Unit 1: Introduction to Drafting (Chapter1: World Wide

Technical Drawing with Engineering Graphics, 15th edition

Giesecke, Hill, Spencer, Dygdon, Novak, Lockhart, Goodman 1

DFTG-1305 Technical Drafting

Instructor: Jimmy Nhan

Unit 1: Introduction to Drafting

(Chapter1: World Wide Graphics)



OBJECTIVES

1. Professions that use technical drawings.

2. Identify three purposes for technical drawings.

5. Explain why standards are important.



Manual drawing? Why?

John McRae, Director of Drafting Department at MicroTron

Engineering says:

• A lot technicians with CADD skills but none of them has

deep knowledge of how to make technical drawings with

instruments (manual drafting).

• A lot engineering companies still use traditional drafting to

revise existing drawings

And my experiences, manual drafting still provides a solid foundation for a draftsperson: To express ideas, sketch replacement parts, joist downinitial inventions, explain concepts to customer/co-worker, and many more….



Engineers in all fields

Architectures

Few sample Professions that use technical

drawings

Constructions

Landscape



UNDERSTANDING THE

ROLE OF TECHNICAL DRAWINGSTechnical drawings serve one of three purposes:

• Visualization

• Communication

• Documentation

(Courtesy of Woods Power-Grip Co., Inc.)

(Courtesy of Dynojet Research, Inc.)

(Project developed and created by Philips Design.)





Unit 3: Lettering

(Chapter2: Layouts and Lettering)

DFTG-1305 Technical Drafting

Instructor: Jimmy Nhan



OBJECTIVES

1. Lettering

2. Fill in a standard title block with the appropriate information.

3. Lay out a drawing sheet.



Drawing Vocabulary

• Drawing Lines

• Lettering

• Measurement Systems

• Scale

• Title Blocks

A B C A B C

Title Block

mmInch



LETTERINGLettered text is often necessary to completely describe an object or to provide

detailed specifications. Lettering should be legible, be easy to create, and use styles

acceptable for traditional drawing and CAD drawing.

Engineering drawings use single-stroke

sans serif letters because they are highly

legible and quick to draw.

Sans serif means without serifs, or spurs



LETTERING STANDARDS

• Most hand-drawn notes use lettering

about 3 mm (1/8") high.

• CAD notes are set using the

keyboard and sized to be in the

range of 3 mm (1/8") tall according

to the plotted size of the drawing.

• CAD drawings typically use a

Gothic (sans serif) lettering style but

often use a Roman (serif) style for

titles. When adding lettering to a CAD

drawing, a good rule of thumb is not

to use more than two fonts within the

same drawing.

Examples of Lettering Using CAD



Vertical

Capital

Letters

and

NumeralsThe proportions

of vertical capital

letters and numbers

are shown



Inclined

Capital

Letters

and

Numerals

Inclined (italic) capital

letters and numerals,

are similar to vertical

characters, except for

the slope. The slope of

the letters is about 68°

from the horizontal.



FRACTIONS

Do’s & Don’t

• Never let numerals touch the fraction bar.

• Center the denominator under the numerator.

• Avoid using an inclined fraction bar, except when lettering

in a narrow space, as in a parts list.

• Make the fraction bar slightly longer than the widest part

of the fraction.



USING GUIDELINES

Use extremely light horizontal guidelines to keep letter height uniform…

For even freehand letters:

• Use 1/8" gridded paper for drawing to make lettering easy.

• Use a scale and set off a series of spaces, making both the

letters and the spaces between lines of letters 1/8" high.

• Use a guideline template like the Berol Rapidesign 925

• For whole numbers and fractions, draw five equally

spaced guidelines.



SPACING OF LETTERS AND WORDS

Spacing between WordsSpace letters closely within words to make

each word a compact unit, but space words

well enough apart to clearly separate them

from adjacent words.

Spacing between RowsBe sure to leave space between rows of lettering,

usually equal to the letter height.

Spacing between LettersUniform spacing between letters is done by

eye. Contrary to what might seem logical,

putting equal distances from letter to letter

causes them to appear unequally spaced.



LETTERING FOR TITLES

In most cases, the title and

related information are lettered

in title boxes or title strips

When lettering by hand, arrange

the title symmetrically

about an imaginary centerline

Documents

Unit 1: Introduction to Drafting (Chapter1: World Wide