Orthographic Projection2 Dimensional View of an object

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Product Design I (40)

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Different Viewpoint

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Product Design I (40)

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Parallel Projection

Perspective

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Product Design I (40)

Parallel

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Orthographic Projection

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Product Design I (40)

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Standard 2D views

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View Orientation

Poor orientation Good orientation6

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Product Design I (40)

Type of Planes

Oblique

Principal

Inclined

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Product Design I (40)

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Edge View of a PlanePrincipal planes appear in true size in one plane and as an edge view in the other two planes.

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Product Design I (40)

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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.

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Product Design I (40)

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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

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Section View Full Section

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Section View Offset SectionOffset cutting plane

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Product Design I (40)

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Section View Multiple Offset Sections

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Product Design I (40)

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Section View Half Section

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Product Design I (40)

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Section View Broken Section

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Product Design I (40)

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Dimensioning & Tolerancing

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Product Design I (40)

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Dimensioning Size dimensions

Location and orientation dimensions

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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

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NX drafting

Annotation Preferences

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Product Design I (40)

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Placement of Dimensions

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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

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Product Design I (40)

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Dimensioning

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Product Design I (40)

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Avoid Over-Dimensioning

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Product Design I (40)

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Avoid Over-Dimensioning

= tan-1(12.7/7.1) = 60.8o

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Product Design I (40)

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Basic Dimensioning StyleContinue dimensioning Baseline dimensioning

Ordinate dimensioningKen Youssefi Product Design I (40)

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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.

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Product Design I (40)

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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

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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

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Example Clearance Fit

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ANSI Tables for FitsClearance fits (running and sliding) RC1 to RC9

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ANSI Tables for FitsClearance fits (Locational) LC1 to LC11

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ANSI Tables for FitsInterference fits (Force and Shrink fits) FN1 to FN5

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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

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Product Design I (40)

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Geometric TolerancingGeometric tolerancing is a system that specifies the form, profile, orientation, and location of parts features using the ANSI standards.

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Product Design I (40)

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Geometric Tolerancing - ExamplesForm tolerancing

Flatness Profile tolerancing

Straightness

Line

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Geometric Tolerancing - ExamplesOrientation tolerancing Perpendicularity

ParallelismKen Youssefi Product Design I (40)

Angularity38

Geometric Tolerancing - ExamplesLocation tolerancing

Concentricity

Symmetry

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Product Design I (40)

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