In production, we often encounter precise measurements of the length of the intersection of the end plane of the part to the extension of the conical surface and the cylindrical surface bus. This kind of data, we generally can not directly measure and obtain, and because of the process or structure of the part, or can not be indirectly measured by the method of placing the standard cylinder at the intersection of the part and the part of the part, we can try to avoid some For some (such as undercutting) parts, indirect measurement methods are used to obtain reliable data, and the parts are judged to be qualified or not.
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