Design is a fundamental creative human activity. This certainly applies to the design of artefacts, the realisation of which has to meet many constraints and ever raising criteria. The world in which we live today, is enormously influenced by the human race. Over the last century, these artefacts have dramatically changed the living conditions of humans. The present wealth in very large parts of the world, depends on it. All the ideas for better and new artefacts brought forward by humans have gone through the minds of designers, who have turned them into feasible concepts and subsequently transformed them into realistic product models. The designers have been, still are, and will remain the leading 'change agents' in the physical world. Manufacturability of artefacts has always played a significant role in design. In pre industrial manufacturing, the blacksmith held the many design and realisation aspects of a product in one hand. The synthesis of the design and manufacturing aspects took, almost implicitly, place in the head of the man. All the knowledge and the skills were stored in one person. Education and training took place along the line of many years of apprenticeship. When the production volumes increased, -'assembling to measure' was no longer tolerated and production efficiency became essential - design, process planning, production planning and fabrication became separated concerns. The designers created their own world, separated from the production world. They argued that restrictions in the freedom of designing would badly influence their creativity in design."

This book contains selected contributions from the 6th CIRP International Seminar on Computer-Aided Tolerancing, which was held on 22-24 March, 1999, at the University of Twente, Enschede, The Netherlands. This volume presents the theory and application of consistent tolerancing. Until recently CADCAM systems did not even address the issue of tolerances and focused purely on nominal geometry. Therefore, CAD data was only of limited use for the downstream processes. The latest generation of CADCAM systems incorporates functionality for tolerance specification. However, the lack of consistency in existing tolerancing standards and everyday tolerancing practice still lead to ill-defined products, excessive manufacturing costs and unexpected failures. Research and improvement of education in tolerancing are hot items today. Global Consistency of Tolerances gives an excellent overview of the recent developments in the field of Computer-Aided Tolerancing, including such topics as tolerance specification; tolerance analysis; tolerance synthesis; tolerance representation; geometric product specification; functional product analysis; statistical tolerancing; education of tolerancing; computational metrology; tolerancing standards; and industrial applications and CAT systems. This book is well suited to users of new generation CADCAM systems who want to use the available tolerancing possibilities properly. It can also be used as a starting point for research activities.

Can a Baby Be an Enemy? Our world is in a deep, prolonged crisis. The threat of global nuclear war, the chronic condition of local wars, the imperilled environment, and mass star vation are among the major forms this crisis takes. The dangers of massive overkill, overexploitation of the environment, and overpopulation are well known, but surprisingly little has been said about their potential interac tions, their bearing upon each other. If there were to be a nuclear confronta tion between today's superpowers, it might not take place in today's world, but in a far less friendly habitat, such as the world may be some decades hence. And it need hardly be added that the era of this particular super power configuration may be waning rapidly, its place to be taken by other international arrangements not necessarily less threatening. To understand and cope with our situation we need correspondingly serious reflection. This volume forms a welcome part of that process. Un avoidably, a large part of our thinking about the issues of human survival must be oriented to physical and biological aspects of the total danger. But it has not escaped the authors of this book that, coupled with these aspects, there are profound psychological dangers, such as loss of the sense of futu rity, moral deterioration, and a fatalistic decline in the will to struggle to protect our home, the Earth."

Can a Baby Be an Enemy? Our world is in a deep, prolonged crisis. The threat of global nuclear war, the chronic condition of local wars, the imperilled environment, and mass star vation are among the major forms this crisis takes. The dangers of massive overkill, overexploitation of the environment, and overpopulation are well known, but surprisingly little has been said about their potential interac tions, their bearing upon each other. If there were to be a nuclear confronta tion between today's superpowers, it might not take place in today's world, but in a far less friendly habitat, such as the world may be some decades hence. And it need hardly be added that the era of this particular super power configuration may be waning rapidly, its place to be taken by other international arrangements not necessarily less threatening. To understand and cope with our situation we need correspondingly serious reflection. This volume forms a welcome part of that process. Un avoidably, a large part of our thinking about the issues of human survival must be oriented to physical and biological aspects of the total danger. But it has not escaped the authors of this book that, coupled with these aspects, there are profound psychological dangers, such as loss of the sense of futu rity, moral deterioration, and a fatalistic decline in the will to struggle to protect our home, the Earth."

This book contains selected contributions from the 6th CIRP International Seminar on Computer-Aided Tolerancing, which was held on 22-24 March, 1999, at the University of Twente, Enschede, The Netherlands. This volume presents the theory and application of consistent tolerancing. Until recently CADCAM systems did not even address the issue of tolerances and focused purely on nominal geometry. Therefore, CAD data was only of limited use for the downstream processes. The latest generation of CADCAM systems incorporates functionality for tolerance specification. However, the lack of consistency in existing tolerancing standards and everyday tolerancing practice still lead to ill-defined products, excessive manufacturing costs and unexpected failures. Research and improvement of education in tolerancing are hot items today. Global Consistency of Tolerances gives an excellent overview of the recent developments in the field of Computer-Aided Tolerancing, including such topics as tolerance specification; tolerance analysis; tolerance synthesis; tolerance representation; geometric product specification; functional product analysis; statistical tolerancing; education of tolerancing; computational metrology; tolerancing standards; and industrial applications and CAT systems. This book is well suited to users of new generation CADCAM systems who want to use the available tolerancing possibilities properly. It can also be used as a starting point for research activities.

Design is a fundamental creative human activity. This certainly applies to the design of artefacts, the realisation of which has to meet many constraints and ever raising criteria. The world in which we live today, is enormously influenced by the human race. Over the last century, these artefacts have dramatically changed the living conditions of humans. The present wealth in very large parts of the world, depends on it. All the ideas for better and new artefacts brought forward by humans have gone through the minds of designers, who have turned them into feasible concepts and subsequently transformed them into realistic product models. The designers have been, still are, and will remain the leading 'change agents' in the physical world. Manufacturability of artefacts has always played a significant role in design. In pre industrial manufacturing, the blacksmith held the many design and realisation aspects of a product in one hand. The synthesis of the design and manufacturing aspects took, almost implicitly, place in the head of the man. All the knowledge and the skills were stored in one person. Education and training took place along the line of many years of apprenticeship. When the production volumes increased, -'assembling to measure' was no longer tolerated and production efficiency became essential - design, process planning, production planning and fabrication became separated concerns. The designers created their own world, separated from the production world. They argued that restrictions in the freedom of designing would badly influence their creativity in design."