Hand tool having deburring and beveling bit

Abstract

A hand tool for deburring and beveling the edge of a part includes a small, hand-held driving tool coupled to a shaft on which are mounted a rotatable cutting blade and a pair of roller bearings of conventional, cylindrical configuration on opposite sides of the cutting blade. The cutting blade is secured for rotation with the shaft by a nut mounted on a threaded outer end of the shaft to compress the inner races of the roller bearings against the cutting blade and against an annular shoulder on the shaft. Upon placement of the pair of roller bearings against opposite sides of a part having an edge to be deburred and beveled, the driving tool rotatably drives the shaft and thus the cutting blade so as to accomplish the desired deburring and beveling action. The depth of beveling along the edge of the part is determined by size and shape of the cutting blade, the diameter of the pair of roller bearings and the space therebetween. For a given spacing, the beveling depth is varied by selecting roller bearings of appropriate diameter. Conversely, for roller bearings of given diameter, the depth of beveling is selected by varying the space between the pair of roller bearings. This is accomplished by mounting one or more disk-shaped spacers on each side of the cutting blade between the cutting blade and the adjacent pair of roller bearings. The shaft with included cutting blade and roller bearings is provided as a bit assembly, with the shaft being mounted in a chuck of the driving tool.