7- Layers and properties 8- Modeling 9- Geometry Introduction What is CAD? Computer Aided Design (CAD) is simply, design and drafting with the aid of a computer. Design is creating a real product from an idea. Drafting is the production of the drawings that are used to document a design. CAD can be used to create 2D or 3D computer models. A CAD drawing is a file that consists of numeric data in binary form that will be saved onto a disk.
Why use AutoCAD? AutoCAD is a computer aided design software developed by Autodesk Inc. AutoCAD was first introduced in 1982. By the year 2000, it is estimated that there were over 4 million AutoCAD users worldwide. What this means to you is that many employers are in need of AutoCAD operators. In addition, learning AutoCAD will give you the basics for learning other CAD packages because many commands, terms and concepts are used universally. Starting Up AutoCAD 1- open AutoCAD icon from desktop
Note that AutoCAD automatically assigns generic names, Drawing X, as new drawings are created. In our example, AutoCAD opened the graphics window using the default system units and assigned the drawing name Drawing1. 2. If necessary, click on the down-arrow in the Quick Access bar and select Show Menu to display the AutoCAD Menu Bar. The Menu Bar provides access to all AutoCAD commands Drawing Units Setup Every object we construct in a CAD system is measured in units. We should determine the system of units within the CAD system before creating the first geometric entities.
Drawing Lines with the LINE Command Move the graphics cursor to the first icon in the Draw panel. This icon is the Line icon. Note that a brief description of the Line command appears next to the cursor. Select the icon by clicking once with the left mouse-button, which will activate the Line command. In the command prompt area, near the bottom of the AutoCAD drawing screen, the message _line Specify first point: is displayed. AutoCAD expects us to identify the
starting location of a straight line. Move the graphics cursor inside the graphics window and watch the display of the coordinates of the graphics cursor at the bottom of the AutoCAD drawing screen. The three numbers represent the location of the cursor in the X, Y, and Z directions. We can treat the graphics window as if it was a piece of paper and we are using the graphics cursor as if it were a pencil with which to draw. Coordinates of cursor We will create a freehand sketch of a five point star using the Line command. Do not be overly concerned with the actual size or accuracy of your freehand sketch
Notice that the Line command remains activated even after we connected the last segment of the line to the starting point (point 1) of our sketch. Inside the graphics window, click once with the right-mouse-button and a popup menu appears on the screen. . Select Enter with the left-mouse-button to end the Line command. (This is equivalent to hitting the [ENTER] key on the keyboard.) . Move the cursor near point 2 and point 3, and estimate the length of the horizontal line by watching the displayed coordinates for each point.
Visual Reference GRID and SNAP MODE options can be used to get a visual reference as to the size of objects and learn to restrict the movement of the cursor to a set increment on the screen. The GRID and SNAP MODE options can be turned ON or OFF through the Status Bar. The Status Bar area is located at the bottom left of the AutoCAD drawing screen, next to the cursor coordinates.
Status bar GRID ON 1. Left-click the GRID button in the Status Bar to turn ON the GRID DISPLAY option. (Notice in the command prompt area, the message is also displayed.) The GRID option creates a pattern of lines that extends over an area on the screen. Using the grid is similar to placing a sheet of grid paper under a drawing. The grid helps you align objects and visualize the distance
between them SNAP MODE ON 1. Left-click the SNAP MODE button in the Status Bar to turn ON the SNAP option. 2. Move the cursor inside the graphics window, and move the cursor diagonally on the screen. Observe the movement of the cursor and watch the coordinates display at the bottom of the screen.
The SNAP option controls an invisible rectangular grid that restricts cursor movement to specified intervals. When SNAP mode is on, the screen cursor and all input coordinates are snapped to the nearest point on the grid. Using the ERASE Command Pick Erase in the Modify toolbar. (The icon is a picture of an eraser at the end
of a pencil.) The message Select objects is displayed in the command prompt area and AutoCAD awaits us to select the objects to erase. Select any two lines on the screen; the selected lines are displayed as dashed lines as shown in the figure below. Click ENTER to erase or Space dash Creating Circles In the Draw toolbar, click on the little triangle below the circle icon. Note that the little triangle indicates additional options are available. In the option list, select: [Center, Diameter]
Notice the different options available under the circle submenu: Center, Radius: Draws a circle based on a center point and a radius. Center, Diameter: Draws a circle based on a center point and a diameter. 2 Points: Draws a circle based on two endpoints of the diameter. 3 Points: Draws a circle based on three points on the circumference. TTRTangent, Tangent, Radius: Draws a circle with a specified radius tangent to two objects. TTTTangent, Tangent, Tangent: Draws a circle tangent to three objects.
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