Research of diamond weak combined bit for high geo-stress stratum drilling;
弱包镶金刚石钻头在高地应力地层中的应用研究
Research into the new electroplating weak-holding diamond bits;
新型电镀弱包镶金刚石钻头研制
Research,development and application of the series core drilling bit for uranium exploration;
铀矿勘查岩心钻探系列钻头的研制、开发与应用
Research of the Edge Grinding with the Simplified Conical Drill;
简化钻头圆锥面刃磨法的研究
Dynamic Model of Drill during Vibrational Drilling;
振动钻削时钻头的动力学模型
A Forecasting System for Wear of Drill;
基于电流信号钻头磨损状态预报系统
unit-type drill head
组合钻床钻头, 标准钻头
drill(ing) head
钻头; 主轴头; 钻床床头箱; 钻削动力头;钻头头部, 钎头
part of a drill that grips the bit
夹头（钻或钻床上用以夹住钻头的部分）.
a small bit that drills a first hole to guide a larger drill.
钻凿初洞来导引大钻头的一种小钻头。
easing the bit in
钻头轻压慢转钻进地层
A tool used for drilling.
钻头用于钻孔的工具
a bit used in drilling for oil.
油田钻井使用的钻头。
A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
钻头曲柄、钻柄或钻床之上用于钻孔的尖头工具
eggbeater PDC bit
打蛋器型PDC钻头
Drilling is cutting a hole with a drill.
钻削就是用钻头钻一个孔。
Comparative analysis of drilling characteristics of dia- mond bits and roller bits
金刚石钻头与牙轮钻头钻井特点对比分析
bit cutting angle
钻冠的尖度，钻头磨角，钎子头刃角
A needle-shaped drill for boring holes in rock or masonry.
钻头，钻石器，钻孔器用于在岩石或砖石上钻孔的针形钻
An awl with a beveled tip, used to make holes in wood for brads or screws.
锥钻，打眼钉钻头倾斜的钻子，用于在木头上钻孔以钉角钉或螺钉
a thin bit a center point and cutting edges on either side.
一头是圆头、一头是切边的一种瘦钻头。
a drilling bit with cutting edges usually hard-tipped against wear.
有靠着钻身的硬顶和切边的一种钻井钻头。
7.12 Trip up at once, pull the bit into the casing.
立即起钻，将钻头提到套管内。
Sometimes he sends his drill more than a mile into the earth.
有时他得把钻头钻入地下一英里深。