Chapter 2

Question 1

What is the crest and root

Answer 1

Crest 
    \_\_.        \_\_
  /     \     /.    \
/         \_/.        \
          Root
The flat part of the pitch is re crest and the opposite flat part at the bottom is the root

Question 2

Major diameter
Pitch diameter
Minor diameter

Answer 2

MAJOR is from crest to crest
MINOR is from root to root

PITCH is an imaginary line between those two

Question 3

Thread angle

Answer 3

Angle formed by the sides of the thread at the root

Question 4

Pitch of a fastener

Answer 4

Distance of one crest to the next

Question 5

Fine threads

Answer 5

HOLDING POWER
TAP EASIER
FINE AJUSMENTS

Used in high strength applications

Question 6

Coarse threads

Answer 6

CHEAPER
TOLERATE ABUSE /STURDY
LESS CROSS THREAD

Used on plastics, aluminum or cast iron

Question 7

What does ANSI and ASME mean

Answer 7

American national standards institute

American society of mechanical engineers

Question 8

What determines classes of fasteners

Answer 8

TOLERENCE (amount of size differences allowed from exact size

ALLWOENCES: (how loosely or tightly they fit

Question 9

Internal vs external allowances

Answer 9

External always ends in A
internal always ends in B

CLASS 1A and 2B most allowance
2A and 2B
3A and 3B. Least allowence

Question 10

Strength of bolts

Answer 10

Grade 1 and 2
       No Marks
Grade 5 
        3 lines
Grade 8
        6 lines

Question 11

Joseph whitworth
Or
William sellers

Answer 11

Thread angle of 55 degrees

Thread angel of 60 degrees and was adopted by for the American national standard thread

Question 12

What is the bitch of a fasteners $

Answer 12

Distance from one crest to another

Question 13

Most fasteners are right-handed which way should they be turned$

Answer 13

Clock wise

Question 14

Where is the unified thread system used $

Answer 14

America

Question 15

What is the most common class of fit in the unified system$

Answer 15

Grade 5

Question 16

What in formation does property class tell you about a metric bolt$

Answer 16

2 numbers
Minimum tensile strength
Minimum yield strength

Question 17

What is a setscrew and where is it used$

Answer 17

Headless fastener used to lock an object to a shaft

Question 18

Which fastener point is the greatest holding power$

Answer 18

Come point

Question 19

What is the main disadvantage of the cone point$

Answer 19

Does most damage to shaft

Question 20

Explain the correct way to cut off a hex nut with a hammer and chisel$

Answer 20

Chisel cuts parallel to the threads. Make sure you have eye protection and the chisel is sharp

Question 21

What is the most common use for solid dies$

Answer 21

Dies are used to cut external threads.

Solid die is MOST OFTEN used for changing or recutting damaged threads