锪孔钻
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spot-facer
huō kǒng zuàn
spot-facer; spot-facing; spot-facing drill
пословный:
| 锪孔 | 孔钻 | ||
(1) [countersinking]∶在孔的顶部周围作成漏斗形凹坑的钻进操作
(2) [spot-facing]∶在孔的顶部周围作成圆柱形凹坑以便安置螺钉头或垫圈, 或者使连接零件能齐平安装
зенкерование, core drilling, hole enlarging
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