spiral drill

The Constructional Techniques and Equipment of Underwater Pile-making with Long Spiral Drill

长螺旋钻水下成桩工艺及设备

Analytical Calculations of Backing-off Angle of Involute Spiral Surface Twist Drill

渐开螺旋面麻花钻后角的分析计算

Drilling-into-pile techniques by the Short Spiral Drill is introduced through examples, which can be covered in the construction of city roads.

通过实例详细介绍了短螺旋钻机钻孔成桩工艺，在城市道路建设中具有推广价值。

Mathematical Model for Variable Pitch Spiral Drill Point and Grinding Interference

变螺距螺旋面钻尖的数学模型及其刃磨干涉

Spiral drill pipe: Cold-drawn forming a blade, anneal, good toughness, and durability.

螺旋钻杆：冷拉一次成型叶片，不退火，韧性好，耐用。

Integral spiral heavy weight drill pipe is to extend the central upset of heavy weight drill pipe and to cut spiral groove on heavy weight drill pipe.

整体螺旋加重钻杆是在整体加重钻杆的中间加厚部位延长并铣削螺旋槽。

The machine equipments needed has spiral drill press and drill to expand machine or diving drill press.

所需机械设备有螺旋钻孔机、钻扩机或潜水钻孔机。

A discussion on increasing the service life of spiral bevel gears on drill rigs

提高钻机弧齿圆锥齿轮工作寿命因素探讨

Spiral drill collars made in our plant are in accordance with API standard.

本厂制造的螺旋钻铤按照“API” 标准生产和验收.

They have not measured the length of spiral drill collars and monel collars yet.

他们还没测量螺旋钻铤和无磁钻铤的长度。

A New Method of Grinding the Spiral Surface Drill Point

螺旋面钻尖刃磨的新方法

Spiral drill: steel blades, drill, wear resistance.

螺旋钻头：铸钢叶片，钻尖，耐磨。