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橡胶O 形圈是橡胶制品中尺寸公差要求比较高的产品。但是它的尺寸公差比起机械零件加工精度来说是不高的。虽然,O 形圈的测量精度要求较低,然而,由于它的可变形性,要准确测量一只橡胶O 形圈,却比准确测量一个普通机械零件困难得多,当前一些研究单位是采用大型工具显微镜和大型投影仪来测量的。这类仪器本身精度高,无测量力,能满足测量要求。但其致命的缺点是不适用于大规格的O 形圈,规格大,它的自由状态与正圆形距离就大,而且随遇而安,所以很难用测定一对或少数几对互相垂直的直径的办法来求取它的真实平均直径,以致不可能用此类仪器进行测量。另外大型工具显微镜和大型投影仪价格昂贵、且供不应求,不可能在生产厂中普遍使用。
Rubber O-ring rubber products in the tolerance requirements of relatively high-dimensional products. However, its dimensional tolerance is not high compared to the machining accuracy of mechanical parts. However, due to its deformability, it is much more difficult to accurately measure a rubber O-ring than an ordinary mechanical part. Some of the current research units are large Tool microscopes and large projectors to measure. Such instruments themselves, high precision, no measurement force, to meet the measurement requirements. But its fatal disadvantage is not suitable for large O-ring specifications, its size, its free state and the positive circle distance is large, and with the event, it is difficult to determine a pair or a few pairs of mutually perpendicular diameter Way to get its true average diameter, so that it is impossible to measure with such instruments. In addition, large-scale tool microscopes and large projectors are expensive and in short supply, and can not be commonly used in production plants.