Computer Aided Drafting PDF

COMPUTER-AIDED DRAFTING CAD TOPIC 2: DRAWING AND EDITING COMMANDS Introduction: Drawing tool in AutoCAD helps you in creating and constructing the geometrical shapes. Basically all drawing models are created by combination...

COMPUTER-AIDED DRAFTING CAD TOPIC 2: DRAWING AND EDITING COMMANDS Introduction: Drawing tool in AutoCAD helps you in creating and constructing the geometrical shapes. Basically all drawing models are created by combination of different geometrical shapes. In this lesson, you will learn how to execute the drawing of different basic drawing tools such as: lines, poly lines, circles, rectangles, ellipse and arcs. Lines and Polylines The difference between the line and polyline is that the lines created in the polyline command are interconnected in every segment made while line command each segment created are separate with each other. Showed in figure 2.1 the difference of the two. When selecting the figure made in the polyline command (left) just a click to highlight the lines while the lines made with line command (right) all the segments will be clicked to highlight the object created. Although, the execution of this commands are the same. Fig 2.1. Different rectangles made with polyline (left) and line (right) commands. 11  COMPUTER-AIDED DRAFTING CAD Directions in using Line/Polyline command. A. Creating a line/polyline using the mouse. 1. Move the graphics cursor to the first icon in the Draw panel. This icon is the Line icon (Fig 2.2). Note that a brief description of the Line command appears next to the cursor. 2. Select the icon by clicking once with the left- mouse-button, which will activate the Line command. 3. At the command line, the computer displayed “LINE specify first point”. AutoCAD expects us to determine the location of the first point of the line. Figure 2.2 Move the graphic cursor anywhere in the drawing window and select area for the first point then click the “Left click of the mouse”. 4. Again, at the command line, the computer displayed “Specify next point”. AutoCAD expects us to determine the other point of the line. Move the graphic cursor to the desired location of the second point of the line. 5. When the line is created, the AutoCAD will continually ask for another end point. Thus, when the desired line is finished, click the “right click of the mouse” (a pop up menu will appear) then click enter to stop the Line/Polyline command or press the “enter” key in the keyboard. B. Creating a line/Polyline using relative rectangular coordinate entry for the first point and relative polar coordinate entry for the other points. 1. Type “L” (shortcut key for Line) or “PL” (shortcut key for Polyline) then enter. 2. For the first point, type @6,0 then enter. (the relative rectangular coordinate choose the first point which is 6 unit from the x-axis and 0 units from the y-axis). 3. Type @10