ACCIONES PARA IMPLEMENTACIÓN INICIAL, SEGUIMIENTO Y RECOMENDACIONES DE IMPLEMENTACIÓN:

5.2. What is the difference between a bilateral tolerance and a unilateral tolerance?

5.3. What is accuracy in measurement? 5.4. What is precision in measurement?

5.5. What is meant by the term graduated measuring device?

5.6. What are some of the reasons why surfaces are important?

5.7. Define nominal surface. 5.8. Define surface texture.

5.9. How is surface texture distinguished from surface integrity?

5.10. Within the scope of surface texture, how is rough- ness distinguished from waviness?

5.11. Surface roughness is a measurable aspect of surface texture; what does surface roughness mean? 5.12. Indicate some of the limitations of using surface

roughness as a measure of surface texture.

5.13. Identify some of the changes and injuries that can occur at or immediately below the surface of a metal. 5.14. What causes the various types of changes that occur

in the altered layer just beneath the surface? 5.15. What are the common methods for assessing sur-

face roughness?

5.16. Name some manufacturing processes that produce very poor surface finishes.

5.17. Name some manufacturing processes that produce very good or excellent surface finishes.

5.18. (Video) Based on the video about vernier calipers, are the markings on the vernier plate (moveable scale) the same spacing, slightly closer, or slightly further apart compared to the stationary bar? 5.19. (Video) Based on the video about vernier calipers,

explain how to read the scale on a vernier caliper. 5.20. (Video) Based on the video about micrometers, explain the primary factor that makes an English micrometer different from a metric micrometer.

MULTIPLE CHOICE QUIZ

There are 19 correct answers in the following multiple choice questions (some questions have multiple answers that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each correct answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and each additional answer beyond the correct number of answers reduces the score by 1 point. Percentage score on the quiz is based on the total number of correct answers.

5.1. A tolerance is which one of the following: (a) clearance between a shaft and a mating hole, (b) measurement error, (c) total permissible variation from a specified dimension, or (d) variation in manufacturing? 5.2. Which of the following two geometric terms have

the same meaning: (a) circularity, (b) concentricity, (c) cylindricity, and (d) roundness?

5.3. A surface plate is most typically made of which one of the following materials: (a) aluminum oxide ceramic, (b) cast iron, (c) granite, (d) hard polymers, or (e) stainless steel?

5.4. An outside micrometer would be appropriate for measuring which of the following (two correct answers): (a) hole depth, (b) hole diameter, (c) 96 Chapter 5/Dimensions, Surfaces, and their Measurement

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part length, (d) shaft diameter, and (e) surface roughness?

5.5. In a GO/NO-GO gage, which one of the following best describes the function of the GO gage: (a) checks limit of maximum tolerance, (b) checks maximum material condition, (c) checks maximum size, (d) checks minimum material condition, or (e) checks minimum size?

5.6. Which of the following are likely to be GO/NO-GO gages (three correct answers): (a) gage blocks, (b) limit gage, (c) master gage, (d) plug gage, and (e) snap gage?

5.7. Surface texture includes which of the following characteristics of a surface (three correct answers): (a) deviations from the nominal surface, (b) feed marks of the tool that produced the surface, (c)

hardness variations, (d) oil films, and (e) surface cracks?

5.8. Surface texture is included within the scope of surface integrity: (a) true or (b) false?

5.9. Thermal energy is normally associated with which of the following changes in the altered layer (three best answers): (a) cracks, (b) hardness variations, (c) heat affected zone, (d) plastic deformation, (e) recrystallization, or (f) voids?

5.10. Which one of the following manufacturing pro- cesses will likely result in the best surface finish: (a) arc welding, (b) grinding, (c) machining, (d) sand casting, or (e) sawing?

5.11. Which one of the following manufacturing pro- cesses will likely result in the worst surface finish: (a) cold rolling, (b) grinding, (c) machining, (d) sand casting, or (e) sawing?

PROBLEMS

5.1. Design the nominal sizes of aGO/NO-GO plug gage to inspecta 1.5000.030indiameterhole.Thereisawear allowance applied only to the GO side of the gage. The wear allowance is 2% of the entire tolerance band for the inspected feature. Determine (a) the nominal size of the GO gage including the wear allowance and (b) the nominal size of the NO-GO gage.

5.2. Design the nominal sizes of a GO/NO-GO snap gage to inspect the diameter of a shaft that is 1.500 0.030. A wear allowance of 2% of the entire toler- ance band is applied to the GO side. Determine (a) the nominal size of the GO gage including the wear allowance and (b) the nominal size of the NO-GO gage.

5.3. Design the nominal sizes of a GO/NO-GO plug gage to inspect a 30.00 0.18 mm diameter hole. There is a wear allowance applied only to the GO side of the gage. The wear allowance is 3% of the entire tolerance band for the inspected feature. Determine (a) the nominal size of the GO gage including the wear allowance and (b) the nominal size of the NO-GO gage.

5.4. Design the nominal sizes of a GO/NO-GO snap gage to inspect the diameter of a shaft that is 30.00

0.18 mm. A wear allowance of 3% of the entire tolerance band is applied to the GO side. Deter- mine (a) the nominal size of the GO gage including the wear allowance and (b) the nominal size of the NO-GO gage.

5.5. A sine bar is used to determine the angle of a part feature. The length of the sine bar is 6.000 in. The rolls have a diameter of 1.000 in. All inspection is performed on a surface plate. In order for the sine bar to match the angle of the part, the following gage blocks must be stacked: 2.0000, 0.5000, 0.3550. Determine the angle of the part feature.

5.6. A 200.00 mm sine bar is used to inspect an angle on a part. The angle has a dimension of 35.0  1.8. The sine bar rolls have a diameter of 30.0 mm. A set of gage blocks is available that can form any height from 10.0000 to 199.9975 mm in increments of 0.0025 mm. Determine (a) the height of the gage block stack to inspect the minimum angle, (b) height of the gage block stack to inspect the maxi- mum angle, and (c) smallest increment of angle that can be setup at the nominal angle size. All inspec- tion is performed on a surface plate.

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