An Multi-Axis Spindle for Automated Coaxial Alignment
Coaxial alignment is an important process in the machining of cylindrical-shape miniature components with an inner bore. It requires aligning the axis of the inner bore with respect to the machine rotational axis precisely. In this paper, we present a spindle with automated coaxial alignment capability for machining applications of the components such as ferrules and capillaries. This spindle includes a novel orientation-adjustable mechanism and a vision-guided feedback system. The adjustment mechanism consists of two pieces of flexural bearings, which can provide the spindle with 4 DOF adjustments without any backlash. The vision-guided feedback system comprises the component face image processing and the through-bore light intensity processing, both of which provide the information of translational and angular offsets. A prototype of the spindle was built to verify the technology we developed. The results show that the system can achieve superior coaxial alignment performances.
Jianhong Zhao, Masanori Kunieda, Guilin Yang and Xue-Ming Yuan
W. J. Chen et al., "An Multi-Axis Spindle for Automated Coaxial Alignment", Key Engineering Materials, Vols. 447-448, pp. 503-507, 2010