![]() Prior to the launch of MJN, Yoshimura Japan has invested in new tools and equipment including a CNC (computer numerical control) lathe that was specially designed for producing MJN tubes by boring into brass billets. Well, it took us quite a lot of time to develop, and that's because we were trying to build a durable product that would withstand not only the hours of racing abuse but also the rigors of street use.” The micro-drill bits are fixed to the high precision machine tools in the factory. We've also tried various combinations of holes in different positions, sizes and numbers - followed by determining the clearance between the MJN and its guide, verification of their material, surface treating, wear properties - and the list goes on. We've tried all kinds of machining including laser drilling - and ultimately found out that the best way to make these microscopic holes is with mechanical micro-drill bits since they provide the highest precision and cleanest cut. ![]()
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