The inside of the pipe needs welding and grinding.
管子内部需补焊打磨。
The structure, principle, usage and design cruxes of a jig for accurately grinding inside holes in main shaft are presented.
介绍一种磨削高精度主轴内孔夹具结构原理、使用方法及设计要点。
No surface protrusions or grinding allowed inside this area. Protrusions on remainder of surface to be . 03 maximun height.
这个区域的表面不允许有拱起或者磨削的，其余区域的表面拱起高度不得超过0.03。
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