Using the geneva wheel as an example

which is often used in automatic machine

performance deficiency about geneva mechanism is explained.Geneva-cam combined mechanism is designed to improve the performance.The CAD system for combined mechanism is established.When design and calculations of the combined mechanisms are completed using VB programming.The parametric design and movement simulation of geneva mechanism are realized by second developing technology for AutoCAD in VB.It improves the efficiency and gives a theoretical base of digital design and manufacture for Geneva-cam combined mechanism.