Drawing material 1º

8/12/2019 Drawing material 1

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Technical Drawing Instruments


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What are we going to see in this unit? 2.1 Drawing tools and how to use them

2.2 Drafts and sketches

Unit 1.Technical Drawing


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1.1 Drawing materials and instruments

Paper Paper is made of cellulose that is obtained from trees

The paper size that we use is A4 . It is the result of

dividing 1 m2 (A0) four times by half the longest side.


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A pencil has a lead covered with wood. Thelead is made with graphite and clay

clay

Graphite

Lead

Wood cover

Pencil
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The more clay it contains the harder the lead willbe. We use letter H for hard pencils and letterB for soft ones.

Hard: HSoft: B

Very hard Hard Medium Soft Very soft

6H 5H 4H 3H 2H H HB B 2B 3B 4B 5B 6B

less clayMore clay

Technique draw Artistic draw

Pencil hardness
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They hold a graphite lead. They can be used for

technical drawing (if used )with a soft lead.

ERASERS

Erasers are made of rubber,

They absorb graphite and erase it.

MECHANICAL PENCILS


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It is a precision tool that makes it possible tomeasure and to transfer a distance.

THE RULER
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TRIANGULAR SET SQUARE

A set square is a tool for drawing parallel lines,horizontals, verticals, perpendiculars and and forobtaining angles.

There are 2 types of triangular set squares

45 degree 60 degree


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Parallel lines

Parallel lines are lines that never

meet.


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Parallel lines: 1st wayHorizontals, Verticals & Obliques

Activity: Draw the set squares in your notebook as you can see them in both

positions

horizontals

v

e

r

t

ic

a

l

s


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How to draw horizontal and parallel lineswith the set square 2nd WAY

Horizontal:Vertical:

Activity: Draw the set squares in your notebook as you can see

them in both positions


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Perpendicular lines

Perpendicular lines are lines that

form 90 degrees.

90


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How to draw perpendicular lines with theset square

Horizontal:Vertical:


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It is used fordrawingcircles andangles

Advice: sharpen the lead tip

by rubbing it on a fingernail

file

The Compass


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2.2 DRAFT AND SKETCH

DRAFT: Itis a free hand drawing (just with a pencil). Weshow an idea or object without totally defining it.


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The sketch: Itis a free hand drawing too, but itincludes the measures, therefore it shows theprecise size and a shape similar to the final

drawing.

measure

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41


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Activity: draw a sketch of your homecupboard.


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the Sketch


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Vocabulary

Paper size Cellulose Clay Graphite Lead Hard pencil

Soft pencil Eraser Technical pencil Sixty degree triangle Forty-five degree triangle Sketch Draft Free hand drawing Measure Length/ Long Height/ high Width/ wide

Drawing material 1º

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