STEP-compliant NC research: the search for intelligent CAD/CAPP/CAM/CNC integration

TLDR

Since the 1950s, NC machine tools have evolved far beyond their origins, yet progress has been constrained by legacy programming languages (ISO 6983/RS274D); the emerging STEP‑NC standard (ISO 14649/ISO 10303 AP 238) now enables bi‑directional integration of CAD/CAM data with intelligent CNC controllers. This paper reviews STEP‑NC developments across a range of CNC processes and envisions a future STEP‑NC‑compliant process chain that integrates CAD, CAPP, CAM, and CNC while identifying key issues and challenges. The review covers major international projects and research efforts from Germany, Switzerland, the UK, Korea, the USA, and New Zealand, illustrating how STEP‑NC is being adopted and advanced worldwide.

Abstract

Since the first generation of Numerically Controlled (NC) machine tools was developed in the 1950s, there have been many developments which make today's NC machines completely unrecognizable from their early ancestors. Further developments, however, are now being significantly limited by the current programming language (ISO6983 or RS274D) that has been supporting NC manufacture since day one. Today a new standard, informally known as STEP-NC, is being used as the basis for development of the next generation of Computer Numerically Controlled (CNC) controller. This new standard is ISO 14649 and ISO 10303 AP 238. This standard gives CAM and CNC vendors the opportunity to integrate the capabilities of CAD/CAM systems with a new breed of intelligent CNC controllers, which have bi-directional communication of information representing standardized geometric and manufacturing data. This paper presents a comprehensive review of STEP-NC developments for a range of CNC processes. These developments include some major projects collaborated at the international level as well as those carried out by different groups of researchers in countries such as Germany, Switzerland, UK, Korea, USA and New Zealand. This paper also tries to portray a futuristic view of STEP-NC applications for CAD, CAPP, CAM and CNC integration, identifies the issues and challenges for STEP-NC, and provides a vision of a STEP-NC-compliant process chain supported by a product and manufacturing model.