Deck 10: Dimensioning

Question 1

Identify and describe two types of notes.

Answer 1

Local or specific notes-connected to specific features on views. General notes-separate from views and relate to the entire drawing.

Question 2

Describe running and sliding fits (RC), locational fits (LC, LT, LN), and force fits (FN).

Answer 2

. Running and sliding fits (RC) are intended to provide a similar running performance with suitable lubrication allowance throughout their range of sizes. Locational fits are intended to determine only the location of the mating parts, may be rigid or accurate (as with interference fits), or provide some freedom of location (as with clearance fits). LC-clearance fits; LT-transition fits; LN-interference fits. Force fits (FN) are interference fits maintaining constant bore pressures, varying directly with diameter.

Question 3

Define unidirectional dimensioning.

Answer 3

Unidirectional dimensioning: All numbers, figures, and notes be lettered horizontally and be read from bottom of drawing.

Question 4

What is the recommended length-to-height ratio of arrowheads?

Question 5

Name two classifications of dimensions.

Question 6

Give the standard height of dimension text.

Question 7

How should the decimal in numerals be treated?

Question 8

Define the following terms; examples can be used if appro- priate: actual size; bilateral tolerance; dimension; feature; limits of dimension; specified dimension; tolerance; unilat- eral tolerance.

Question 9

Describe how holes are located.

Question 10

Identify a possible disadvantage of chain dimensioning.

Question 11

Define maximum material condition (MMC).

Question 12

Discuss proper dimension line spacing.

Question 13

Should all of the dimension arrowheads on a drawing be the same size?

Question 14

Specify the ASME document that governs the standard for dimensioning and tolerancing.

Question 15

How are notes for holes dimensioned on an engineering document?

Question 16

When all dimensions are metric, what is the general note that should accompany the drawing?

Question 17

What are the recommended standard units of linear mea- surements on engineering documents?

Question 18

Define least material condition (LMC).

Question 19

Describe baseline dimensioning.

Question 20

Describe a clearance fit.

Question 21

Describe the surface condition and process used to estab- lish the following surface roughness heights given in mi- crometers: 12.5, 6.3, 3.2, 1.6, 0.80, 0.20, 0.050. Appendix E is a reference in addition to this chapter content.

Question 22

Describe a delta note and when it is used.

Question 23

Define forging. (See Chapter 5.)

Question 24

Where are the general notes placed when using Military standards?

Question 25

Define parting line.

Question 26

Discuss the possible results of designing a part with specifi- cations that require overmachining.

Question 27

Show three examples of the recommended placement of surface finish symbols.

Question 28

What does it mean when a note such as .010 MAX DRAFT ANGLE is applied to the drawing for a plastic part?

Question 29

List three factors that influence sheet size selection.

Question 30

Identify two factors that influence drawing scale selection.

Question 31

Where are general notes generally placed when using ASME standards?

Question 32

Identify the units used to measure surface roughness height.

Question 33

Describe tabular dimensioning.

Question 34

Explain the difference between jigs and fixtures.

Question 35

Define surface finish.

Question 36

Define core. (See Chapter 5.)

Question 37

Explain the purpose of draft angle on a casting or forging.

Question 38

Explain what 1DFT means when applied to a dimension.

Question 39

Define casting. (See Chapter 5.)

Question 40

What does 2DFT mean when applied to a dimension?

Question 41

Define and describe the use of progressive dies.

Question 42

Drill fixtures are sometimes referred to as what?

Question 43

Briefly explain the purpose of the ISO 9000 Quality Systems Standard.

Question 44

Briefly explain the use of inspection fixtures.

Question 45

Briefly describe the function of the ISO 9001.

Question 46

Why is it important for a tool designer to be a good print reader?

Question 47

Explain the purpose of the ISO 9000-1.

Question 48

Describe the function of welding fixtures.

Question 49

Identify at least four qualities that tools must have.

Question 50

Give at least five reasons why an organization might want to have an ISO 9000 registration.

Question 51

Describe the use of drill jigs.

Question 52

What is the purpose of the ISO 9003 standard?

Question 53

What is a pickoff jig?

Question 54

What does ISO stand for?

Question 55

Describe the ISO 9002 standard.

Question 56

Explain how machining fixtures work.

Question 57

Give the name of the organization that represents the United States in the ISO 9000.

Question 58

Normally a jig or fixture is drawn as an assembly of the unit ready for use, and the workpiece or part to be held is drawn in position. How is the workpiece drawn in relationship to the jig or fixture?

Question 59

Describe the use of drill fixtures.

Question 60

Explain the purpose of the ISO 9004-1 standard.

Question 61

Give the name of the ISO 9001 standard that has been spe- cifically related to the automotive industry.

Question 62

Name the ISO 9001 standard that has been specifically re- lated to the aerospace industry. Part 2: General Tolerancing

Question 63

Calculate the shaft and hole limits for a 1.125 in. diameter shaft using an RC4 fit. Show and label the elements of your calculations.

Question 64

Determine the shaft and hole limits for a 1 in. diameter shaft using an RC4 fit. Show and label the elements of your calculations.

Question 65

Using standard metric limits and fits with tolerances of close running fits, determine the limits of a 25-mm shaft. Display the required dimension with limits followed by the code in parentheses.

Question 66

From the following list of given conditions, calculate the limits of the shaft and the limits of the hole. Show and label the elements of your calculations. (Review the allowance calculation formula.)

Question 67

Name five items that a CADD system needs in order to place a dimension.

Question 68

Using standard metric limits and fits with tolerances of close running fits, determine the limits of a 30-mm hole. Display the required dimension with limits followed by the code in parentheses.

Question 69

With standard metric limits and fits using close running fits, determine the limits of a 25-mm hole. Give the required di- mension with limits followed by the code in parentheses.

Question 70

List at least two reasons why CADD layering can assist the dimensioning process.

Question 71

Given the following CAD drawing, calculate the allowance. Show and label the elements of your calculation.

Question 72

Establish the shaft and hole limits for a .25 in. diameter shaft using an RC4 fit. Show and label the elements of your calculations.

Question 73

Question 74

By means of standard metric limits and fits with tolerances of close running fits, determine the limits of a 30-mm shaft. Show the required dimension with limits followed by the code in parentheses.

Question 75

Define layering.