FIELD: machining. SUBSTANCE: actuating electromechanical head has spindle unit mounted on the carriage, drive for feeding the spindle unit, mechanism for protecting a tool against break-down, and control system. The mechanism for protection a tool against break-down is made up as a spring-loaded movable member built in the carriage. The member is provided with contacts of minimum and maximum forces. One portion is mounted for permitting interaction with the rigid stop. The other portion is coupled with the drive of feeding. The contacts are connected to the control system. EFFECT: enhanced reliability. 1 dwg
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