01 Technical Drawing

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ICT 203: autoCAD & Basic 2D Drafting Skills


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Contents

Introduction to Technical Drawing

Sketching or Drawing

Manual Drafting Tools

Lines 9 Types of Lines

Drawing of Lines

Projectiony Orthographic or Multi-view projection

y Pictorial Drawing

Dimensioning

Sectioning


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Technical Drawing

It is a formal and precise way of communicatinginformation about the shape, size, features andprecision of physical objects.

A universal language of engineering used in thedesign process for solving problems, quickly and

accurately visualizing objects, and conductinganalysis.

A graphical representation of objects and structures.

It can be done by using freehand, mechanical, or

computer methods


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Which one is the Sketch and which one is the drawing?


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Sketching or Drawing

We will treat "sketching" and "drawing" as

one.

"Sketching" generally means freehand

drawing.

"Drawing" usually means using drawinginstruments, from compasses to computers

to bring precision to the drawings.


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Manual DraftingTools


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Lines

Generally, technical drawing is the expression of bodies

(or matters) by lines.

Pieces are composed of variable geometric component.

Sides and surfaces of these components are visible but

some of them can not be seen because they are behindthe back sides.

To obtain full and precise info about the piece, drawing

should be done by using variable lines (instead of using

same lines). Moreover, these lines should be drawn at

same thickness and shape by everyone.


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Type ofLines

[A] Continuous Line (Thick)y Surrounding and sides of the

matters, end of the screw

[B] Continuous Line (Thin)y Backside section line, measure

lines, guide lines, simplified axislines, at diagonal lines which areused to state plane surface, tostate the code of the places

[C] Freehand Line/ Zigzagy To state the place that limit

section and appearance ofmatter or to state the placeteared off.

y Zigzag line is used when freehand lines are drawn by Tool.

OR

VVVVVVVVVVVVVVVV


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Type ofLines

[D] Dash Line (thin)y Invisible surroundings and

sides of the matter

[E] Dash Line with Dot

(Thin)y Axis line of symmetrical

drawing

y In front of section plane

[F] Section Plane with

thick ends and thinmidpointsy To draw the traces at

section plane


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Type ofLines

[G] Dash Line with Point

(Thick)

y To state the place which

will be processed further (to

coat, to harden, etc.)

[H] Dash line with two

points (Thin)

y To show the surroundings

of neighbour pieces, tostate the secondary

position of moving pieces,

to state the center of gravity


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Drawing ofLines

Thickness of lines should be drawn according to thestandards.

At free hand drawing, Continuous - thick lines shouldbe drawn by B or 2B pencils while Continuous - thin

lines should be drawn byH

or 2H

pencils. Dash lines should be drawn at equal spaces andthickness. They should be 36 mm, or 0.8~1.5 mm


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Drawing ofLines

Dash lines with point should be drawnaccording to the size of the picture with belowmentioned sizes.


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Drawing ofLines

Intersected continuous lines should not be overflowed or

uncompleted at the intercept points and should have the same

thickness and corners should be sharp.

Minimum space of two parallel lines should not be less than two

times of the thick lines.


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Activity

Group yourselves.

5 persons per group.

Conceptualize your own Hotel / Resort /Condominium

On a 1 whole yellow paper, Write the

name of your establishment. Discuss the

rooms, amenities, and etc.

01 Technical Drawing

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