Deck 9: Reading Prints With Fasteners and Springs

Question 1

The plug tap can be used to help begin to thread through material.

Answer 1

FALSE

Question 2

Vanish is produced by the chamfer at the starting end of the thread forming tool.

Answer 2

TRUE

Question 3

A blind hole is a hole that goes through the material in a way that you cannot see it.

Answer 3

FALSE

Question 4

Keyseat depth dimensions are established in relationship to the shaft radius.

Question 5

A left hand thread is a thread that engages with a mating thread by rotating counterclockwise or with a turn to the left when viewed toward the mating thread.

Question 6

A lathe is a machine that holds a piece of material between two centers or in a chucking device.

Question 7

Nominal pipe size is the outside pipe diameter.

Question 8

The body of a screw is that portion of a screw shaft that is left threaded.

Question 9

A die is a machine tool used for cutting internal threads.

Question 10

Chamfers are commonly applied to the third thread to help start a thread in its mating part.

Question 11

The taper tap is generally used for starting a thread.

Question 12

A rivet is a metal pin without a head used to fasten two or more materials together.

Question 13

Simplified representations clearly describe threads and are the most commonly used thread representations.

Question 14

Screw threads are a helix or conical spiral form on the external surface of a shaft, or internal surface of a cylindrical hole.

Question 15

A key is an important machine element that is employed to provide a negative connection for transmitting torque between a shaft and a hub, pulley, or wheels.

Question 16

The buttress thread is commonly used in situations where tubular features are screwed together and lateral forces are exerted in one direction.

Question 17

Acme thread forms are commonly used when rapid reversing movement is a design requirement.

Question 18

Pitch is the distance measured parallel to the axis from the point on one thread to the corresponding point on the adverse thread.

Question 19

The chamfer is an angular relief at the last thread to help allow the thread to disengage with a mating part more easily.

Question 20

Square threads were developed as threads that would effectively transmit power.

Question 21

Cap screws are fine finished machine screws that are generally used with a nut.

Question 22

Simplified representations are the least commonly used in the industry, because they do not show thread detail.

Question 23

Washers serve as a cushion or a bearing surface for a bold head or nut.

Question 24

The quickest and easiest way to determine the thread specification of an existing thread is with a screw pitch gage.

Question 25

Vanish thread is also referred to as a partial thread, washout thread, or thread runout, and is that portion of the incomplete thread which is not fully formed at root or at crest and root.

Question 26

Lag screws are designed to attach metal to metal.

Question 27

The detailed thread prints for American National Standard taper pipe threads are the same as Unified threads except that the major and minor diameters taper at a rate of .0625 inches per inch.

Question 28

Screw thread inserts can be designed to provide a secure mating of fasteners in situations where vibrations or movement could cause parts to loosen.

Question 29

Hexagon head fasteners are generally shown on a print with the hexagon position across the flats horizontally in the front view.

Question 30

Detailed external and sectioned threads, and detailed internal threads can be seen in a multiview print.

Question 31

Schematic thread representations are represent the approximate appearance of threads by lines spaced equal to the diameter of the thread.

Question 32

The shape of a set screw head is usually round.

Question 33

Self tapping screws are used to hold two or more mating parts when one of the parts becomes a fastening device.

Question 34

Dowel pins must generally be pressed into a hole with an interference tolerance of between 0.002 inches to 0.01 inches, depending on the material and the function of the parts.

Question 35

Threaded fasteners are any of the thread forms that can be used for fastening two or more features or parts together.

Question 36

A thread note must always be in the same order and be accurate; otherwise, the thread cannot be manufactured correctly.

Question 37

Machine screws always have chamfers.

Question 38

Springs are designed to expend energy for the purpose of pushing or pulling machine parts by reflex action into certain desired positions.

Question 39

When measuring features from prototypes or existing parts, the screw thread size can be determined on a fastener or threaded part by diagram.

Question 40

Screw thread inserts are conically formed coils of diamond shaped wire made of stainless steel or phosphor bronze.

Question 41

Standard thread forming tools generally have lead chamfers that produce five or more incomplete threads on the leading edge of the tool.

Question 42

Rivets are classified by ____.

A) length
B) head type
C) body diameter
D) all of the above
E) none of the above

Question 43

The effective use of springs in machine design depends on several basic criteria. Which of the following is not one of those criteria?

A) function stresses
B) tolerances
C) smoothness
D) material
E) none of the above

Question 44

Flat springs are arched or bent flat metal shapes designed so when placed in machinery they create flexibility on adjacent parts.

Question 45

Self-clinching nuts are used when strong internal threads are needed for component attachment or fabrication assembly.

Question 46

A reasonable countersink is 82° inclusive.

Question 47

A spring is a mechanical device often in the form of a ____ coil that yields by expansion or contraction due to ____ applied.

A) helical; pressure
B) hexagonal; force
C) helical; stress
D) helical; force
E) a, c, and d

Question 48

The incomplete threads are called runout.

Question 49

Unground or rough ends are more expensive than ground ends in compression springs.

Question 50

Threads that resist vibrations and remain tight without auxiliary locking devices are called ____ threads.

A) buttress
B) Acme
C) dardelet
D) rolled
E) none of the above

Question 51

Threads per inch is the number of threads measured in one inch. The reciprocal of the pitch in inches.

Question 52

The standardization of screw threads was achieved in ____ in 1949.

A) the United Kingdom
B) Canada
C) the United States
D) all of the above
E) none of the above

Question 53

A self-clinching fastener is any device, usually threaded, that displaces the material around a mounting hole when pressed into a properly sized drilled or punched hole.

Question 54

Threaded rod is an external thread machined on a shaft without a head.

Question 55

____ is the bottom of external and the top of internal threads.

A) Root
B) Clevis
C) Keyseat
D) Pitch
E) none of the above

Question 56

Self-clinching nuts feature thread strengths less than mild screw and used when not so strong internal engagement is required.

Question 57

Through holes are preferred over blind holes.

Question 58

A note is used to specify a pipe thread on a print.

Question 59

A blind hole is a hole that does not go through which then requires a pilot hole.

Question 60

The most common method of producing an internal thread is the process of boring.

Question 61

Spring function depends on ____.

A) retraction
B) compression
C) extension
D) both b and c
E) all of the above

Question 62

____ threads are the original British standard thread forms developed in 1841.

A) Whitworth threads
B) Acme threads
C) JKS threads
D) Dardelet threads
E) none of the above

Question 63

____ is an option for use on prints.

A) Free length compression spring
B) Schematic spring representation
C) Loading extension spring
D) both a and b
E) none of the above

Question 64

____ are available as fasteners to provide a stop or shoulder for holding bearings or other parts on a shaft.

A) Internal retaining rings
B) External retaining rings
C) External taper pins
D) both a and b
E) none of the above

Question 65

____ transmit energy by a turning or twisting action.

A) Helix springs
B) Torsion springs
C) Flat springs
D) Compression springs
E) none of the above

Question 66

Detailed threads are not common on most manufacturing prints because ____.

A) they cannot be drawn accurately enough
B) they are much too time consuming to draw unless CADD is used
C) simplified thread representations are always used for print threads
D) both a and b
E) none of the above

Question 67

Set screws are used ____.

A) to help prevent rotary motion
B) to transmit power between two parts such as a pulley and a shaft
C) to reduce high stress which occurs in one direction along a thread axis
D) both a and b
E) all of the above

Question 68

____ threads are the most common threads used on threaded fasteners.

A) Acme threads
B) Buttress threads
C) Rolled threads
D) Unified threads
E) none of the above

Question 69

The top of external and the bottom of internal threads is the ____.

A) pitch
B) root
C) crest
D) fit
E) none of the above

Question 70

____ is the dimension from root to root through the axis on an external thread and measured across the crests through the center for an internal thread.

A) Minor diameter
B) Pitch diameter
C) Major diameter
D) Chamfer angle
E) none of the above

Question 71

Taper pins are used ____.

A) for parts that have to be taken apart frequently
B) where removal of straight dowel pins can cause excess hole wear
C) for applications that require perfect alignment of accurately constructed parts
D) both a and b
E) all of the above

Question 72

In springs, the compression length ____.

A) is the maximum recommended design length for the spring when compressed
B) is the actual length of the spring when compressed under extreme conditions
C) is the theoretical length of the spring when compressed
D) is the actual length achieved when the compositional portions of the material are accumulated
E) none of the above

Question 73

The reciprocal of the pitch in inches.

A) Threads per inch
B) Minor diameter
C) Major diameter
D) Vanish
E) none of the above

Question 74

A thread series is a group of common major diameter and pitch characteristics determined ____.

A) by the material of the part
B) by the number of threads per inch
C) by the thread taper
D) both a and b
E) none of the above

Question 75

____ is provided at the end of the note.

A) The pitch diameter
B) The depth of internal threads
C) The length of external threads
D) both b and c
E) none of the above

Question 76

Which of the following is not a basic representation method for springs?

A) detailed
B) simplified
C) schematic
D) all of the above
E) none of the above

Question 77

The material note is usually found ____.

A) in the title block
B) near the revision block
C) with a leader pointing to one of the parts
D) both b and c
E) none of the above

Question 78

____ is defined as a twisting action that tends to turn one part or end around a longitudinal axis while the other part or end remains fixed.

A) Compression
B) Extension
C) Tortion
D) Expansion
E) none of the above

Question 79

____ are commonly used when rapid traversing movement is a design requirement.

A) Acme threads
B) Buttress threads
C) Rolled threads
D) Dardelet threads
E) none of the above

Question 80

Bolts can be ____ by torque applied to the head or to the nut.

A) driven
B) tightened
C) released
D) both b and c
E) all of the above