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Error Prevention and Detection in Data Preparation for a Numerically Controlled Milling Machine



Thomas Kramer, W Strayer


In the Vertical Workstation (VWS) of the NBS Automated Manufacturing Research Facility, metal parts are machined automatically from a feature-based design. A simple two-and-a- half dimensional part may be designed and machined within an hour, allowing half the time for design input. Workstation activity may be divided into design, process planning, data execution, and physical execution stages. In order to make VWS operation safe and accurate, extensive error prevention and detection (verification) procedures have been incorporated in the data preparation stages, particularly design and data execution. Automatic verification includes, design editor dialogues, design enhancement, design verification (subdivided into parameter type checks, feature verification, and reference feature fit checking), process plan verification, work-piece verification, part model checking, and other items. Interactive verification includes design drawing, work-piece model drawing, and tool path drawing. The feature verifiers are prepared by a rule-based automatic programming subsystem.
NIST Interagency/Internal Report (NISTIR) - 3677
Report Number


vertical workstation, VWS, AMRF, automatic verification, process plan


Kramer, T. and Strayer, W. (1987), Error Prevention and Detection in Data Preparation for a Numerically Controlled Milling Machine, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed July 12, 2024)


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Created December 31, 1986, Updated October 12, 2021