Patent ID: 8037785

Claim:
An NC machine tool including a spindle, a main table and an NC device for making a machining relative movement between the spindle and the main table, the NC machine tool comprising: a housing mounted on the main table; an index table supported on the housing for rotation; a push bar extending into the housing and outwardly of the housing for movement; the NC device being arranged to make an extra relative movement between the spindle and the main table other than the machining relative movement, so that the push bar can be pushed and moved longitudinally thereof by the extra relative movement; transmission means received in the housing and disposed between the push bar and the index table to rotate the index table at an angle in response to the movement of the push bar whenever the push bar is moved; a stop connected to and supported by the push bar and moved to a position by the extra relative movement whenever the push bar is moved; and engagement means rotated at an angle in response to the rotation of the index table whenever the index table is rotated, to be engaged with the stop moved to the position, so that the index table can be stopped by the stop, wherein the stop comprises a movable bar moved longitudinally thereof, and wherein the engagement means is engaged with the movable bar moved to the position.