Abstract: A tool manufactured by brazing a hard sintered body such as a diamond or cBN to a tool substrate through a bonding layer comprising at least one of Ti and Zr by 15-65 wt % and Cu. Two ridges of the tool substrate on both sides each has a first ridge adjacent to and aligned with a ridge of the hard sintered body and a second ridge provided nearer to an inscribed circle of the tool than is the ridge of the hard sintered body. Also, an upright side face and a bottom of each seating groove formed in the tool substrate intersect each other at an angle smaller than the intersecting angle between a back side and a bottom of each hard sintered body.

Abstract: An electromagnetic workpiece positioning and holding device is mountable on a metal working lathe for pulling bar stock to a working position relative to metal working tools and/or for holding and stabilizing an outermost end portion of a workpiece during a cut-off operation. The coil of the electromagnet is in an electrical circuit with a 24 volt power supply and a control switch by which the coil is connected to and disconnected from the power supply.

Abstract: A rotary milling cutter body includes a plurality of inserts positioned at a positive axial angle and a negative radial angle. Shims are disposed behind respective inserts. One of the shims is thinner than the other shims (e.g., by 20-150.mu.m) so that the insert associated with the thinner shim has a greater axial projection than the other inserts. If shims are not used, one of the inserts could be thinner than the other inserts to achieve the same effect.

Abstract: A spiral drill includes a rear shank portion; a front tip; and a spiral (helical) middle portion extending therebetween. Spiral ribs are formed in the middle portion, and coolant channels extend through the drill to the tip for conducting coolant fluid. The coolant channels form exit openings in the tip which are spaced at different radial distances from a centerline of the drill. Each coolant channel extends spirally through a respective rib, and the portion of each coolant channel disposed in the shank is straight. Those straight portions are spaced by different radial distances from the centerline.