Recognition of machining features provides a bridge between Computer Aided Design (CAD) and Computer Aided Manufacturing (CAM) of machined parts. CAD produces part descriptions in terms of geometric entities or design features, which need not coincide with the manufacturing features needed by process planning activities. The CAD data must therefore be interpreted so as to generate part represen...

This paper describes a method of machining feature recognition from a freeform surface based on the relationship between unique machining patches and critical points on a component’s surface. The method uses Morse theory to extract critical surface points by defining a scalar function on the freeform surface. Features are defined by region growing between the critical points using a tool path g...

The applications of various technological advances in implant dentistry and in all aspects of the diagnostic, treatment planning, surgical, and restorative phases are gaining popularity. Additive rapid prototyping and computer-aided design/computer-aided manufacturing (CAD/CAM) technology are used to generate stereolithographic surgical guides and prefabricated interim prostheses to facilitate ...

PURPOSE The aim of the present study was to evaluate the in vivo accuracy of flapless, computer-aided implant placement by comparing the three-dimensional (3D) position of planned and placed implants through an analysis of linear and angular deviations. METHODS Implant position was virtually planned using 3D planning software based on the functional and aesthetic requirements of the final res...

Osteotomies around the knee address lower limb deformities that affect the leg posture and especially the knee joint. Knee arthritis is a very common age-related joint disease that can be treated with osteotomy, as an alternative to knee replacement by implants. The preoperative planning process is demanding and significantly determines the surgical out-come. The choice of the osteotomy type an...

Background Information and Communication Technology (ICT) is increasingly finding the way into all fields of human society. This development results from the believe, that computerised workflow is quicker, more efficient, and cost-effective than the traditional workflow [1]. A few years ago e-business began to reach local governments. The label e-government comprises applications and objectives...

The electronics computer-aided process-planning (ECAPP) system is a rule-and frame-based generative process-planning system for the assembly of electronic components onto printed circuit boards (or modu-less). ECAPP uses expert process-engineering knowledge, a manufacturing plant's specific process capabilities, and product information from a computer-aided design (CAD) database to generate all...

In this paper, the problem of minimizing the number of drawing stages and heat treatments needed for the multi-stage deep drawing of cylindrical shells is addressed. A conventional rule-based computer-aided process planning (CAPP) is utilized within a dynamic programming approach to generate a set of alternative optimal process plans. A finite element analysis is carried out to guide the select...