VRAx® denotes a platform for designing machine tools that is based on Virtual Reality (VR) technologies analogous to existing CAx tools. VR technology is used as an active development and design medium in this process, and data created in VR are recirculated into the overall development process. Variants of machine tools with parallel kinematics can readily be created by combining a modular approach with free modeling functionality. This reduces the development times of new machine tools by the direct implementation of the customer’s wishes in an immersive environment and with considerably increased transparency of the development process. This is achieved by consistent integration of VR into the development and design process. Starting from a building block system of components of machine tools with parallel kinematics (PKM), functions for freeform modeling and optimizing the machine structure become available.