In direct-drive hobbing machine

the radial thermal deformation of the wokepiece spindle has an important effect on the helix deviation of gear tooth.The radial and axial thermal deformations of the hob spindle have a great effect on pitch deviation and helix deviation.The best way to testify the effect of machine tool on the machining precision is experiment.At last

the control technology of the thermal deformation on the machine tool

including structure optimization and error compensation is studied.