In the mechanical manufacturing, the drilling of small holes is more common, especially the small holes of the watch parts, diesel parts and electronic parts are more prominent. The drilling of small holes not only has a large workload, but also is relatively difficult. The drilling of small holes is difficult, and it is difficult to be small. It is easy to break, and the machining accuracy of small holes is difficult to guarantee. Through many practices and careful analysis and analysis, the main reasons for the damage of small drill bits are as follows. (1) The drill bit has low strength and poor rigidity due to its small diameter.
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