Computer Aided Engineering Drawing
‫الرسم الهندسي المعان بالحاسوب‬
CAD / CAD Engineering
Dr. Tahseen Fadhil Abbas
2012-2013
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Engineering Drawing
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Standards
Paper Sizes
The ISO most recommended paper sizes for technical
drawings are known as A-FORMATS. Other series, like
the B-Series, are of lesser importance. In the A-Format
series, the largest size is A0. The size of an A1 paper is
half the size of A0 while A2 is half the size of A1 and so
forth.. For technical drawings A4 is considered to be the
smallest paper size. Smaller-sized AFormat papers (i.e.
A5, A6, etc) are very rarely used for technical drawings.
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The A-Format Paper Sizes
When a format smaller than A4 is
needed, it is obtained by simply
halving A$ along its longer side. For
instance A5 has 210-mm as its
longer side and (297/2 = 148- mm)
as its shorter side.
.
Format A4 is exclusively used in an
upright position. The other formats
(which are lager in size than A4)
may be used in an upright position
or horizontal position.
.
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Format
Sheet mm
A0
841 X 1189
A1
594 X 841
A2
420 X 594
A3
297 X 420
A4
210 X 297
…….
……
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Title Block
In every engineering drawing, a Title Block is included at the
bottom (right-hand corner). The Title Blocks are locally
standardized but should be designed in such a way that it can
be easily understood. The information needed in any standard
Title Block is normally:
.
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Basic Instruments and Equipment
T-Square
This is one of the oldest drawing instruments that still finds wide spread use
both in the industry and in schools.
The size of a T-Square is determined by its blade length. Blade lengths of 60mm, 90-mm, 120- mm and 150-mm are common.
USES: The T-Square is used primarily as a guide for drawing horizontal parallel
lines.
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Set Square
Set Squares (SSs) are transparent, triangular-shaped drawing instruments that
are used with a T-Square for drawing vertical or inclined lines.
SSs contain angles most commonly used in technical drawing, i.e. 30, 45, 60
and 90.
The height/length of SSs is typically 15-cm, 20-cm, and 25-cm.
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Line Types
In Engineering Drawing, we make use of different lines and line styles to
convey the desired message. These lines differ in (i) thickness and (ii) style.
Typical uses of these lines are summarized below.
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Beginning
AutoCAD 2002
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Starting AutoCAD 2002
a) from the Windows ‘Start screen’ with a double left-click on the AutoCAD 2002 icon
b) b y s e l ec ti ng t he wi ndo ws tas k b ar s eque nc e ::
S t a r t - P r o g r a m s - A u t o C A D 2 0 0 2 - A u t o C A D 2 0 0 2
Both methods briefly display the AutoCAD 2002 logo and then the AutoCAD 2002 Today
screen/dialogue box as Fig,
.
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The Graphics Screen
The AutoCAD 2002 graphics screen displays the following:
1 The title bar
2 The ‘windows buttons’
3 The menu bar
4 The Standard toolbar
5 The Object Properties toolbar
6 The Windows taskbar
7 The Status bar
8 The Command prompt window area
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9 The coordinate system icon
10 The drawing area
11 The on-screen cursor
12 The grips
13 Scroll bars
14 The Layout tabs
15 The Modify toolbar
16 The Draw toolbar
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Drawing Line
Absolute, Incremental and Polar
‫رسم الخطوط باستخدام المدخالت المطلقة والتزايدية والقطبية‬
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COPY
‫استخدام امر النسخ‬
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PAPER SIZE
A4 ( 210 X 297 )
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Title Block
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Saving Drawings
In Class Ex1
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Home Work
Multi solid lines and hidden lines
with the title block
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THANK YOU
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