Ball screw resettable mechanical disconnect

A disengagement assembly for disengaging a rotating machine from an accessory, the disengagement assembly comprising:

• a rotatable inner ball screw having an angled threading on an outer surface thereof, the inner ball screw operatively engaged to the rotating machine, the inner ball screw capable of engaging and disengaging the accessory, the accessory distal to the rotating machine;
• an outer ball screw surrounding the inner ball screw;
• an angled ball track between the inner ball screw and the outer ball screw;
• a ball bearing traveling on the angled ball track;
• and
• a brake capable of slowing or stopping rotation of the outer ball screw so that the inner ball screw rotates relative to the outer ball screw along the ball track and slides axially away from the accessory thereby disengaging the rotating machine from the accessory, wherein
• the inner ball screw has axial dog teeth and wherein a drive shaft of the accessory has dog teeth that mate with the axial dog teeth.