Technically, it is still the strongest in the United States. Germany and Japan have done a good job in the industrialization of precision CNC machine tools, but the truly top ultra-precision machine tools are all laboratory goods and will not be commercialized. LODTM large diamond lathe is a product of 1980s and a masterpiece of LLNL laboratory. Workpieces with a diameter of 2. 1m and a weight of 4.5t can be machined, and the straightness error is less than 25nm, which still maintains the record of the highest machining accuracy in the world. Ultra-precision optical processing, including Hubble telescope lens, laser gyro plane emitting mirror of American warship, infrared missile mirror, missile inertial device and controlled laser fusion mirror, basically come from this laboratory.
The representatives of the highest level of machine tools in the world are Britain and the United States, not Germany and Japan. The first ultra-precision machine tool was invented by a British university. So far, it is called the world's three largest ultra-precision machine tool research institutions together with two other institutions in the United States, and Germany and Japan often buy their patents. Otherwise, how can American Pratt & Whitney and general aviation engines be made? There are no Japanese or Swiss machine tools in these fields, and Americans must be their own.