Development of a Cnc Router Adherent to Standard Step- Nc Based on the Controller Advanced Machine (emc2)

This paper describes the development and validation of a computer numerical controller architecture adherent to the standard STEP-NC Part-11 that is associated with the milling process. The STEP-NC controller development is based on the open source driver EMC (Enhanced Machine Controller or LinuxCNC) adherent to the standard RS-274 that originally works with the NC program using codes G/M (G-code). In order to validate the controller architecture was developed a NC machine tool topology type Router (portal structure) with three degrees of freedom as having the controller the LinuxCNC in x86 platform (personal computer) using the operating system Ubuntu/Linux with Kernel on Real time. The controller LinuxCNC has been integrated with the Data Model STEP-NC Part-10, 11 e 111, using an adapter, allowing the LinuxCNC to receive as input a numerical control program in format STEP-NC Part-21 also called STP. The format is based on the concept of workingsteps, machining features and machining operations, among others described by the standard, e.g., the STEP program focuses on a high-level description based on machining features and a more sophisticated data model but not the movement of the machine axes. This program numerical control with STEPNC code is generated by the integrated design, process planning and computer-aided manufacturing (CAD / CAPP / CAM) called STEP Modeler (http://www.grima.ufsc.br/stepnc_project /), developed by GRIMA / UFSC, that allows the modeling of a prismatic part web-based machining features, having a data model adheres to the STEP project, enabling the integration of the life cycle of a piece, from design to manufacturing, via the Web. The LinuxCNC controller with adapter STEP-NC uses code generated by STEP Modeler and runs transparently to the operator of the CNC Router specially developed for validating the architecture conceived. This development allowed the validation of the concept of integration Lifecycle based on the data model of STEP-NC, from design to manufacturing using the concepts of design and machining features. The architecture is presented using models IDEFØ (Integration Definition for Function Modeling) and UML (Unified Modeling Language), showing the specification of integrated system CAD / CAPP / CAM, particularly the stage associated with CAM Execution, e.g., the controller/adapter STEP-NC developed based on LinuxCNC. The detailed project of the CNC Router is presented in a summarized manner. The results are shown through case study, process planning and manufacturing parts examples, its measurement and analysis. The ambience STEPNC has been designed for Web context being also used in the disciplines of the Manufacturing Automation of graduate and postgraduate at UNB and UFSC, aiming at presentation of concepts and data models based on STEP, which will be the future of Automation Manufacturing, gets more mature every year.