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DDF 102 - Size and Shape Description
I
Provides multiview and dimensioning techniques necessary to develop views that completely describe machine parts for manufacture. Topics include: multiview drawing, basic dimensioning practices, tolerances and fits, sketching, and precision measurement.
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Competency
Areas |
Hours |
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Multiview Drawing |
Class |
1 | |
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Basic Dimensioning Practices |
D. Lab |
9 | |
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Tolerances and Fits |
P. Lab/O.B.I. |
0 | |
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Sketching |
Credit |
5 | |
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Precision Measurement |
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Prerequisite/Corequisite: |
DDF 101 | ||
| Course Guide |
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Competency |
After completing this
section, the student will: |
Hours | ||
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Class |
D.Lab |
P.Lab/
O.B.I. | ||
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MULTIVIEW
DRAWING |
3 |
50 |
0 | |
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Theory |
State the theory of orthographic projection. |
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Explain the six principle planes/views of orthographic projection. |
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Identify first angle projecting. |
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Describe third angle projecting. |
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Identify third angle projecting. |
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Describe height, width, and depth. |
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Describe edge view, intersection, and surface limit. |
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State the use of dashed lines. |
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Explain the use and importance of center lines. |
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State the precedence of lines. |
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Orthographic projection |
Draw an object that is described with two views. |
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Draw an object that is described with three views. |
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Draw an object that has an inclined surface. |
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Draw an object that has an elliptical boundary. |
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Draw an object that has a curved boundary. |
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BASIC DIMENSIONING PRACTICES |
3 |
18 |
0 | |
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Principles |
State the two basic rules of dimensioning. |
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Explain how prisms, cylinders, right cones, right pyramids, oblique cones, oblique pyramids, and spheres are dimensioned. |
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Explain the contour principle of dimensioning. |
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State the characteristics of extension lines and leaders. |
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Describe the numerical systems used in dimensioning. |
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State the order of dimensioning. |
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Dimensioning |
Dimension an object using the contour principle. |
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Dimension an object with an arc. |
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Dimension an object with a curved boundary. |
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Dimension a cylinder. |
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Dimension a spherical surface. |
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Dimension an angle. |
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TOLERANCES AND FITS |
2 |
10 |
0 | |
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Nomenclature |
Explain nominal size, basic size, design size, dimension, tolerance, unilateral tolerance, bilateral tolerance, fit, actual fit, clearance fit, interference fit, transition fit, allowance, maximum material limit, minimum material limit, basic-hole system, and basic-shaft system. |
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Explain the difference between general tolerance and specific tolerance. |
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Identify the geometric tolerancing symbols according to ANSI Standard Y14.5M. |
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Draw and dimension an object requiring tolerances. |
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SKETCHING |
1 |
10 |
0 | |
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Sketch vertical, horizontal, and inclined lines. Sketch a circle. |
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Sketch and dimension an object using orthographic projection. |
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PRECISION MEASUREMENT |
1 |
2 |
0 | |
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Identify a micrometer, caliper, dial indicator, height gauge, depth gauge, and thickness gauge. |
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Demonstrate proper care and use of a micrometer, caliper, dial indicator, height gauge, depth gauge, and thickness gauge. |
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Measure objects using a micrometer, caliper, dial indicator, height gauge, depth gauge, and thickness gauge. |
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| Suggested Resources |
Suggested
Resources include textbooks shown below or most current edition.
Arnbal, C. A., & Crawford, J. V. (1982). Problems in engineering graphics.
Dubuque, IA: Kendall-Hunt.
Croft, F. M., et al. (1989). Engineering graphics. New York: John
Wiley & Sons.
Dent, J. B., et al. (1987). Fundamentals of engineering graphics
(4th ed.). New York: Macmillan.
Eide, A. R., et al. (1985). Engineering graphics fundamentals. New
York: McGraw-Hill.
Eide, A. R., et al. (1987). Engineering graphics problems book II to
accompany engineering graphics fundamentals (6th ed.). New York:
McGraw-Hill.