib head be from the front of the hub
6mm (1/4")
82
Precision shafting over this size is supplied in fibre tubes
1-1/4"
83
Most anti-friction bearings require a shaft surface finish up to
0.30 um
84
Babbitt and bronze sleeve bearings require a surface finish of up to
0.81 um
85
This is used to adjust the clearance between mating parts
A gib
86
Type of key used for reverse torque
Kennedy

Millwright Level 2 (10 decks)

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