Chapter 5

Question 1

What is tolerance

Answer 1

The amount by which a specified dimension is permitted to vary

Question 2

What is the difference between bilateral an unilateral tolerance

Answer 2

Bilatera: alows variations in both positve and negative while unilateral only on one (either one)

Question 3

What is accuracy in measurement

Answer 3

Degree to whcih a measured vaue agrees with the true value.

Question 4

What is precision measurement

Answer 4

measurement where degree towhich random errors occur are minimmized

Question 5

Graduated measuring device

Answer 5

HAS MARKINGS

Question 6

Why Surfaces important?

Answer 6

aesthetics, safety, ficiton and wear. effect of surface on mechanical and physical properties, mating oc components in assembly and electrical contacts

Question 7

nominal surface?

Answer 7

ideal part of the surface represented on an engineering drawing (perfectly )

Question 8

Surface texture

Answer 8

Random and reptitibe deviation from the nominal surface including roughness waviness, lay, and flaws

Question 9

How is the surface texture distinguished from surface integrity

Answer 9

rexture refers to geometry, integrity refers to the surface and the surface layer beneath

Question 10

Within the scope of surface texture, how is roughness distinguished form waviness

Answer 10

Roughmess finely spaced deviations, waviens: deviation of larger spacing. Rouhgness deviation lie within waviness dviation

Question 11

Surface roughness ?

Answer 11

average value of the vertical deviation form the nominal surface over a specifies surface length

Question 12

Limitation os using surface roughness as measure of surface texture

Answer 12

surface roughness provides only a single measure of surface texture. limitations. q. varies on direction. 2. does not indicate lay. 3. itv value depends on the roughnesswidth cutoff used to measure averafe

Question 13

Identify some of teh changes and injuires that can occur at or immediately below the surface of metal

Answer 13

cracks, craters, variation in hardness, metallurgical changes from heat, residual stresses, intragranual attack (Table 5.1)

Question 14

What causes various types of changes that occur in the altered layer just beneath the surfacce

Answer 14

Energy input to the surface resulting from amnyfacturnig process used to generate the surface. The energy forms can be any of several types like mechanical, theimal, chemical and electrical

Question 15

Commln methods for assesing surface roughness

Answer 15

Comparioson with test blocks, stylus electronics

Question 16

Manufacturing process that have poor surface finishes

Answer 16

Casting, hot rolling, swaing, therl cutting