In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。
Social media users criticised the challenge, labelling it 'completely unsafe', however most seemed to be concerned the rotating drill would damage the competitive eater's teeth, not tear out his hair.
社交媒体的用户们对这项挑战持批评态度，他们认为这“完全不安全”，但是大多数人似乎是担心旋转的电钻会损伤挑战者的牙齿，而不是扯下他们的头发。
Drilling is performed with a rotating tool called a drill.
钻孔是用一个称为“钻头”的旋转刀具进行的。
Consider the risk of rotating and moving equipment with exposed parts that might catch the glove and pull it into the equipment, i. e., drill press, grinders and lathes.
应考虑转动和移动设备的危险，此类设备的外露部件可能会缠住手套，并将其卷入设备中，如钻床、研磨机和车床。
By taking advantage of rotating centrifugal force and the supporting effect of eccentric short drill collar, we cut off the axis inclination of bit, and avoid well inclination.
利用偏心钻具在旋转过程中的离心力和偏心短钻铤的偏重带的支撑作用，减小了钻头轴线倾角，从而减少了井斜。
Drilling is performed with a rotating tool called a drill.
钻孔是用一个称为“钻头”的旋转刀具实行的。
Most rotating chassis and winch (or hoist) systems of domestic drill rigs are driven by hydraulic transmission in the 90's.
90年代以来，国内研究制造的大扭矩转盘式工程钻机基本上都采用液压传动方式驱动转盘和卷扬（或提升）系统。
The utility model discloses a dedicated rotating tooling bracket for wedge part bore drilling and solves the problem that the slant finished plane of the small wedge part is hard to drill a reaming.
本实用新型公开的一种斜楔制件制孔专用旋转工装支架，解决了小型斜楔制件的斜加工面上不易钻铰孔的问题。
The electric drill with small power or a high rotating speed increases torsion or reduces the rotating speed by being provided with a speed reducer in order to increase dredging effects.
对功率小或转速高的电钻通过设置减速器来增大扭力或降低转速，以提高疏通效果。
The electric drill with small power or a high rotating speed increases torsion or reduces the rotating speed by being provided with a speed reducer in order to increase dredging effects.
对功率小或转速高的电钻通过设置减速器来增大扭力或降低转速，以提高疏通效果。
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