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The article envisages the increase in the efficiency of NC machine tool due to the use of an upgrades design of turning table for installation and fixing of workpieces, the use of which will lead to improved productivity of machining. With the help of a turning table it is possible to perform machining of workpieces of different shapes from several sides without resetting, and to rotate the workpiece in different coordinates to carry out other technological transitions. Such tables are widely used un multi-position hole machining, milling planes on drilling and milling machines. The workpiece is fastened to the turning table by T-shaped longitudinal seams, and the table can take vertical or horizontal position. Ways to reduce the cost of CNC equipment for small enterprises are analyzed. One possible way is to modernize turning tables by replacing the manual drive.  When upgrading the table for replacement of the manual drive a stepper motor is installed, which transmits the movement through the coupling and worm-and-worm gear to the faceplate. Modern stepper electric motors provide movement of the work part with an accuracy of 0.01 mm. In addition, the have good operational life due to the lack of a collector unit (in comparison with servo drives), which is subject to considerable wear during operation. Due to the simplicity of design stepper motors have relatively low cost, which is of great importance in today’s production realities. The analysis of operating life and accuracy of modern stepper motors and the choice of motor was carried out. For integration of the modernized table into the system of CNC metal-cutting machine tool the function of command reading sent from the machine control rack and converting them into the direction (DIR) and pitch (PULSE) is proposed to solve this problem. The effect of changing the design of the positioning mechanism on accuracy control is also shown.

MODERNIZATION OF THE TURNING TABLE FOR NC MACHINE TOOL