International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The article illustrates how, taking into account the achievements in science and technology, the kinematic chain from the driving force (engine) to the executive body (spindle) was shortened and became the shortest in the form of a motor-spindle. On the examples of lathes and milling machines, places of possible limitation of spindle rotation frequencies are highlighted. A self-acting motor-spindle, which has rotary and translational motion, is proposed.