Superior to G-code, STEP-NC is a new data model for computer numerical control (CNC). It provides rich information for CNC machine tools. This high-level information contains feature-based data. Unlike G-code that describes 'how-to-do', STEP-NC models 'what-to-do' at the task level in terms of features and 'Workingsteps'. In the absence of a STEP-NC controller, there is a need for a system which can work with STEP-NC data and at the same time interface with the existing CNC machine tools. This paper describes such a system. This system acts like a 'front-end' for the current CNC controllers, giving these machine tools a 'Plug-and-Play' feature. The core of the system is the mapping mechanism which accepts STEP-NC data and translates it into the type of G-code that a specific controller can understand. The key to the mapping mechanism is the use of function block (IEC 61499) technology. This gives the system robustness and modularity.

SUMMARYThe heavy reliance which New Zealand places on its primary industries makes it important that every effort be made to automate these industries to improve their productivity. This presents many unique problems, especially when consideration is given to the use of robots in the horticultural sector for the handling of soft fruit for export. As part of this process, fruit must be individually packed in trays without the risk of damage. This is currently achieved through labour-intensive manual handling and for this reason a range of specialised robot grippers have been developed. These, to varying degrees, overcome many of the problems associated with the harsh handling which occurs when conventional industrial robot grippers are used.

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