Expert CAPP system for single spindle automats

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Abstract
We report the design and implementation of an expert system (EXTURN) for the process planning of rotationally symmetric components manufactured on single spindle automats. EXTURN essentially comprises an interactive graphical feature modeller (GFM) and process planning modules for operation extraction, sequencing, tool selection, and process plan generation. The feature modeller provides utilities for interactive component synthesis, manufacturability assessment, dimensioning and tolerancing, graphical display etc. The CAPP module synthesizes a process plan from the part model created by GFM, using rules organized in the knowledge base. EXTURN has been implemented for both the cut-off as well as the turret type of automats and has been tested for a variety of industrial components. It was found to generate consistent process sequences acceptable to industrial shop practices