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Orthographic Projection2 Dimensional View of an object
Ken Youssefi
Product Design I (40)
1
Different Viewpoint
Ken Youssefi
Product Design I (40)
2
Parallel Projection
Perspective
Ken Youssefi
Product Design I (40)
Parallel
3
Orthographic Projection
Ken Youssefi
Product Design I (40)
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Standard 2D views
Ken Youssefi
Product Design I (40)
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View Orientation
Poor orientation Good orientation6
Ken Youssefi
Product Design I (40)
Type of Planes
Oblique
Principal
Inclined
Ken Youssefi
Product Design I (40)
7
Edge View of a PlanePrincipal planes appear in true size in one plane and as an edge view in the other two planes.
Ken Youssefi
Product Design I (40)
8
Section ViewsOrthographic views showing all hidden lines may not be clear enough to describe an objects internal details. This shortcoming can be overcome by imagining that part of the object has been cut away and shown in a crosssectional view. This view is called a section view.
Ken Youssefi
Product Design I (40)
9
Type of Section Views Full section view Offset section view (multiple offset views) Half section view Broken section view Aligned and Revolved section views Removed view
Ken Youssefi
Product Design I (40)
10
Section View Full Section
Ken Youssefi
Product Design I (40)
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Section View Offset SectionOffset cutting plane
Ken Youssefi
Product Design I (40)
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Section View Multiple Offset Sections
Ken Youssefi
Product Design I (40)
13
Section View Half Section
Ken Youssefi
Product Design I (40)
14
Section View Broken Section
Ken Youssefi
Product Design I (40)
15
Dimensioning & Tolerancing
Ken Youssefi
Product Design I (40)
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Dimensioning Size dimensions
Location and orientation dimensions
Ken Youssefi
Product Design I (40)
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Dimensioning TerminologyDimension line Numerical value that defines the size and location Gap
1.25Extension line
Extension line offset
Ken Youssefi
Product Design I (40)
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NX drafting
Annotation Preferences
Ken Youssefi
Product Design I (40)
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Placement of Dimensions
Ken Youssefi
Product Design I (40)
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Dos & Donts of Dimensioning
Never dimension hidden linesKen Youssefi Product Design I (40)
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Dos & Donts of Dimensioning
Ken Youssefi
Product Design I (40)
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Dimensioning
Ken Youssefi
Product Design I (40)
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Avoid Over-Dimensioning
Ken Youssefi
Product Design I (40)
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Avoid Over-Dimensioning
= tan-1(12.7/7.1) = 60.8o
Ken Youssefi
Product Design I (40)
25
Basic Dimensioning StyleContinue dimensioning Baseline dimensioning
Ordinate dimensioningKen Youssefi Product Design I (40)
26
TolerancingTolerancing is the technique of dimensioning parts within a desired range of variation. Why tolerancing?
Parts made by different companies have to be interchangeable. Mating parts have to fit precisely.
Ken Youssefi
Product Design I (40)
27
Size Tolerancing Bilateral 1.250 .003 Unilateral 1.250+ _ .001 .003
Limit Form 1.251 1.247Ken Youssefi Product Design I (40)
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Mating Parts
Ken Youssefi
Product Design I (40)
29
Type of Fits for Mating Parts Clearance Fitmating parts. Results in a space between the
Interference Fit Transition Fitor clearance fit.
Results in an interference between two parts (no space). It requires force to assemble parts (force fit). May results in either interference
Ken Youssefi
Product Design I (40)
30
Example Clearance Fit
Ken Youssefi
Product Design I (40)
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ANSI Tables for FitsClearance fits (running and sliding) RC1 to RC9
Ken Youssefi
Product Design I (40)
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ANSI Tables for FitsClearance fits (Locational) LC1 to LC11
Ken Youssefi
Product Design I (40)
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ANSI Tables for FitsInterference fits (Force and Shrink fits) FN1 to FN5
Ken Youssefi
Product Design I (40)
34
Geometric Tolerancing Geometric Dimensioning and Tolerancing (GDT)GDT defines the features of a part more efficiently than just the size. It also defines the standards for verifying the specified size and form. ANSI Y14.5-1994
Ken Youssefi
Product Design I (40)
35
Geometric TolerancingGeometric tolerancing is a system that specifies the form, profile, orientation, and location of parts features using the ANSI standards.
Ken Youssefi
Product Design I (40)
36
Geometric Tolerancing - ExamplesForm tolerancing
Flatness Profile tolerancing
Straightness
Line
Ken Youssefi
Product Design I (40)
37
Geometric Tolerancing - ExamplesOrientation tolerancing Perpendicularity
ParallelismKen Youssefi Product Design I (40)
Angularity38
Geometric Tolerancing - ExamplesLocation tolerancing
Concentricity
Symmetry
Ken Youssefi
Product Design I (40)
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