Design of precision measurement system for metallic hole

Lee, Neville K. S.; Chow, Jacky K. H.; Chan, Albert C. K.
January 2010
International Journal of Advanced Manufacturing Technology;Jan2010, Vol. 44 Issue 5/6, p539
Academic Journal
For most of the high-speed hole diameter measuring process, a contact measuring method is undesirable due to its slow and destructive touching process. Thus, an optical method is usually chosen for non-contact measurement. Unfortunately, for most holes in precise manufacturing, especially those with a high aspect ratio, the optical method cannot be used. In our study, we developed a simple and low-cost precision capacitive hole measuring system. By using a simple alignment mechanism, we prove that a high-resolution hole diameter can be achieved. Comparing a traditional measuring method like coordinate measuring machine with our system, over 99% correlation is easily obtained. The paper also presents a multilayer hole measuring probe and sensor probe for non-through-hole measurement.


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