Computer Aided Design
It is a software by the help of which we can create 2D drawing or 3D modeling. Tool that enables us to make quick and accurate drawings with the use of computer. CAD is used to improve the quality of design and drawing. It's improve communication through documentation for manufacturing.
CAD Softwares for manufacturing purpose
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SketchUp — a proprietary CAD application that runs in a web browser, formerly developed by Google.It is just used for freehand sketching just for referencing your ideas roughly.
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AutoCAD - It is commercial CAD software titles published by Autodesks. It is most widely used for 2D Drafting software which is almost used in every field of engineering i.e.Mechanical, Civil, hydraulic & Pneumatic. etc.Solid modelling (3D) and surface modelling can also be done but it is a Non-Parametric software ,so it's very difficult to modify model.Drafting from 3D model can be also done .It is a Low-End Software.
Other Important Softwares
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3ds Max, and Maya — commercial CAD software titles published by Autodesk.
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Blender — an open-source CAD, animation, and image processing application with an active community of users.