The tester in question is an optical-mechanical-electronic-computerized combination for the fast and automatic measurement of bullet shells' length and base dtameter. The ddriensional accuracy is 0. 02mm and measurement speed is 250 pieces min' Selection of the optical path for the system, choice and calculation of the light source and parameters are described' It is pointed out that the expressiun of D gives the dtameter of spot in the original image plane where the object moves for an axial displacement ...
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