Patent 7007382 was granted and assigned to United Technologies on March, 2006 by the United States Patent and Trademark Office.
A method for cutting a blade root retention slot in a turbine engine disk element includes forming a precursor slot in the element. The precursor slot has first and second sidewalls and a base. A rotating bit is passed through the precursor slot to machine the base. The bit rotates about an axis off-normal to a direction of passing.