Mechanical 3D modeling is an art of crafting a methodical wire-frame demonstration of any 3D (three-dimensional) object. With CAD tools, 3D models could be displayed as an image in print using computer simulation. CAD Modeling is usually the first step in a rapid prototyping (RP) system. The conventional approach to CAD modeling is through engineering drawings. A designer inputs dimensions and interconnects lines (along with other basic shapes) using CAD software like AutoCAD, Pro-E, 3D-max.etc to create a virtual 3D model.
Benefits of using Mechanical 3D Modelling in product design are: -> Speedy validation/verification of designs against specifications & design rules -> Effective 3D visualization for full fledged manufacturing drawings -> Accurate wire-frame geometry creation -> Bi-directional parametric association (alteration of any feature is reflected in all information relying on that feature; mass properties, drawings, assemblies, etc.) -> Simplified design of assemblies, which are set of parts and/or other assemblies -> Hassle-free checking of kinematics, interference and clearance in assemblies -> It allows for 3D sectional views
With field modifications, inadequate support from the original CAD models poses a problem. The technical person on the field may have found a better way to mount the part by amending the original design, or damage to the part may demand modification to rectify the issue. This modification may not be documented in the CAD archives but can be accomplished with 3D parametric models of the mechanical design.
Also, a design engineer may want to introduce a value-added design to an existing part, but the first manufacturer of the part may not be willing to release their internal CAD files for proprietary reasons. The process of 3D modeling overcomes these problems by allowing the creation of a CAD model by scanning the existing object.
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