Study Guide for Test 4

Question 1

3 Methods used for fastening

Answer 1

Mechanical fastening
Bonding
Forming

Question 2

__________ developed the English standard screw in the 1800’s

Answer 2

Joseph Whitworth

Question 3

The threads proposed by __________, the United States adopted their own threads in 1864.

Answer 3

William Sellers

Question 4

The unified thread organization for Standardization is the current thread we are using in the United States.

Answer 4

true

Question 5

What 3 applications are used with mechanical thread fasteners

Answer 5

Joining
Adjusting
Power Transmission

Question 6

The peak or top surface of a screw thread __________

Answer 6

crest

Question 7

The distance between corresponding points on adjacent thread forms __________

Answer 7

pitch

Question 8

The bottom of a screw thread cut into a cylinder ___________

Answer 8

root

Question 9

The distance a screw will travel when turned one one revolution __________

Answer 9

lead

Question 10

Used to make a hole in metal before tapping an internal thread

Answer 10

tap drill

Question 11

The __________ is equal to the difference between the major diameter and the minor diameter

Answer 11

depth

Question 12

One thread form series is unified

Answer 12

true

Question 13

List in order the five minimum pieces of information you provide in a thread specification note

Answer 13

1. Major Diameter
2. Threads per inch
   3.Thread form
3. Thread series
4. Class of Fit

Question 14

List 5 different threads used in the industry.

Answer 14

acme, sharp V, unified, square, knuckle

Question 15

One revolution equals 360 degrees

Answer 15

True

Question 16

Explain the difference between a right handed thread and a left handed thread

Answer 16

Right handed tightens when turned clockwise
Left handed tightens when turned counter clockwise

Question 17

The class of fit can be omitted if it is a class 2

Answer 17

true

Question 18

pitch=

Answer 18

1/TPI

Question 19

TPI=

Answer 19

1/pitch

Question 20

Internal, Unified, Major diameter .375, Class 2, Course

Answer 20

.375-16 UNC-2B

Question 21

Major diameter .75, Unified, 16 threads per inch, External, Class 3

Answer 21

.750-16 UNF-3A

Question 22

Left Handed, Triple lead, depth, 1.5, internal threads, unified, Major diameter .25, Extra Fine, Class 1

Answer 22

.250-32 UNEF-1B-LH-TRIPLE ↧ 1.5

Question 23

Label each part of the thread specification note

M14 x 1.5-4H5G

Answer 23

M - is the thread form
14- is the nominal size (major diameter)
1.5 is the pitch
4H5G is the Tolerance Class

Question 24

What are the three types of thread representation?

Answer 24

1. Orthographic projection
2. Sectional View
   3.Auxiliary View