AutoCad2008 Lec1,Lec2,Lec3
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Transcript of AutoCad2008 Lec1,Lec2,Lec3
GH AutoCAD2008 Lectures 2
Definitions:
AutoCAD: is a Microsoft Windows-based suite of CAD “computer aided design” software products for 2- and 3-dimensional design and drafting, developed by Autodesk.
Bit : A binary digit the smallest unit of information recognized by a computer
Byte: A unit of computer memory consisting of 8 bit. Hard Copy: A paper copy of a finished drawing created on a computer. Personal Computer PC: A microcomputer unit usually consisting of a
CPU, a keyboard, and a monitor. Pixel: A dot of color that appears on a computer screen. Program: A group of written instructions for a computer logically
arranged to perform a task. Write protect: a safety feature which prevents the loss of data from
storage disks.
GH AutoCAD2008 Lectures 3
Computer system Hardware and Software:All computer system consists of similar hardware devices and
software components. In brief hardware refers to physical components that a computer made of. A computer, as we generally think of it , is not an individual device, but a system of devices , each device plays its own part . A typical computer system consist of the following major components:
1. The central processing unit-CPU (it is the brain of PC)2. Main Memory3. Secondary storage4. Input devices5. Output devices
GH AutoCAD2008 Lectures 5
System Requirements Operating System: Microsoft Windows® XP Professional,
Service Pack 2. Processor: Pentium III or IV (Pentium IV recommended) 800
MHz. RAM: 512 MB (recommended). Graphics card: 1024 x 768 VGA with True Color (minimum),
Open GL®-compatible 3D video card (optional). Hard disk: Installation 750 MB.
Before you install your product on a stand-alone computer, make sure that your computer meets the minimum system requirements. If your system does not meet the system requirements, many problems can occur, both within AutoCAD and at the operating system level.
GH AutoCAD2008 Lectures 7
AutoCAD menus:
Standard Annotation toolbar docked at the top of the AutoCAD window under the Menu bar.
GH AutoCAD2008 Lectures 9
Draw Geometric Objects(2D)
In general, you draw objects by specifying points with the pointing device or by entering coordinate values on the command line.
GH AutoCAD2008 Lectures 10
Lines: Lines are probably the most simple of AutoCAD objects. To
use Cartesian coordinates to specify a point, enter an X value and a Y value separated by a comma (X,Y). The X value is the positive or negative distance, in units, along the horizontal axis. The Y value is the positive or negative distance, in units, along the vertical axis.
GH AutoCAD2008 Lectures 11
Lines:
•You can use absolute or relative polar coordinates (distance and angle) to locate points when creating objects. To use polar coordinates to specify a point, enter a distance and an angle separated by an angle bracket (<).
GH AutoCAD2008 Lectures 12
Erase Command:
Removes objects from a drawing by click this icon in the modifying object area or click on the object the press DEL button on the Keyboard
Change View commands:
PAN real time: Moves the view in the current view port. ZOOM Real time: Zooms to increase or decrease the
apparent size of objects in the current view port. ZOOM Window : Zooms to increase or decrease the
apparent size of objects in the current view port. ZOOM Previous: Restore the previous Zoom
GH AutoCAD2008 Lectures 13
Exercise(1):
Try to draw this figure using Line then Polyline … what do you notes?
GH AutoCAD2008 Lectures 19
Drawing Time is Important:
This drawing is normally cost 12min for drawing, then it takes 8min to put dimensions to it the total time is equal 20min. So how mush time you spend to draw this figure?
GH AutoCAD2008 Lectures 20
How you can execute commands:
Using drawing object area.
Using menu bar area.
Using command area.
GH AutoCAD2008 Lectures 21
Basic ideas for drawing:
Draw rectangle greater than your dimension (x,y) of your drawing.
In the zoom field click on zoom extents.
You can draw now comfortably.
GH AutoCAD2008 Lectures 22
SELECTING OBJECTS: By click on the exact
object that we want to select and repeat this procedure until we finish.
By using blue window that appear when we star select from the left corner to the right corner.
By using green window that appear when we star select from the right corner to the left corner.
GH AutoCAD2008 Lectures 23
Circle:
Command: _circle Specify center point for circle or [3P/2P/Ttr (tan tan radius)]:
GH AutoCAD2008 Lectures 24
Arc:
Command: _arc Specify start point of arc or [Center]: 10,10
Specify second point of arc or [Center/End]: 12,12
Specify end point of arc: 12,9
P(12,12)
P(10,10)
P(12,9)
GH AutoCAD2008 Lectures 25
Modifying Commands: Copy command: Copies objects a specified
distance in a specified direction
Move command: Moves objects a specified distance in a specified direction
“A”
Drawing
“B”
Selecting
“C”
Base Point
“D”
Target Point
GH AutoCAD2008 Lectures 26
Dimension Style:
Right click on the standard menu.
Click on ACAD option. Then activate Dimension.
Click on Dimension Style Manager.
GH AutoCAD2008 Lectures 29
You must change your dimension style for every drawing to make it easy to read from the costumer.
Before Modification
After Modification
GH AutoCAD2008 Lectures 36
Modifying Commands: Mirror Command: Creates a mirror image copy of objects
GH AutoCAD2008 Lectures 37
OFFSET: CREATES CONCENTRIC CIRCLES, PARALLEL LINES, AND PARALLEL CURVES, OFFSET creates a new object at a specified distance from an existing object or through a specified point.
GH AutoCAD2008 Lectures 38
Trim & Extend Command:
Trim Command: Trims objects at a cutting edge defined by other objects
GH AutoCAD2008 Lectures 41
Drawing Polygon: Use POLYGON to create closed poly lines with between 3
and 1,024 equal-length sides. The following illustrations show polygons created using three methods. In each case, two points are specified.
GH AutoCAD2008 Lectures 42
Command line: polygon Enter number of sides <8>: Specify center of polygon or [Edge]: Enter an option [Inscribed in
circle/Circumscribed about circle] <current>: Specify radius of circle:50