High-speed spindle unit for machine tools

摘要

High speed spindle unit for cutting and drilling machine tools comprises a spindle housing (4) having a front bushing (8) removably fixed to the front end part and a rotating driven tool spindle (1) positioned in at least one front roller bearing (2) and having a threaded ring (26) fixed to its front end. A pre-dimensioned annular groove (29) formed between the front bushing and the threaded ring extends in the radial direction and its width drops toward zero on increasing the axial loading of the spindle. Preferred Features: An accurately dimensioned peripheral groove (30) is formed between a spacer ring (25) fixed on the spindle in front of the front roller bearing and the front bushing and its width drops toward zero on increasing the radial loading of the spindle.