Overview of Graphics alias Drafting Print multiple handouts

Overview of Graphics (alias Drafting) Print multiple handouts on one page Select File – Print Edit the following selections to read: Select the OK button 1

Importance of Graphics Technical drawings graphically communicates a description of the part to be “manufactured” between the engineer and manufacturing/ marketing/ analytical group. n Also, it provides a vehicle for one’s thoughts to be visualized by another person n Universal language n 2

Drafting Standards n 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 Y 14 (ANSI Y 14). http: //www. ansi. org 3

Design & Graphic Communication n Types of Drawings – Artistic & Technical n 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 4

Objectives in Drafting n Legibility – must be able to read and interpret n Accuracy – valid and convey proper size or shape n Neatness – no smudges, rips, etc. . . n Speed – time is money 5

Types of Communication Sketching – still used, especially when designing a product n Board drawing – phasing out n CAD n – Computer-Aided-Design or Computer-Aided-Drafting n CADD – Computer-Aided-Design and Drafting 6

Goal: Working Drawings n A set of working drawings must: – Describe the parts – visually and dimensionally. – Show the parts assembled. – Identify all parts. – Specify standard parts. n A set of working drawings contains the following items: – Assembly drawing – Detail drawings – Parts list – Specifications 7

Shape Description 3 -dimensional (3 D) 2 -dimensional (2 D) 8

3 -Dimensional (METBD 110) 9

2 -Dimensional (METBD 110) 10

Most Common Views 11

Size Description Dimensions Notes 12

Dimensions (METBD 110) 13

Notes n (METBD 110) Written specifications: I. e. , – Note: All fillets and rounds are R. 13, unless otherwise specified. – Note: Material 1/8 thick. 14

Solid Modeling n (METBD 110) Pro/ENGINEER rest of semester 15

Additional Topics 16

Section View (METBD 110 & 111) 17

Auxiliary Views (METBD 110 & 111) 18

Assembly (METBD 111) 19

Tolerancing n (METBD 111) Maximum and minimum dimension may be 20

GD & T n (METBD 111) States maximum variation allowed. 21

Fasteners n (METBD 111) External thread – I. e. , broom handle, top of a plastic pop bottle, bolt n Internal thread – I. e. , lid for plastic pop bottle, nut 22

Thread Information n External thread n Internal thread (METBD 111) 23

You are now ready for METBD 306/307 Computer-Aided-Design 24

Let’s Step Back n n Look at the METBD 110 Big Picture How does this course fit into engineering? 25