01_01- Intro to EDG_502, Lettering, And Sketching

8/8/2019 01_01- Intro to EDG_502, Lettering, And Sketching

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ENDG 105-502 Fall 2010

Class 1.1Engineering Design Graphics -

Course Overview, Lettering, and Sketching


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Syllabus


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Course

Calendar


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Extra Credit

Near the end of every semester, a few students ask for

extra credit to improve their grade! My answer is always.NO. Study hard and do all the

work assigned and you should be O.K.

Keep all your tests, homework, etc. for proof and to use asstudy guides.


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Computer Log-in

Each person will receive a seven (7) digit number. That

will be your permanent user name for the classroom

computers.(all have the same first 5 digits -10502)

The last two are the numbers assigned by the instructor

examples. 01,10,15

Ctrl-Alt-Delete or Switch User

User name seven digit number(all semester)

Password password(initial password edg2010)

After you log in first time, you will be asked to change

your password. Select something you will remember

You will have some space on the computer to save work


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User Name 10502XX

Initial password - edg2010


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Learning Objectives

Demonstrate the proper form of lettering for

engineering drawings.

Use sketches to communicate.


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Importance ofTechnical Graphics

Problem Definition

Exploration of Ideas

Design

Analysis

Refinement and

Optimization

Implementation

What steps ofthe linear engineering

design process involve the use of

technical graphics?


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Problem Definition


Design

Analysis

Refinement and

Optimization

Implementation


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Problem Definition


Design

Analysis

Refinement and

Optimization

Implementation


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Problem Definition


Design

Analysis

Refinement and

Optimization

Implementation


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Problem Definition


Design

Analysis

Refinement and

Optimization

Implementation


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Importance ofEngineering Graphics

Problem Definition


Design

Analysis

Refinement and

Optimization

Implementation


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Importance ofEngineering Graphics

Communicating Technical Information

Quickly and Accurately Visualizing Objects

Solving Problems

Conducting Analysis


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Major Areas in Engineering Graphics

Visualization

Ability to mentally control visual information

Graphics Theory

Geometry and projection techniques

Standards and Conventions

Sets of rules that govern how drawings are made

Tools devices (traditional and computer) used to create drawings

Applications

Various uses for technical graphics in engineering design


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Questions

What is the difference between Standardand

Convention?

Can you think of some examples?

Why do we need Standards and Conventions?


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Standards and Conventions

Standard

formal document that institutes a uniform method to perform an action or

defines a criterion for a product. Standards are defined by organizations

such as ANSI (American National Standards Institute) responsible for

regulating many engineering standards used in the US.

Convention

methods and criteria used so extensively that they become dominant and

generally accepted and adopted by the public. They are also known as

industry standards or de facto standards. There are no organizations or

formal documents that define conventions. These conventions can differbetween industries or even firms within the same industry.

In the United States, the Y series of the ANSI standards regulate

engineering drawings


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Engineering Drawing Tools

Traditional Tools are still important, especially for

sketching.

Computer-Aided Design (CAD) systems can be used

for most drawing and modeling requirements

We will start with traditional tools and use CAD later

in the semester.


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Engineering Drawing ToolsPencils

Mechanical pencils will give

more consistent results that

traditional wooden ones

If you use a wooden pencil,

rotate it as you draw to keep

the wear even on the point

Several lead hardnesses

(7B,, 2B, B, HB, H, 2H, 9H)

Most often used: H, 2H, 4H


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Engineering Drawing ToolsPaper

Wide variety of paper choices and sizes

(including a napkin you could draw on

during lunch)

Plain paper with no lines offers the

highest degree of flexibility

If you need guidance you can use grid

paper (square grid and isometric grid)

Letter size (8 X 11) is the most

common


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Engineering Drawing ToolsEraser

It should be used to correct

mistakes in a line, not to make

changes in a design

The eraser on the end of the pencil

should be sufficient

Separate erasers of multiple sizes

and shapes are available

Gum erasers leave less residue

when used


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Engineering Drawing ToolsOther Tools

Pencil, paper, and eraser should be ALL

you need to sketch

Tools like T-Squares and Triangles can:

slow you down

add a level of accuracy not needed in

early stages of a design

restrict the types of forms explored

They are not always available!

PRACTICE will allow you to draw lines

and circles good enough for sketches

without these aids.


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Question

How many of you have parents/

grandparents/aunts/uncles, etc. who are engineers?

Any comments about the way they think or

communicate? Anything peculiar about the way they

write or draw?


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Lettering

Lettering is a part of sketching and drawing

It will seem tedious but developing good technique is important

Lettering styles differ based on the function of the document.

The following figure illustrates a lettering style used for diplomas, but

would be too hard to read for engineering drawings.


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Lettering

The style of engineering lettering we will use in this course is Single

Stroke Gothic Lettering.

An example of each characters is shown below.

Notice that only capital letters are used, since we will use only capital

letters on drawings.

Each letter should be 1/8 in height.


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Numerals

Numerals should also be 1/8 in height.

Fractions should be twice normal letter height, but each numeral

(numerator and denominator) should be shorter than 1/8 toallow space for the vinculum (horizontal line which separates the

numerals).


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Lettering Techniques

Some letters are wider than others, so using equal spacing between

the letters would make the text appear confusing.

Hold the pencil between the thumb,

forefinger, and second finger withoutgripping it too tightly. The most

ergonomically efficient position to hold

the pencil is at a 60 angle with the

paper.


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EngineeringSketching

Engineering sketches are black and white line

drawings with notations expressing design intent.

They should always be signed and dated to verify

ownership.

First and foremost, sketching is a form of

COMMUNICATION.


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EngineeringSketching

What is the difference between these two sketches?


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Sketching

Emphasis will be on sketching geometric figures to represent

features of objects.

Medium grade pencils work best for sketching.

All lines should be dark enough to standout from the page.

Pure sketching does not require the use of any drawing

instruments.

Try to maintain proportion between features or objects

Should be the first step of any design.


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Use very light construction lines.

Box in the rough outline of the object.

Darken only the lines you wish to keep.

Clean up the edges and rough spots.

Sketching Techniques


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When sketching LINES,

keep your eye on the endpoint.

If necessary, break long lines into short segments by

marking the midpoint

Make quick light strokes initially. Darken only the lines you want.

When sketching CIRCLES and ELLIPSES,

break large arcs/circles into small

segments.

Sketch a light square/rectangle.

Lightly sketch in diagonals.

Mark contact points on square/rectangle.

Rotate the paper for each segment.


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High QualitySketch


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Chapter 2 in your graphics textbook gives good tips

on how to produce sketches.

You should practice the sketching exercises at the

end of the chapter to get more comfortable with

sketching.


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Uses ofSketching

Some sketching is to illustrate definite concepts.

Some sketching is done as an aid to clearer thinking.

Some sketching is done to illustrate actual objects.

It is very easy to fall into the trap of saying, T

hissketch is just for my use, it does not have to be neat.


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In- class assignment 1.1

Situation Saturday in the Fall, there is a football

game, you have just come out of the CVLB building

after finishing up some graphics homework, you run

into some fans of the opposing football team who ask

you for directions to Kyle Field. Sketch a map showing how to get from the CVLB

building to Kyle Field.(Use SINGLE STROKE

GOTHIC LETTERING AND NUMBERS ALL CAPS

for any text) Make sure your NAME(last name first), todays date,

and section number are on the sketch (SINGLE

STROKE GOTHIC LETTERING AND NUMBERS

ALL CAPS for text)


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Assignment continued

Trade sketches with a classmate to compare and

discuss.

Return the sketches.

Turn in your sketch at the end of class.


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A look ahead

Objects are three

dimensional and require

special care in order to be

represented accurately on a

two dimensional sheet ofpaper.

Special methods have been

developed to deal with the

projection of a 3D objectonto a 2D page.


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TaxonomyofProjections


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Individual Homework Assignment 1.1 Complete the Lettering exercise on page 14 of the textbook.

Make two copies of each letter, number and fraction, and two

copies of each sentence (use the guidelines provided) Fill out

the title block using Single Stroke Gothic letters and

numbers(1/8 tall and all caps for text).(last name first)

Complete Problems 1. (Bracket) and 4. (Tee connection) onpage 12 of the textbook(note use a separate sheet for each

problem). Use landscape paper orientation and Sketch the

object as large as possible on the sheet of paper. Make sure

your NAME(last name first), date, and section number are on

the sketch (SINGLE STROKE GOTHIC LETTERING AND

NUMBERS ALL CAPS for text) All slots and holes go all the

way through the objects (except for the Tee connection, the

horizontal and vertical holes intersect).

Staple all three sheets together and turn in one week from today

at the beginning of class.

Documents

01_01- Intro to EDG_502, Lettering, And Sketching