Radial bearing system for ball nut and screw assembly

A method of manufacturing a ball nut and screw assembly comprising:

• providing a screw internally into a nut such that said nut is received on the screw;
• forming a first raceway having a helical portion by forming a concave groove in the external surface of the screw and a concave groove in the internal surface of the nut such that said first raceway is formed between said concave grooves of said nut and screw and such that adjacent concave grooves of both of said nut and screw provide said helical portion;
• providing a first plurality of balls in said first raceway, and said method further comprising providing a first radial outboard raceway at a first end of said first raceway and a second radial outboard raceway at a second end of said first raceway;
• forming said first radial raceway between a concave groove formed in a first outboard component and the outermost, external surface of the screw that is in a position between said adjacent grooves of said screw;
• forming said second outboard radial raceway between a concave groove formed in a second outboard component and the outermost, external surface of the screw that is in a position between said adjacent grooves of said screw;
• providing at least a first bearing ball in said first radial outboard raceway and at least a second bearing ball in said second radial outboard raceway;
• and
• forming said external surface of the screw that provides said second radial outboard raceway such that it is concave.