Abstract: An improved grinding wheel support arrangement in a grinding machine. The support arrangement includes a support table on which a first post is threadably mounted in a direction normal to the support table. A pair of second posts is fixedly mounted on the support table at a predetermined distance from the first post. A first support shaft is rotatably mounted in the pair of second post by means of a pair of tapered roller bearings. A second support shaft is rotatably mounted in the housing also by means of a pair of tapered roller bearings. An intermediate member is respectively fixedly connected at its opposite ends to said first and second support shafts. A grinding wheel shaft is rotatably mounted in the housing and a grinding wheel is coaxially mounted on the grinding wheel shaft. The first post is connected to the grinding wheel shaft so as to permit its free rotation but also so as to determine its position relative to the support table.

Abstract: An improved grinding wheel support arrangement in a grinding machine. The support arrangement includes a support frame on which a support member is pivotally mounted at one of its free ends. A support leg is pivotally mounted on the support member at the other free end. A grinding wheel shaft supporting a grinding wheel is rotatable on the support leg. At least two separate adjusting means are operatively connected to the support frame; a first adjusting means being directly connected to the support frame and the second adjusting means being connected to the support leg to adjust the position of the grinding wheel relative to the support frame. The two separate adjusting means act in the plane of the grinding wheel in mutually intersecting directions.

Abstract: A method of and machine for point grinding drills by supporting the drill to be pointed in a relatively fixed position and thereafter moving the drill and a bevelled grinding surface relative to each other while rotating the drill about its axis, and by selecting a point of grinding engagement with the bevelled grinding surface a desired lip relief angle may be ground on the drill tip along with a chisel edge angle and a point angle.

Abstract: In a grinding or milling machine an improved clamping arrangement for holding one end of a tool blank having a portion with at least four sides in cross-section. The other end of the tool blank is held against a stationary holding member. The clamping arrangement includes a housing which is coaxially mounted on a drive shaft. A pair of clamping members are reciprocally mounted in the housing and are biased outwardly by means of a pair of coil springs. Each clamping member has a skewed planar surface at its free end. The skewed planar surfaces biasingly engage opposite edges of the tool blank so as to compensate for any misalignment of the tool blank with respect to the holding member and clamping arrangement.