Question 1

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?

Accepted Answer

. Normally the workpiece is drawn using phantom lines, in a color such as red, or a combination of phantom lines and color.

Question 2

Describe how holes are located.

Accepted Answer

. Locate a hole center in the view where the hole appears as a circle, or in a sectional view.

Question 3

Define and describe the use of progressive dies.

Accepted Answer

. Progressive dies are the tooling used for punch press operation.

Question 4

Describe the use of drill jigs.

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Question 5

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

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Question 6

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

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Question 7

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

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Question 8

Describe a clearance fit.

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Question 9

Explain the purpose of the ISO 9000-1.

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Question 10

Define parting line.

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Question 11

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

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Question 12

How are notes for holes dimensioned on an engineering document?

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Question 13

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

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Question 14

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.

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Question 15

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.

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Question 16

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

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Question 17

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.

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Question 18

Name two classifications of dimensions.

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Question 19

Discuss proper dimension line spacing.

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Question 20

Describe a delta note and when it is used.

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Exam 10: Dimensioning