| 摘要 |
The numerically controlled lathe is intended for the subsidiary operation, through this control, of the machining of a complex shape such as the non-circular section of the turned part, especially the section of a skirt of an internal combustion engine piston or the elliptical helical oil groove of a bearing of the carriage 41. For this purpose, the lathe comprises: - an extra tool-holder mounted on the carriage support by way of an actuator 54 capable of imparting a rapid motion of displacement to the extra tool-holder along a predetermined direction R with respect to the axis of the spindle, - a sensor 55 of position of the extra tool-holder along the said predetermined direction R and - an additional servocontrol loop 130 with wide passband for controlling the position of the extra tool-holder as a function of information provided by a profile memory 102 associated with the numerical control circuit 100 and comprising data relating to a particular profile to be machined as a function of the angular position of the part-holder spindle. <IMAGE>
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