pit ; aperture ; cinclides ; thecal pore
工件机壁孔之公差必须为H7，保证内外环较高同轴度。
The rabbet for install the outer must be H7 tolerance, ensure a high axiality.
为了减轻床身的重量和保证床身的刚度要求，设计了板壁孔结构。
To reduce the lathe-bed and assure its stiffness requirement, a batten wall pore structure is designed.
为了保证有足够的刚度，机床对板壁孔的形状、位置和大小都提出了相应的要求。
In order to assure adequate stiffness, the lathe has relevant requirements for the shape, location and size of the batten wall pore.
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