Bearing for pivot of the axis is used as a supporting shaft and parts on the shaft, the shaft usually has two poims.
滚动轴承作为轴的支点用来支承轴及轴上零件，通常的轴都有两支点。
This instrument is used for measuring roundness, axis straightness, coaxality and circular run out error of shaft parts.
该仪器可用于圆度、轴线直线度、同轴度和径向跳动误差等项目的测量。
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