Abstract: A clamping device for a grinding disk. The apparatus permits balancing and detachable fastening of a grinding ring on a driving shaft so that it excludes distorting and damaging of the grinding ring. For this purpose the supporting portion of a support flange of the driving shaft and the grinding ring are provided with interacting guiding means.

Abstract: The threaded portion of a tap drill is formed by mounting a tool blank for rotation about a longitudinal axis and mounting first and second grinding wheels integrally for rotation about a common second longitudinal axis parallel to the longitudinal axis of the tool blank. The tool blank and a first grinding wheel are rotated about the respective longitudinal axes thereof while moved longitudinally with respect thereto, thereby employing grinding ribs of the first grinding wheel to form threads in the blank. The second grinding wheel then is moved closer to the blank and a smooth peripheral surface of the second grinding wheel grinds away outer portions of the threads at an end portion of the tool blank, thus forming a tapered starting end of the tool.

Abstract: An apparatus for forming a saw blade or saw band by forming saw teeth in a solid stock moving continuously in a longitudinal direction includes a grinding wheel mounted for rotation about an axis which is inclined at an acute angle to and which diverges from the direction of movement of the stock. The grinding wheel has a generally frusto-conical configuration and an outer periphery defined by first and second axially distinct helical grinding ribs having different contours.

Abstract: An apparatus for forming a saw blade or saw band by forming saw teeth in a solid stock moving continuously in a longitudinal direction includes a grinding wheel mounted for rotation about an axis which is inclined at an acute angle to and which diverges from the direction of movement of the stock. The grinding wheel has a generally frusto-conical configuration and an outer periphery defined by first and second axially distinct helical grinding ribs having different contours.

Abstract: A lathe dog has a floating pendulum disc (D) held in a rotatable holder (H) associated with one center point (B) for a workpiece (A). Such holding is shown to be in a slot (G) by an extension finger (K) engaging spherical contacts (G'). The disc (D) has a central interiorly conical (F', F") carrier (F) to engage on and be pressed (springs E) against the workpiece (A) and permit tilting thereof.

Abstract: A grinding disk for forming a spur gear includes a single integral disk member having a grinding surface including a finish grinding tooth and a pre-grinding tooth. The finish grinding tooth has a profile corresponding to the desired configuration of the flanks of adjacent teeth and the tooth gap therebetween for a given spur gear to be formed. The pre-grinding tooth has a profile formed by curved surfaces only. The finish grinding tooth and the pre-grinding tooth are spaced by distance equal to one tooth pitch between adjacent teeth of the spur gear to be formed.

Abstract: A shaping roll for forming a grinding wheel of a longitudinal-feed thread grinding machine used for the manufacture of threads including a conically tapered first thread portion and a cylindrical second thread portion includes a first groove having flank and radius configurations corresponding to the conically tapered first thread portion to be formed, a first cylindrical end surface adjacent the first groove and having a first diameter, a second groove having flank and radius configurations corresponding to the cylindrical thread portion to be formed, and a second cylindrical end surface adjacent the second groove and having a second diameter. The depth of the first groove is less than the depth of the second groove.

Abstract: A profiling roller for producing a profile on a grinding wheel used in a thread grinding machine operating with longitudinal feed (along the axis of the rotating wheel) having a central finishing roller rib of size and configuration corresponding to the thread to be produced, said finishing rib being flanked with preliminary roller ribs of progressively decreasing height and width and arranged symmetrically with respect to the finishing rib toward the ends of the roller. The dimensions of the progressively smaller ribs compared with the finishing rib are geometrically defined in the specification in terms of root radii, flank angle and pitch circle radii.