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测量大于1m长的内孔直径、母线直线度和表面粗糙度有一定困难。为测量直径50～450mm,长达4m内孔的直径,设计制造了一种装置(图1),该装置
It is difficult to measure the diameter of the inner hole larger than 1m, the straightness of the busbar and the surface roughness. To measure the diameter of a bore of 50 to 450 mm in diameter and up to 4 m in diameter, a device was designed and manufactured (Fig. 1)