Shafts And Attachments

Question 1

What is metalizing used for?

Answer 1

Building up worn sections of shaft

Question 2

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

Answer 2

Surface finish and size tolerance

Question 3

Which of these statements ave most true about square keys?

Answer 3

Sunk half their height into the shaft

Question 4

Which is most true about pinned hubs?

Answer 4

Are often drilled on assembly

Question 5

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

Answer 5

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

Question 6

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

Answer 6

Stronger and interchangeable between hubs

Question 7

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

Answer 7

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

Question 8

What method does not heat parts evenly?

Answer 8

Torch

Question 9

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

Answer 9

Bearing spitter

Question 10

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

Answer 10

’ Protects the shaft

Question 11

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

Answer 11

Use a shim under the broach

Question 12

What is Prussian blue used for?

Answer 12

Identifying contact patterns for fitting and adjusting

Question 13

Which world be the best way to measure axial runout?

Answer 13

Measure on the face of the attachment or hub

Question 14

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

Answer 14

Try remounting it with attention to cleaning and torque pattern

Question 15

Twisting forces put what sort of stress on a key?

Answer 15

Shear

Question 16

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

Answer 16

It is flat and square

Question 17

What is the best tool for determine radial runout?

Answer 17

Dial Indicator

Question 18

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

Answer 18

Hydraulic press

Question 19

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

Answer 19

As close to the loaded components as possible

Question 20

What is not an advantage of shirk fits on hubs?

Answer 20

Easy to remove

Question 21

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

Answer 21

Open

Question 22

What is the thickness of d woodruff key?

Answer 22

5/16

Question 23

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

Answer 23

1/2, every inch = 1/4”

Question 24

What are keys used for?

Answer 24

To transmit power and motion

Question 25

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

Answer 25

Hub

Question 26

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

Answer 26

Cup point

Question 27

Why do we chamfer the edges of parallel keys?

Answer 27

To clear radius of the keyseat corners!

Question 28

How would you check runout on a shaft?

Answer 28

Use an dial indicator while rotating shaft.

Question 29

What is the taper on an inch dimension tapered key?

Answer 29

1/8 inch foot

Question 30

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

Answer 30

The shaft rolling or springing away

Question 31

What does unilateral tolerance mean?

Answer 31

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

Question 32

What does bilateral tolerance mean?

Answer 32

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

Question 33

Radial runout?

Answer 33

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

Question 34

Circular runout?

Answer 34

- Occurs because of imperfections ( ovality, bumps, etc) in the cross section of the part

Question 35

Axial runout?

Answer 35

Occurs because attachment do not rotate perpendicularly to the shaft axis

Question 36

What is torsional shear stress?

Answer 36

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

Question 37

What are the two main stresses?

Answer 37

Bending and torsional shear

Question 38

Why would you use hollow shafting?

Answer 38

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.

Question 39

What does line shafting do?

Answer 39

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

Question 40

The steels ductility and weld ability decrease as _

Answer 40

Its carbon content increases

Question 41

What does 1020 stand for?

Answer 41

# 1 indicates the alloy group is carbon #0 indicates No major alloying element besides carbon #20 indicates 0.20% carbon content.

Question 42

What does 4340 mean?

Answer 42

#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

Question 43

Numbering system , what do the 4 digits means?

Answer 43

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

Question 44

What does a clearance fit indicate?

Answer 44

Shaft is always smaller than the bore

Question 45

What does a transition fit indicate?

Answer 45

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

Question 46

What does an interference fit indicate?

Answer 46

Shaft is larger than bore of machine

Question 47

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

Answer 47

Saddle key

Question 48

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

Answer 48

Feather keys

Question 49

What is the standard taper for tapered keys?

Answer 49

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

Question 50

What is an axle?

Answer 50

Rotating device on which a wheel is mounted

Question 51

What is a spindle?

Answer 51

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

Question 52

What is a journal?

Answer 52

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

Question 53

What does hot rolled refer to?

Answer 53

Finishing process in the manufacture of the steel.

Question 54

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

Answer 54

Finished shafting

Question 55

Where wear and corrosion are great is an example of

Answer 55

Alloy shafting

Question 56

What type of shafting is used for power transmissions?

Answer 56

Hollow shafting

Question 57

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?

Answer 57

1.5:1

Question 58

What does critical speed depend on? (4)

Answer 58

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

Question 59

What is critical speed?

Answer 59

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

Question 60

What does positive allowance refer to?

Answer 60

Minimum clearance between mating parts

Question 61

Negative allowance refers to?

Answer 61

Maximum interference

Question 62

What are the three methods of fitting?

Answer 62

Force fitting Shrink fitting Expansion fitting

Question 63

What is the growth formula?

Answer 63

L X (COEF) x T