By combining pressurized fluid journal bearings with a novel magnetic thrust bearing, a rotary-axial spindle design is presented to achieve both rotary motion for cutting and mm-range linear motion along the axial direction for feeding. The advantages of such rotary-axial spindles include stiffer structure loops, fewer components, higher accuracy and resolution, and less heat generation. Our first prototype has demonstrated 9000 rpm, 600 N axial load capacity, 100 N/μm dynamic stiffness, 1 mm axial stroke, and 5 nm resolution. These are significant improvements over aerostatic spindles of comparable size.
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机译：通过将加压流体轴颈轴承与新型电磁推力轴承相结合，提出了一种旋转轴向主轴设计，以实现切削的旋转运动和进给轴向的毫米范围线性运动。这种旋转轴向主轴的优点包括更硬的结构环，更少的组件，更高的精度和分辨率以及更少的热量产生。我们的第一个原型已经证明了9000 rpm，600 N的轴向负载能力，100 N /μm的动态刚度，1 mm的轴向行程和5 nm的分辨率。这些是同等尺寸的空气静力锭子的重大改进。
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