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?