Abstract: The ratio of stock removal to tool wear (G ratio) of an abrasive tool having a copper-tin bond alloy with diamond abrasive grit dispersed therein is more than doubled when honing cast iron by including titanium carbide particulate in the bond alloy in an amount of about 0.5 weight percent to less than 20 weight percent, preferably from about 1 to 5 weight percent, based on the total weight of copper and tin.

Abstract: An expandable abrasive tool is provided with an axially-extending slot receiving a single abrasive element and multiple axially aligned and axially spaced apart pockets located circumferentially from the slot with each pocket fixedly receiving an individual centering element for properly positioning and supporting the abrasive element in the hole. The axially spaced apart pockets space the centering elements apart in end-to-end relation and thereby allow torsional flexing of the tool body during hole machining without damaging the brittle centering elements. In an alternative version, multiple centering elements are received in spaced apart end-to-end relation in a single axially elongated slot instead of in individual pockets.

Abstract: A bore sizing machine of the type having a plurality of single pass abrading tools with a preset single pass cutting diameter progressively increasing from one tool to the next is provided. Each abrading tool includes a wear compensation shaft threadably coupled at one end to an axially slidable tapered arbor inside the tool body and driven at the other end outside the tool body by a stepping motor or other drive device to slide the arbor relative to abrading device carried on the arbor or tool body to return a worn tool diameter to the original preset single pass cutting diameter, preferably in response to a signal from wear sensing and signaling devices.

Abstract: A honing tool having an elongated tubular body adapted to be supported for rotational movement about a longitudinal axis in a bore of a workpiece, and adapted for reciprocation in said bore. A transverse slot is formed in said body for the reception of a pair of diametrically disposed honing stones, and wherein the outer face is convexly formed. A spring biased retainer means is mounted in said body for individually retaining each of said honing stones longitudinally in said body. An expansion wedge-like cam means is operatively mounted in said body for pushing the honing stones outwardly into an operative honing engagement with the surface of a bore in a workpiece. Each of the honing stones includes an elongated, inverted T-shaped holder having a raised central front portion and which is formed with a rear flat face in which is formed at least one rectangularly shaped recess that communicates with an inclined expansion angle or inclined surface.