This thesis focuses on the design of an aerostatic journal bearing for an electro-spindle used in mechanical dicing. The primary objectives are to achieve sub-micron runout (< 0.1 µm), low vibration amplitude, and sufficient radial stiffness without compromising system stability, thereby ensuring high machining accuracy and spindle longevity over a speed range of 20–60 krpm. The design process begins with a static analysis, supported by a sensitivity study to determine suitable initial geometrical parameters—bearing length, diameter, and the number, position, and dimensions of the supply holes. These parameters are optimized to maximize static stiffness while maintaining a reasonable load capacity and air consumption.