Design process is basically the information process, because starting from the idea, performed using the data and knowledge, and ends with information about how to object to look and what behavior is expected during operation. Also, used and processed a large amount of data, which is a perfect area for the application of computers. This paper presents basic principles of computer-aided design using an example of butterfly valve. Modelling was performed with CAD/CAM/CAE software package CATIA V5. Geometric modeling of parts and assembly of butterfly valve was performed in Sketcher, Part Design Assembly Design and kinematic analysis was performed in DMU kinematics module.

New technologies which are mainly based on high speed and precision (robots, manipulators, machine tools, etc.) impose special requirements for gears. Other technologies such as telescopes, radar systems, antenna systems, etc., require high accuracy and speed of positioning. Common for all these facilities and devices are transfer of information, energy and materials from one state to another without bringing their own faults in the system. So, it is important that gears do not have excessive internal backlash. Harmonic drive gears are one of the newer gears which in there is no internal backlash. Harmonic drive gears have other advantages such as high capacity output bearing, high torque capacity, excellent positioning accuracy and repeatability, compact design, high single stage ratios, high torsional stiffness, high efficiency, simple installation and assembly, etc. In this paper it is described some cases of using Harmonic drive gear in machine tools.

Operational experience in development of new products, over the past ten years have shown a increased need for new PLM (Product Lifecycle Management) and PDM (Product Data Management) software. New product design and steadily growing structure complexity in industrial environment (especially in automotive and aerospace industry) lead to new requirements in basic PDM architecture. Regard to constantly new product requirements, the PDM architecture is constantly changing to achieve optimum outcomes in the product design process. In this paper we expose our approach to give some specific guidelines in creating a own PDM software database for some cases in the automotive industry. On the other hand whilst major CAD companys have perceived the permanently need for new PDM software we try to give a cutaway of the instantaneous market situation for PDM software (Windchill PDMLink, Enovia Solutions, Streamline etc.). Simultaneous solution (basic sketch) for solving the needs of constantly changing design requirements is given with a own developed software which combines the general PDM modules with the specific requests of a product. In this case a brake disc was choosen, represented in the CATIA V5 software followed by a PLM analyse trough the own developed (basic sketch) PDM software.