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Overview of
Graphics(alias Drafting)
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Importance of Graphics
Technical drawings graphically communicates a description of the part to be “manufactured” between the engineer and manufacturing/ marketing/ analytical group.
Also, it provides a vehicle for one’s thoughts to be visualized by another person
Universal language
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Drafting Standards
Standards organizations like ANSI (American National Standards Institute) and ISO (International Standards Organization) publish standards detailing how drawings should be created so they can be interpreted universally.– To eliminate confusion, American
National Standards Institute (ANSI) called on American Society for Engineering Education (ASEE), Society of Automotive Engineers (SAE), and American Society of Mechanical Engineers (ASME). Together they prepared American National Standard Drafting Manual Y14 (ANSI Y14). http://www.ansi.org
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Design & Graphic Communication
Types of Drawings– Artistic & Technical
What is a Technical Drawing– Technical
» related to scientific, industrial, or mechanical
– Drawing » a graphic representation of an object, an
idea, or a proposed design
– Technical Drawing » a graphic representation of an object, an
idea, or a proposed design that is scientific, industrial, electrical, or mechanical.
– Engineering Design Graphics» technical drawings representing designs &
specifications for physical objects
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Objectives in Drafting
Legibility– must be able to read and
interpret Accuracy
– valid and convey proper size or shape
Neatness– no smudges, rips, etc...
Speed– time is money
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Types of Communication Sketching – still used,
especially when designing a product
Board drawing – phasing out CAD
– Computer-Aided-Design or Computer-Aided-Drafting
CADD– Computer-Aided-Design and
Drafting
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A set of working drawings must:– Describe the parts – visually and
dimensionally.– Show the parts assembled.– Identify all parts.– Specify standard parts.
A set of working drawings contains the following items:– Assembly drawing– Detail drawings– Parts list– Specifications
Goal: Working Drawings
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Shape Description
3-dimensional (3D)
2-dimensional (2D)
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3-Dimensional (METBD 110)
2-Dimensional (METBD 110)
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Most Common Views
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Size Description
Dimensions
Notes
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Dimensions (METBD 110)
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Notes (METBD 110)
Written specifications: I.e.,– Note: All fillets and rounds are
R.13, unless otherwise specified.
– Note: Material 1/8 thick.
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Solid Modeling (METBD 110)
Pro/ENGINEER rest of semester
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Additional Topics
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Section View (METBD 110 &
111)
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Auxiliary Views (METBD 110
& 111)
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Assembly (METBD 111)
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Tolerancing (METBD 111)
Maximum and minimum dimension may be
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GD & T (METBD 111)
States maximum variation allowed.
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Fasteners (METBD 111)
External thread – I.e., broom handle, top of a
plastic pop bottle, bolt
Internal thread– I.e., lid for plastic pop bottle,
nut
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Thread Information (METBD 111)
External thread
Internal thread
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You are now ready for METBD 306/307
Computer-Aided-Design
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Let’s Step Back
Look at the METBD 110 Big Picture
How does this course fit into engineering?