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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
http://images.google.es/imgres?imgurl=http://omega.ilce.edu.mx:3000/sites/ciencia/volumen3/ciencia3/139/img/car048.jpg&imgrefurl=http://omega.ilce.edu.mx:3000/sites/ciencia/volumen3/ciencia3/139/htm/sec_8.htm&h=208&w=163&sz=7&hl=es&start=4&tbnid=R5Ugb5adBbT30M:&tbnh=105&tbnw=82&prev=/images%3Fq%3Dgrafito%26gbv%3D2%26svnum%3D10%26hl%3Des8/12/2019 Drawing material 1
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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
http://images.google.es/imgres?imgurl=http://www.tycsapuebla.com/ima/clavo%2520tachuelon.jpg&imgrefurl=http://www.tycsapuebla.com/aceros.html&h=427&w=304&sz=37&hl=es&start=8&tbnid=HQK0ir3Y1d7CjM:&tbnh=126&tbnw=90&prev=/images%3Fq%3Dclavo%26gbv%3D2%26svnum%3D10%26hl%3Deshttp://images.google.es/imgres?imgurl=http://www.chm.seam.gov.py/gfx/iconos/i_pluma.gif&imgrefurl=http://www.chm.seam.gov.py/info_publicaciones.php&h=234&w=245&sz=12&hl=es&start=10&tbnid=3EHC7yH8DoQy1M:&tbnh=105&tbnw=110&prev=/images%3Fq%3Dpluma%26gbv%3D2%26svnum%3D10%26hl%3Des8/12/2019 Drawing material 1
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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
http://images.google.es/imgres?imgurl=http://www.penseurope.com/images/product/ven_rulers_large.jpg&imgrefurl=http://www.penseurope.com/es/products.asp%3Fprod%3DVEN-RULERS%26UID%3D%26headerCategory%3D&h=469&w=700&sz=32&hl=es&start=12&tbnid=Y0eCeuQThMSC6M:&tbnh=94&tbnw=140&prev=/images%3Fq%3Dregla%26gbv%3D2%26svnum%3D10%26hl%3Des%26sa%3DG8/12/2019 Drawing material 1
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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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2.2 DRAFT AND SKETCH
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
Page
41
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2.2 DRAFT AND SKETCH
Activity: draw a sketch of your homecupboard.
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2.2 DRAFT AND SKETCH
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
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