01 technical drawing
TRANSCRIPT
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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.