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Virtual metrology frame technique for improving dynamic performance of a small size machine tool.

Abir, J*; Longo, S*; Morantz, P*; Shore, P (2017) Virtual metrology frame technique for improving dynamic performance of a small size machine tool. Precision Eng., 48. pp. 24-31.

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Abstract

This paper presents a novel concept, a virtual metrology frame, for enhancing the dynamic performance of a machine tool with a flexible structural frame. The dynamic properties of a machine are directly affected by the stiffness of its frame, and its reference system; thus, by having an unstressed metrology frame, superior dynamic capabilities can be achieved. The developed concept does not require physical components associated with metrology frame; hence it is ideal for machine tools with requirements for small footprint and ultra-precision performance. The concept relies on an accelerometer based feedback technique, where the accelerometer is used as a precision frame displacement sensor. The concept does not require a complex controller, and was realized in an off-the-shelf CNC controller. The concept was demonstrated on a linear motion system, a simplified version of a compact size CNC machine, and its servo bandwidth and dynamic stiffness were improved by 36% and 70% respectively, which are the key parameters for improving the machining accuracy.

Item Type: Article
Keywords: acceleration based displacement, flexible frame, PID controller, sensitivity function, virtual metrology frame
Subjects: Engineering Measurements
Engineering Measurements > Dimensional
Divisions: Engineering, Materials & Electrical Science
Identification number/DOI: 10.1016/j.precisioneng.2016.11.002
Last Modified: 02 Feb 2018 13:12
URI: http://eprintspublications.npl.co.uk/id/eprint/7486

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