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Millwright Block 2 > Shafts And Attachments > Flashcards

Shafts And Attachments Flashcards

1
Q

What is metalizing used for?

A

Building up worn sections of shaft

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2
Q

What is the main difference between hot rolled and cold rolled steel?

A

Surface finish and size tolerance

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3
Q

Which of these statements ave most true about square keys?

A

Sunk half their height into the shaft

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4
Q

Which is most true about pinned hubs?

A

Are often drilled on assembly

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5
Q

How would you replace a hub that is pinned with a tapered pin?

A

Step drill the hub in the drill press and final ream it on assembly

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6
Q

Which would be an advantage of standard parallel keys over tapered pins to locate a hub on a shaft?

A

Stronger and interchangeable between hubs

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7
Q

What could you do to keep2” diameter shaft from breaking where a 1” bore pulley sheave mount?

A

Turn section of the shaft down to 1.5” before it meets the 1” journal diameter

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8
Q

What method does not heat parts evenly?

A

Torch

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9
Q

What is the best tool toget in behind a hub next to a housing to removeit?

A

Bearing spitter

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10
Q

What is the most important thing to know about saddle keys?

A

’ Protects the shaft

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11
Q

What would you do if a broach did not cut a keyway full death?

A

Use a shim under the broach

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12
Q

What is Prussian blue used for?

A

Identifying contact patterns for fitting and adjusting

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13
Q

Which world be the best way to measure axial runout?

A

Measure on the face of the attachment or hub

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14
Q

What would you do if a rotor mounted on a face flange measured 0.022” of axial runout?

A

Try remounting it with attention to cleaning and torque pattern

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15
Q

Twisting forces put what sort of stress on a key?

A

Shear

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16
Q

What is meant when we say that the base is true?

A

It is flat and square

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17
Q

What is the best tool for determine radial runout?

A

Dial Indicator

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18
Q

How can a bend shaft he repaired once the high points are identified

A

Hydraulic press

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19
Q

Where should the millwright put the bearings on a shaft it he has thechoice?

A

As close to the loaded components as possible

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20
Q

What is not an advantage of shirk fits on hubs?

A

Easy to remove

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21
Q

What is a keyway that goes to the end of the shaft call?

A

Open

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22
Q

What is the thickness of d woodruff key?

A

5/16

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23
Q

What is the thickness of a keys that would be used on a 2 inch shaft

A

1/2, every inch = 1/4”

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24
Q

What are keys used for?

A

To transmit power and motion

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25
Q

Which keyseat is cut at an angle for a tapered key?

A

Hub

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26
Q

What type of setscrew has the best grip and tends to stay Tight?

A

Cup point

27
Q

Why do we chamfer the edges of parallel keys?

A

To clear radius of the keyseat corners!

28
Q

How would you check runout on a shaft?

A

Use an dial indicator while rotating shaft.

29
Q

What is the taper on an inch dimension tapered key?

A

1/8 inch foot

30
Q

What is the greatest danger when straight a shafts in a press?

A

The shaft rolling or springing away

31
Q

What does unilateral tolerance mean?

A

All tolerances for the drawing dimension is applied in one direction only

32
Q

What does bilateral tolerance mean?

A

Means that the tolerance for the drawing dimensions is applied both directions

33
Q

Radial runout?

A

Occurs when the shaft and the attachments are not concentric in their rotation

34
Q

Circular runout?

A
  • Occurs because of imperfections ( ovality, bumps, etc) in the cross section of the part
35
Q

Axial runout?

A

Occurs because attachment do not rotate perpendicularly to the shaft axis

36
Q

What is torsional shear stress?

A

Force applied to the shaft by resistance to turning that is set by the driven parts.

37
Q

What are the two main stresses?

A

Bending and torsional shear

38
Q

Why would you use hollow shafting?

A

Can reduce weight with a minimum strength reduction
Long centre distance can be spanned with less weight on each bearing.
Can conduct coolant
Can function as an output shaft for shaft- mounted reduction units.

39
Q

What does line shafting do?

A

Provides power to or timing to several drives on a single shaft.

40
Q

The steels ductility and weld ability decrease as _

A

Its carbon content increases

41
Q

What does 1020 stand for?

A

1 indicates the alloy group is carbon

#0 indicates No major alloying element besides carbon
#20 indicates 0.20% carbon content.

42
Q

What does 4340 mean?

A

4 indicates that the alloy group is molybdenum

#3 indicates that nickel and chromium are added in specific concentrations
#40 indicates 0.40% carbon content

43
Q

Numbering system , what do the 4 digits means?

A

First 2 digits indicate specific alloy groups, the last 2 digits indicate amount of carbon in the steel

44
Q

What does a clearance fit indicate?

A

Shaft is always smaller than the bore

45
Q

What does a transition fit indicate?

A

Shaft and Bose size are such that the combination of their fits give either an interference fit or a clearance fit

46
Q

What does an interference fit indicate?

A

Shaft is larger than bore of machine

47
Q

What key dosen’t require a keyseat in the shaft?

A

Saddle key

48
Q

What keys permit end movement of the two parts either in operation or during assembly?

A

Feather keys

49
Q

What is the standard taper for tapered keys?

A

1 in 96 Or 1/8 in 12 inches. (Metric is 1 in 100)

50
Q

What is an axle?

A

Rotating device on which a wheel is mounted

51
Q

What is a spindle?

A

Is a slender pin or rod which turns, or on which something else turns,

52
Q

What is a journal?

A

Part of the spindle, shaft, or axle that rotates in or on a bearing, plain friction bearing are often referred to as journal bearings

53
Q

What does hot rolled refer to?

A

Finishing process in the manufacture of the steel.

54
Q

Smooth surface finish, manufactured to close tolerances is what shafting ?

A

Finished shafting

55
Q

Where wear and corrosion are great is an example of

A

Alloy shafting

56
Q

What type of shafting is used for power transmissions?

A

Hollow shafting

57
Q

When sections of the shafting must bc turned down for a bearing or other machine components, the reductions in diameter should be no more than?

A

1.5:1

58
Q

What does critical speed depend on? (4)

A

Size of the load or loads carried by the shaft
Length of the shaft
Diameter of the shaft
The kind of support bearings

59
Q

What is critical speed?

A

Speed at which rotating shafts tends to vibrate violently in the transverse direction it the shaft rotates in the horizontal direction

60
Q

What does positive allowance refer to?

A

Minimum clearance between mating parts

61
Q

Negative allowance refers to?

A

Maximum interference

62
Q

What are the three methods of fitting?

A

Force fitting
Shrink fitting
Expansion fitting

63
Q

What is the growth formula?

A

L X (COEF) x T

Millwright Block 2 (13 decks)

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