New low cost sensing head and taut wire method for automated straightness measurement of machine tool axes

Article English OPEN
Borisov, Oleg ; Fletcher, Simon ; Longstaff, Andrew ; Myers, Alan (2013)
  • Publisher: Elsevier BV
  • Journal: Optics and Lasers in Engineering (issn: 0143-8166, vol: 51, pp: 978-985)
  • Related identifiers: doi: 10.1016/j.optlaseng.2013.02.013
  • Subject: Mechanical Engineering | TJ | Electrical and Electronic Engineering | Electronic, Optical and Magnetic Materials | T1 | Atomic and Molecular Physics, and Optics

This paper describes a novel method to measure straightness error of an axis of motion with a system utilizing taut wire, optical sensor and reference error cancellation technique. In contrast to commonly used taut wire, straightedge or laser-based methods it combines simplicity of setup and low cost with high levels of automation, accuracy and repeatability. An error cancellation technique based on two-point method is applied for the first time to a versatile reference object which can be mounted at any place of machine’s working volume allowing direct measurement of motion straightness of a tool point. Experimental results on a typical machine tool validate performance of the proposed taut wire system with a commercial laser interferometer operating in the same conditions is used as a reference. The proposed method shows highly repeatable results of better than ±0.25μm over the range of 0.48m and measurement accuracy comparable to the interferometer of ±0.5μm.
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