指井径仪测量的井眼直径与钻头尺寸之差。
The difference in the caliper-measured diameter of the well and the bit size.
从而对钻pcb的钻头尺寸与质量的要求也越来越高。
Thus the size and quality of PCB drill is demanding increasingly.
优点：是可以根据使用要求定做钻头尺寸、类型，价格成本较低。
Advantages: bit size can be ordered according to your requirement, price cost is low.
其重要作用是保持钻头尺寸符合标准，提高钻杆稳定性，避免钻杆下部过于磨损。
Its main functions are maintaining borehole gage, improving drill string stability and protecting lower drill string from excessive wear.
如果到头来提供“大脑宽带”有报酬的话，我怀疑那个问题的答案是：钻头(谐音赚头)是多少尺寸呢？
If it turns out that there's cash in broadband brain provision, I suspect the answer will be: how long is the bit on a drill?
入井前，带班队长或司钻要用合适的测量规核实扶正器、扩眼器、钻头，确保尺寸合适。
The Toolpusher or Senior Driller shall verify all stabilisers, reamers and bits will be gauged with appropriate ring gauge to ensure proper size before running in the hole.
钻台上有合适尺寸和种类的钻头盒。
The correct size and type bit breaker is to be on the rig floor.
为了改进PD C钻头设计，在全尺寸试验的基础上，对PD C钻头单齿切削过程进行了试验研究。
The single tooth cutting course of a PDC drilling bit is studied. The research is of great significance for improving PDC drilling bit design.
例如钻头的几何形状及尺寸精度是以精密投影机检验。
A projector is applied to inspect the drill geometry and dimensional accuracy.
骨科类钻头，工具可以按客户提供的尺寸图、或者样品生产。
Orthopedic drill tool can be served according to the specific drawing size or sample.
PD C切削齿尺寸、后倾角和布齿密度是影响PD C钻头性能的重要设计参数。
PDC cutter size, back rake and density are very important design parameters affecting the performance of PDC bit.
PD C切削齿尺寸、后倾角和布齿密度是影响PD C钻头性能的重要设计参数。
PDC cutter size, back rake and density are very important design parameters affecting the performance of PDC bit.
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