![]() ![]() Not only this will assist clinicians and other users to easily develop and modify P3 with/without 3D modelling knowledge but could also contribute to the development of other low cost and efficient prosthesis that can be integrated into other platforms such as websites and mobile applications. This was implemented through Visual Basic Application (VBA) programming and open Application Programming Interfaces (APIs). As a feature for P3, CAD/CAM (Computer Aided Design and Computer Aided Manufacturing) systems were utilized to automate modification of P3. ![]() Furthermore, the design was analyzed using Boothroyd’s Design for Assembly (DFA) theory which illustrated a 10% DFA Index increase including a 14% reduction of assembly time and 16% reduction in the number of parts. Results showed a decrease in the estimated printing-assembly time, mass, and material costs when compared to the previous model, Prototype 2. Several methods were used to analyze P3 including Finite-Element Analysis (FEA), Fused Diffusion Modelling (FDM) parameter comparison, and subjective analysis. P3 is an upper limb device, permitting five Degrees of Freedom (DoF) actuated by elastics to support a 2-years old patient diagnosed with Arthrogryposis Multiplex Congenita (AMC), a muscle and joint disabling disorder. This design and development project present a rehabilitative system for the upper limb consisting of two modules (1) a re-designed passive assistive upper limb exoskeleton P3 and (2) an Application Program Interface (API), the P3 Modifier. The application then carries on by automatically modeling the manufacturing process and ultimately generating the NC program from the cutter location data for a given CNC machine tool. ![]() In the first step of the application, the entire 3D model of the impeller-type model is automatically generated according to variable values taken as user-defined entities from the interface. The machining technology is that of 3-axis CNC, thereby each curve extends along a constant x-y plane. The developed application incorporates Simpson’s method, Bezier-Bernstein equation and Non-Uniform Rational B-Spline for curve approximation describing blades of centrifugal impellers, as a representative case study. To do so, a newly developed application was built exploiting application programming interface objects of parametric instances, in order to automate time-consuming repetitive tasks for the preparation of 3D models and their direct manufacturing process. This paper proposes a novel approach of automating both the design and manufacturing processes of impeller-type geometries, when CAD/CAM technology is employed. For product lifecycle management reasons, research trends impose the need of automated engineering tasks, such as computer-aided design and manufacturing. ![]()
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