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<p>Measurement of the cutting edge of a micro drill bit presents considerable challenges due to its steep surface gradients and shape. Aiming to overcome these difficulties, a measurement system that combines a compact chromatic confocal probe, a machine vision system for pre-alignment, and a four-axis scanning stage was developed. A tailored probing procedure was proposed, considering the acceptance angle of the measuring probe and optimal scanning parameters. Aiming to reduce the filtering effect of the light spot, a blind deconvolution method was applied. The system successfully measured the main cutting edge profiles of micro drill bits with diameters ranging from 0.25&#xa0;mm to 0.6&#xa0;mm, confirming its feasibility. Additionally, a GUM-based uncertainty analysis further proves the validity of the measuring method and system, demonstrating sub-micrometric uncertainty.</p>

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Cutting Edge Profile Measurement of a Micro Drill Bit Utilizing Chromatic Confocal Probes and Blind Reconstruction Strategy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月18日

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  • Zhong-Hao Cao,
  • Xin Xiong,
  • Peng Hu,
  • Zhongwei Li,
  • Bing-Feng Ju,
  • Yuan-Liu Chen

摘要

Measurement of the cutting edge of a micro drill bit presents considerable challenges due to its steep surface gradients and shape. Aiming to overcome these difficulties, a measurement system that combines a compact chromatic confocal probe, a machine vision system for pre-alignment, and a four-axis scanning stage was developed. A tailored probing procedure was proposed, considering the acceptance angle of the measuring probe and optimal scanning parameters. Aiming to reduce the filtering effect of the light spot, a blind deconvolution method was applied. The system successfully measured the main cutting edge profiles of micro drill bits with diameters ranging from 0.25 mm to 0.6 mm, confirming its feasibility. Additionally, a GUM-based uncertainty analysis further proves the validity of the measuring method and system, demonstrating sub-micrometric uncertainty.