Disposable abrasive wheel having disposable mounting hub including improved metal pressure cap and method of manufacturing the same

摘要

A disposable abrasive wheel for mounting on a rotatable threaded spindle of a power tool. The abrasive wheel contains a retaining nut on one side and a backing member on the other side non-removably secured together on the abrasive wheel without the aid of adhesives in such a manner that the abrasive wheel is placed in compression when it is operably secured upon the spindle of the power tool under operative loads. A metal pressure cap extends outwardly from the backing member and has an upper flat surface for engaging a should formed on the spindle of the power tool during operation of the finishing article. The metal pressure cap includes an inner surface defining a plurality of grooves. A peripheral wall extends upwardly from the retaining nut into the pressure cap and includes portions thereof disposed within said grooves.