Application and evaluation of optical distance measurements in geometrical quality testing of microgears
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Microgears are increasingly important in industry. Compared to normal gears, the quality assurance of microgears needs more accurately measured data and simple but feasible measurement methods because of their dimension particularities, which are usually obtained with coordinate measuring systems. The disadvantages of this measurement technique are not only huge time and money consumption but also inconvenience due to the weight and dimension of the coordinate measuring machine (CCM). This paper proposes using an optical chromatic white light sensor CWL to scan the profile of microgear wheels instead of using a CMM. The possibility of calculating optimized positioning of the sensor is introduced; the principle of the measuring method and relevant calculations for generating the contour and analyzing theoretical errors are described. With the measured data, several exemplary geometrical deviations are shown and evaluated by comparing with the measurements from a CMM. Compared to the conventionally used methods, this method spends short time to conduct the geometrical measurement. Integrating this method into the test rig for functional testing, functional and geometrical testing can be conducted at once and, thus, save even more time.
Keywordsmicrogear optical distance measurement profile deviation CWL sensor micromechanical technology (MMT)
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