Non-axisymmetric tube spinning by offset rotation

A spinning method has been devised to produce an offset tube using a conventional lathe and a simple roller. By using a standard boring head in the chuck of a lathe the axis of rotation relative to the tube’s axis can be modified, enabling an offset tube to be produced. Offset tubes have been produced in pure copper with varying amounts of offset and variations in key spinning parameters, including number of spinning passes, feed ratio, radial reduction and axial step per pass, and taper angle. This study has demonstrated that it is possible to produce an offset tube cheaply, without using costly and specialized spinning equipment.