Three Dimensional Mechanical Transmission Parts CAD Software Development

In this thesis, the properties, function and key technology of developing process in three dimensional mechanical transmission parts CAD software are introduced in detail. This professional three dimensional mechanical CAD software is based on AutoCAD 2000 software platform in the WINDOWS 98 system.The software's development takes advantage of ObjectARX 2000 and Visual Lisp of AutoCAD 2000 re-exploitation which are the newest languages at present. Through the programming environment of Visual C++ 6.0, the visual interface design of the software is realized by making great use of the resources of WINDOWS and class of MFC. The software uses two entity configuration methods: extruding and simulating entity cutting in realizing three dimensional configuration, which successfully achieve three dimensional configuration of involute columnar vertical gear, involute columnar helical gear, standard vertical spline, archimedes worm and disco-cam. Finally, the three dimensional configurations are imported to 3DMAX software. Making great use of powerful entity rendering and animating ability in 3DMAX software realizes gear-spline mesh, gear-gear mesh and cam-block moving dynamic simulation. In addition, parameterized design of involute columnar vertical gear's 2-D part drawing and calculating the basic parameter of gears outer-mesh are available in this software.This software has characteristics of new generation CAD software and practical value.