Patent ID: 7909548

Claim:
A rotary motion cutting tool having an axis of rotation for use in cutting at least a portion of a spherical surface on an internal surface of a workpiece, the rotary motion cutting tool comprising: at least one rotary slide rotatably supported with respect to a rotary axis extending generally perpendicular to the axis of rotation; at least one rotary actuator rotatably supported with respect to the at least one rotary slide for rotation about a rotary actuator support axis spaced radially from and generally parallel with the rotary axis of the at least one rotary slide; an actuating plate driven in reciprocal movement along the axis of rotation and having at least one rotary surface machined therein for interaction with the at least one rotary actuator, wherein reciprocal movement of the actuating plate translates through the rotary surface and rotary actuator into rotary movement of the rotary slide through an arc about the rotary axis; a sphere positioning body engageable with a force application surface and having a sphere position center at a distal end, the sphere positioning body supporting the rotary slide for rotation with respect to the rotary axis and for rotation with respect to the axis of rotation of the cutting tool; a feed control module supporting the sphere positioning body for rotation therewith, the feed control module moveable axially with respect to the sphere positioning body; and at least one biasing member for urging the sphere positioning body axially away from the feed control module.