15 November 2011 Development of a 3D touch trigger probe using micro spherical stylus machining by micro-EDM for micro-CMM
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Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 83213A (2011) https://doi.org/10.1117/12.905263
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China
Abstract
This study develops a low-cost three-dimensional touch trigger probe for micro-CMM using micro spherical stylus machining by micro-EDM. The tip ball of the stylus, with a diameter smaller than 100 μm, is made by a micro electro discharge machine with the method of wire electro discharge grinding (WEDG). The current study uses tungsten carbide (WC) as the material for the stylus. Experimental results show that, the tip ball roundness could amount to 2 μm. Since the tip ball is not easily observable by naked eyes, we designed a micro imaging system to observe the probing in real time. This system is created with modified commercial webcam and microscope. The general design of the touch trigger probe is combined the stylus and suspension structure. When the stylus touches workpiece, it can be determined the time of probe trigger by measuring the motion of suspension structure. The stylus machined by micro-EDM was very fragile and the stylus handle of the tip ball was very thin. Therefore, the stylus handle bends easily that would result in the large measurement error or stylus break when the stylus touched workpiece. In this study we designed a measuring probe using a small chuck and an electrical circuit to measure the probe trigger. When the stylus touches the workpiece, the parallel circuit will switch on immediately and pick up the voltage variation of the resistor. Because the transistor always turns ON, it can avoid the problems of excessive energy and electrical noise.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chih-Liang Chu, Chih-Liang Chu, Yi-Lin Chen, Yi-Lin Chen, Tzu-Yao Tai, Tzu-Yao Tai, Yun-Hui Liu, Yun-Hui Liu, Cheng-Hsin Chuang, Cheng-Hsin Chuang, Chin-Tu Lu, Chin-Tu Lu, } "Development of a 3D touch trigger probe using micro spherical stylus machining by micro-EDM for micro-CMM", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83213A (15 November 2011); doi: 10.1117/12.905263; https://doi.org/10.1117/12.905263
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