what is meant by CAD?
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CAD/CAM (are used frequently)\nCAD: Comuter Aided Designing\nCAM: Computer Aided Manufacutring\n\nIts software used to design stuff, (used mostly by manufacturer)
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You can download free trial software from Autodesk, the publishers of AutoCAD.\nhttp://www.autodesk.com
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Autocad is probably the most popular.  It has many versions including LT and 2006.  It's probably the most user friendly also.  One that is more advanced is called Rhino.  It uses four windows showing every dimension in different views.  There are others, but these are the most popular and user friendly
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ECAD is I presume: Electronic Computer Aided Design. \nBest, use AUTOCAD. Its drawing designs in a comp. Its mostly used by architects. For Eg. Drawing a blue print for\nyour house etc.
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You will not legally be able to download a version of Auto CAD without paying for it. You can go to their websites and get a trial version I believe.
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This article looks like a good starting place:\n\nhttp://en.wikipedia.org/wiki/CAD/CAM_in_the_footwear_industry
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CNC is Computer Numerical Control and NC is Numerical Control. CNC is very cost effective\n\nCNC is the most prevalent in industry, today. Typically, the CAD data base is downloaded to a machine readable file. The Programmer/Machinist programs the machine tool to following the exact configuration of the part. The Programmer must select the proper cutting tools, speeds and feeds of the cutters and cutting lubricants to be used.\n\nCNC machining provides virtually defect parts and produces finished parts in a fraction of the time as compared to other processes.\n\nHowever, the initial set time and costs are high, but, the high volume production yields the lowest cost possible.\n\nHope this helps.\n\nMav
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wow, computers draw in 3d as well as anyone in first year drafting did before computers. really, in 9th grade drafting we did many projects including assembly drawings in opaque. 1969 I believe.
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Since I am an old salt about this, hand drawing (“Board Drafting as it is called”) takes skill and some artistic abilities.  CAD is done by some one that just can hit buttons.  Board is fast in design, but to change the design and reprint the idea, CAD is where it rules, it is fast and easy to change.  The real reason to have drafting personnel learn the board techniques are to understand some of the “Historic” reason for the layouts of drawings and plans.
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If you are looking for the CAD software, you can visit their website at: http://www.cad-europe.com/index_en.htm
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(briefly)To utilize a software to make drawings for engineered parts, machines, construction dwgs. etc. This is an evolving process from the engineer to mechanical/architectural contractors to add definition to the design and to utilize the known means of symbols/abbreviations to parlay communication to be used for bidding, approval, detailing, and installing.
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its a design software for lay outting the PCB designs. \nu had mentioned its version 14.2\nthis software will be just like the CAD(mechanical design softwares)\nit is the modified version of tat...
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Try downloading a free 45-day, fully functional,  trial copy of Delta Cad 2D software. If you like it (it takes only a few days to get the knack of using it) a licensed  copy is only $39.95.\n\nIt has almost NO bells and whistles, but it is very carefully designed. Once you start using it and begin to realize the logic behind the design it just gets better and better and easier and easier to use.\n\n I've been using a licensed copy of version 5.0 for several years and plan to upgrade to version 6.0 later this week. It works so well for me that I didn't even know an upgrade was available until I went to their website to get the URL to answer your question!
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Using a search engine like Yahoo would be a great place to start. But here's a couple of sites to get you started:\n\n1: http://en.wikipedia.org/wiki/Computer-aided_design\n\n2: http://www-staff.lboro.ac.uk/~cdspk/d&t_cad_pages/mod_level1/intro.htm
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Learn AutoCAD, Mechanical Desktop etc.
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ACAD14 refers to a sophisticated "Computer Assisted Design" (CAD) software package called AutoCAD, version 14.  Version 14 is generally considered to be very outdated (1998), yet still viable.\n\nIn essence, CAD software uses computers to create drawings to communicate how something is to be made.  Lines, arcs circles and text, in Euclidian Geometry and Trigonometry, are combined by the designer/drafter for creation of documents for buildings, highways and bridges; vehicles, boats and aircraft; and any array of manufactured products.\n\nCAD files, just as they can "drive" a printer, are also used to drive an incredible variety of robotic machines - even sewing machines.  Today, often CAD is used to create 3D computer models, and is sometimes used for movies and gaming.\n\nA.E.C. refers to the Architecture, Engineering and Construction trades.  CAD is the primary tool of communication in these trades.  There are stringent rules, and intensive mathematics involved to assure safety, cost efficiency, and product feasability.\n\nMechanical Desktop is an extension of AutoCAD (authored by Autodesk).  The primary use is in the manufacturing trades.  Many companies today have chosen NOT to even create paper documents, but instead have computer monitors to read the CAD files, operate machinery and complete the work.\n\nMechanical Desktop has "tools" beyond "Vanilla AutoCAD" that enhance the ease and accuracy of 3D modelling, and robotics.
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Architectural Design is a Engineering effort which shows the detailed design/structural details of a building/construction/bridge etc.Typically the design consists of Engineering drawings,3-Dimesion views which shows the finers details of the construction which are drawn to some scale( not the exact size of the structure ) and consists of technical details/specifications