Basic features

An analysis of existing CAD/CAM system reveals that they all offer a basic set of feature .this set universal among them ,although each system may use different name to designate them .this basic set inculedes the following features: execution, revolution, hole,cut ,sweep,loft ,fillet ,chamfer ,rib ,shell,draft, pattern, spiral,and helix. An extrusion feature is used to created a unifrom thickness model .it requires a cross section and extursion vector .we have also already covered it section . A REVOLUTION feature is used to crete axisymmetric [login to view URL] requires a cross section an axis of revolution, and an angle of revolution , A hole feature is used to cretate hole [login to view URL] require a hole or radious ,a length, and an axis to define orientation A CUT freture is used to cut material from another existing [login to view URL] CAD system use different name for feature. A SWEEP features is used to created model with a constant Cross section along a nonliner axis