直径小于3.175mm的钻头，通常称为微型钻头，简称微钻。要使微钻在使用中发挥高效率，必须考虑一系列因素：如钻头本身的各项要素、加工参数、孔深、安装的完善性及工件的结构等。
微型钻头磨床砂轮轴振动严重地影响了钻头加工精度。
The machining accuracy of microbit is worse for the vibration of grinding wheel spindle.
分析了硬质合金微型钻头加工时的受力状态，根据钎焊硬质合金刀具的强度指标要求，研究了刀具焊接强度的检测方法。
The cutting loads of cemented carbide drilling tool in drilling PCB are analyzed, a method applied to testing the brazing strength of cemented carbide cutters is studied.
在这两种晶体结构之间是较薄弱的有机物质。科学家们用微型金刚钻头探头敲击海胆牙齿，发现这些牙齿沿着有机物质层发生断裂。
Between the crystals are layers of weaker organic material. By striking the teeth with microscopic, diamond-tipped probes, the scientists found that the teeth break along these organic layers.
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