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Avtometriya

2010 year, number 4

Analysis of the Contact Probe Mechanism for Micro-Coordinate Measuring Machines

K.-CH. Fan, F. Cheng, W.-T. Pan, R. Li
Keywords: contact probe, floating plate, stiffness, coordinate measuring machines
Pages: 54-62

Abstract

High precision contact scanning probes for measuring miniature components on micro- and nano-coordinate measuring machines requires sensitive mechanisms. This paper analyzes the mechanism of a developed contact probe in order to find its optimal dimensions. The contact probe is composed of a fiber stylus with a ball tip, a mechanism with a wire-suspended floating plate, and focus sensors. The wires experience elastic deformation when a contact force is applied. The probe mechanism with a four-wire floating plate is studied. Stiffness analysis is carried out using the theory of elasticity. It is found that, with a proper stylus length, a contact probe with uniform stiffness can be designed.