| Message: | Last weekend, Boris from Russia left a message on the website of hydraulic manifold manufacturer AAK: I have followed your article about valve hole accuracy 2μm for hydraulic manifolds. How does AAK do the precision machining? After communication, we learned that Boris is an engineer from a hydraulic manifold manufacturer in Russia, who also purchases from Chinese hydraulic manifold manufacturers. Although their supplier also has German Gehring high-precision CNC honing machines like AAK, there are still a small number of valve holes that do not meet the accuracy standards, which makes him very distressed.
This is a very interesting message. Boris seems to be learning from hydraulic manifold manufacturer AAK and doesn't seem to believe it very much. I asked Boris if he knows how his supplier checks the accuracy of valve holes after precision machining. I sent him a video of AAK valve hole accuracy testing. 3 days later, Boris replied that his original supplier did not have such testing equipment.
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