N-bit

Method of Calculating Three Cone Bit Diameter by Using Excel

用Excel实现三牙轮钻头直径计算的方法

The max. depth of drilling is about 50 times of drill tools dia and have to see material for drill specially size.

本机种钻孔深度以钻头直径50倍为标准,特殊规格需视加工材质定.

Bit Design for Main Pier Bored Piles of Donghai Bridge

东海大桥主墩大直径钻孔灌注桩钻头设计

Study on the Effect of the Nozzle of Drag Bits on Bottom Hole Flow Field

刮刀钻头喷嘴直径对井底流场的影响研究

The CAD System Development of the Grinding Wheel Cross-sectional Profile Machining the Micro-diameter Drill's Flute;

加工微小直径钻头螺旋槽用砂轮截形CAD系统的开发

Design and Application of large Diameter Bit in Rock and Soil Drilling

岩土钻探工程大口径钻头设计与应用

Study on drill bit for large diameter core drilling of deep hole in hard rock

硬岩深孔大口径取芯钻进的钻头研究

The rotary carriage provides rotary and vertical motion to the drill string and bit.

转动滑架为钻柱和钻头提供转动和垂直移动。

high efficiency drilling system for small and deep hole

高效小直径深孔钻削系统

Research on the Bearing Performance of the Super-Long and Large-Diameter Bored Pile;

超长大直径钻孔灌注桩承载性能研究

EXPERIMENTAL RESEARCH ON NEGATIVE SKIN FRICTION OF LARGE-DIAMETER BORED PILES

大直径钻孔灌注桩负摩阻力试验研究

Technology of 1000 meter directional borehole at large diameter for mine gas extraction

顶板大直径千米长钻孔抽采瓦斯技术

Numerical simulation of injecting cement design parameters for the large diameter bored pile

大直径钻埋桩压浆设计参数数值仿真

PDC Variable Diameter Drilling Bit Mechanical Characteristics and Structural Design;

PDC变径钻头力学特性及结构设计

Gas drainage in seam with large auto variable diameter bore holes

自动变径大直径钻孔抽放煤层瓦斯试验

nominal cartridge diameter of microphone

传声器极头公称直径

the ratio of the focal length to the diameter of a (camera) lens system.

相机镜头直径焦距比。

nominal cartridge diameter

传声器极头标称直径