Deck 11: Fasteners and

Question 1

Define the screw thread terms given in questions
Axis

Answer 1

Axis: The centerline of the cylindrical thread shape

Question 2

What assumption is made about the thread if LH is not placed at the end of the thread note?

Answer 2

. A right-hand thread is assumed.

Question 3

When is the abbreviation LH used at the end of a thread note?

Answer 3

. LH at end of thread note identifies a left-hand thread.

Question 4

Define the screw thread terms given in questions
Tap drill

Question 5

Define the screw thread terms given in questions
Pitch

Question 6

Define the screw thread terms given in questions
Tap

Question 7

Define the screw thread terms given in questions
Threads per inch

Question 8

Define the screw thread terms given in questions
Classes of threads

Question 9

Define the screw thread terms given in questions
Minor diameter

Question 10

Define the screw thread terms given in questions
Fit

Question 11

Identify the components of the following unified screw thread note.

Question 12

Identify the components of the following metric thread note.

Question 13

Why is it common, when possible, to drill deeper than the intended depth of the tap?

Question 14

Name and describe three types of taps.

Question 15

Define the screw thread terms given in questions
Thread

Question 16

What thread representation is most commonly used and why?

Question 17

Why should an internal tap be deeper than the fastener thread?

Question 18

Define the screw thread terms given in questions
Major diameter

Question 19

Define the screw thread terms given in questions
Die

Question 20

Name the three methods of thread representation.

Question 21

Plug taps generally have how many lead in chamfers?

Question 22

Define blind hole.

Question 23

What are rivets used for, and how are they applied?

Question 24

What is the principal application for keys?

Question 25

Give two problems that can occur when designing fea- tures that do not provide enough allowance for runout or sufficient room for the tool.

Question 26

Give three reasons why through threaded holes are pre- ferred over blind threaded holes from a manufacturing standpoint.

Question 27

Name the type of tap that is the most commonly used pro- duction tool for thread forming.

Question 28

Identify two applications for washers.

Question 29

How are standard key sizes determined?

Question 30

Identify two applications for taper pins.

Question 31

Give the minimum formula that you would use when deter- mining pilot hole depth.

Question 32

Taper taps generally have how many lead in chamfers?

Question 33

Bottoming taps generally have how many lead in chamfers?

Question 34

Identify two functions of thread inserts.

Question 35

Define keyseat.

Question 36

Standard thread forming tools generally have lead in cham- fers that produce how many incomplete threads on the leading edge of the tool?

Question 37

What are set screws used for?

Question 38

Define runout.

Question 39

What are retaining rings used for?

Question 40

What type of information is required to completely identify a bolt or screw?

Question 41

Describe spring index and explain what the spring index is a factor in determining.

Question 42

Describe a flat spring and give at least one use for a flat spring.

Question 43

If a relief is used on external threads, the applied relief diameter should not exceed what specification?

Question 44

Give the basic function of a torsion spring.

Question 45

Identify at least one design factor related to helix direction.

Question 46

External threads should have a lead in chamfer for tooling. Give the general guideline for the applied chamfer diameter for this application.

Question 47

Give the specifi cations for a reasonable chamfer or counter- sink on the pilot hole. ChaPTer 11 FasTeners

Question 48

What does a thread chamfer or countersink in the pilot hole help prevent?

Question 49

Define self-clinching fastener.

Question 50

List the three major functions of pipe threads.

Question 51

Define spring pitch.

Question 52

Give the drawing angle that is recommended for represent- ing a taper pipe thread.

Question 53

According to ASME Y14.6, what is the general guideline for the dimension specified on a drawing for thread depth in a blind hole?

Question 54

Identify the two optional provisions that must be used when designing a threaded joint with a shoulder.

Question 55

Identify at least three design criteria used in spring design.

Question 56

What is helix direction, and how is helix direction specified?

Question 57

Define coil related to spring terminology, and identify active coils and total coils.

Question 58

Describe deflection related to a compression spring and an extension spring.

Question 59

Give the general rule that can be used when designing the and sPrings Problems minimum tool runout for external threads.

Question 60

Define spring and give the basic design principle.

Question 61

Identify and name the national standard that provides de- tailed descriptions, drafting practices, and examples of most common springs used in manufacturing.

Question 62

Discuss why the schematic spring representation is not as commonly used as the detailed spring representation.

Question 63

Give another name for wave springs, and describe the ad- vantage of using wave springs rather than coil springs.

Question 64

Briefly explain the application of phantom lines used when drawing a detailed thread representation. Phantom lines can be used to simplify the drafting of repeated detail.

Question 65

No matter which spring representation method is used, several important specifications must accompany the spring drawing. What is this information or specification called, and how is it placed on the drawing? List at least eight items that are included.