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Rotary tables are equipments in precision machinery applied in five-axis Machine Tools and CMM (Coordinate Measuring Machines), offering rotational (C-axis) and tilting motion (A-axis), allowing the obtaining of several configurations for manufacturing or inspection of parts with complex geometries. The demand for high accuracy, high efficiency and fewer errors in the positioning of the part in precision machines increases every day, thus ensuring their high confidence and the use of aerostatic bearings enable constructive innovations to the equipment. In this context, this work presents the mechanical design, the development and error analysis of a prototype of an aerostatic rotary table. This study emphasizes the analysis of a prototype that uses the air as a working principle for reducing friction between moving parts, increasing the mechanical efficiency, and its influence of motion error is also discussed based on the experimental results. For the geometrical errors analysis, experimental tests were realized in laboratory using a DBB (Double Ballbar). The tests are performed with only one axis moving, observing the behavior of the system for different feedrate at the C-axis.

Design, Development and Geometric Error Analysis of an Aerostatic Rotary Table