Computer-Aided Drafting (CAD) PDF

(Computer – Aided Drafting FREDERICK MARK L. MARZO, PAE Instructor  People in manufacturing understand the importance of technical drawings. Good technical drawings can often reduce the risk of significant delays in production as well as guard against the danger of ending up with a...

(Computer – Aided Drafting FREDERICK MARK L. MARZO, PAE Instructor  People in manufacturing understand the importance of technical drawings. Good technical drawings can often reduce the risk of significant delays in production as well as guard against the danger of ending up with an inaccurate gear. Technical drawings must be accurate, and drafted according to industry standards. Drawing is the principal/universal language that everyone could understand. Drawing or illustrating techniques vary in style. However, a standard method of drawing is observed in making industry grade illustrations for constructions, manufacture and architectural purposes. This is called Computer-Aided Drafting.  In this modern age, Technical Drafting is produced with the use of different computer aided design software such as : AutoCAD, Solid Works, Edraw. These are commercial software that are generally available in the market but there are also similar software available for free like Google SketchUp. CAD/CADD  CAD/CADD Computer Aided Drafting Computer Aided Design Computer Aided Design and Drafting  CAD/CADD Is a computer technology that designs a product and documents the design’s process. It may facilitate the manufacturing process by transferring detailed diagrams of a product’s materials, processes, tolerances and dimensions with specific conventions for the product in question. It can be used to produce either two-dimensional (2D) or three-dimensional (3D) diagrams, which can then when rotated to be viewed from any angle, even from the inside looking out. A special printer or plotter is usually required for printing professional design rendering It is the use of computer systems to assist in the creation, modification, analysis, or optimization of a design. Computer aided drafting describes the process of creating a technical drawing with the use of computer software. CAD software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation and to create a database for manufacturing. CAD output is often in the form of electronic files for print or machining operations. CAD software uses either vector based graphics to depict the objects of traditional drafting, or may also produce raster graphics showing the overall appearance of designed objects. CAD/CADD can be used as follows:  CAD/CADD can be used as follows: 1. To produce detailed engineering designs through 3 – D and 2 – D drawings of the physical components of manufactured products.  CAD/CADD can be used as follows: 1. To produce detailed engineering designs through 3 – D and 2 – D drawings of the physical components of manufactured products. 2. To create conceptual designs, product layout, strength and dynamic analysis of assembly and the manufacturing process themselves.  CAD/CADD can be used as follows: 1. To produce detailed engineering designs through 3 – D and 2 – D drawings of the physical components of manufactured products. 2. To create conceptual designs, product layout, strength and dynamic analysis of assembly and the manufacturing process themselves. 3. To prepare environmental reports, in which computer – aided designs are used in photographs to produce rendering of the appearance when the new structure are built. Some Software use in Computer Aided Drafting:  Some Software use in Computer Aided Drafting: Google Sketch Up Autodesk AutoCAD Solid Works Google Sketch Up AutoCAD AutoCAD is a commercial product made by Autodesk. It is one of the most popular computer-aided drafting applications on the market today. You can use it to design plans for residential homes and complex drawings such as paper-converting machines and circuit boards. The AutoCAD Interface Info Workspac Space e Cursor View Menu Control Universal Visual Style Coordinate Control System (UCS) Comman d Line Status Bar Command Line Windows The Command Line window by default is displayed between the drawing window and the status bar area. If you don’t like its position, you can dock it above or along the left or right side of the drawing window. The Command Line window plays a key role in inputting commands, options, and values to create and modify objects. It also displays command prompts and messages to let you know what AutoCAD is waiting for. Text window It displays a running history of the commands and options that you previously entered in the Command Line window or at the dynamic input tooltip. You won’t need the Text window very often, but if you need to see what you did a few commands ago, press F2 to bring up the Text window. Status Bar It allows you to quickly access drafting settings and other settings that are used for some of the features. Most of the settings on the status bar allow you to toggle drafting settings on or off without opening a dialog box or remembering a shortcut key combination. Also, you can right-click most buttons to access options that allow you to change the behavior of the drafting settings. Drawing lines with the Line Command 1. Move the graphics cursor to the first icon in the Draw panel. This icon is the Line icon (Fig 2-1). Note that a brief description of the Line command appears next to the cursor Drawing lines with the Line Command 2. Select the icon by clicking once with the left-mouse- button, which will activate the Line command. Drawing lines with the Line Command 3. Near the bottom of the AutoCAD drawing screen, LINE Specify first point:” is displayed (Fig 2-2) 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. You can treat the graphics window as if it is a piece of paper and you are using the graphics cursor as if it is a pencil with which to draw. Making of a line After selecting the line icon, Select any point in the drawing window using the left click of the mouse, “this will be the first point of the line”, then gently move the mouse to the desired location of the second point. After the selection of the position of the second point click the left click of the mouse, ”this point will be the second point of the Making of a line When the line is made, the command line is requiring another next point. “if the desired line was finished, hit the “enter key” of the keyboard to stop the “line command”. Making of a line When the line is made, the command line is requiring another next point. “if the desired line was finished, hit the “enter key” of the keyboard to stop the “line command”. Then the computer is free from any command Making of a line Then try to make a 5 point star in freehand using line command. Do not be overly concerned with the actual size or the accuracy of your freehand sketch. This exercise aims to give you a feel of the AutoCAD® user interface. Other Method of making a line Type “L” then enter. Select the first point of the line - Left click anywhere in the drawing window. - or type the coordinate of the first point. Project the cursor to the desired location where the line will lie and type the dimension of the line then enter. or used the polar coordinates (making use of angle). Example, if the line will lie at 5 units away with angle at 72 degrees (type “ @5