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A honing tool for honing holes in workpieces, having an abrasive portion including a first abrasive layer therearound of abrasive particles of a first size, including a region having a second abrasive layer of abrasive layers of a second size sufficiently smaller than the first size, so as to be dis

A honing tool for honing holes in workpieces, having an abrasive portion including a first abrasive layer therearound of abrasive particles of a first size, including a region having a second abrasive layer of abrasive layers of a second size sufficiently smaller than the first size, so as to be disposed in interstices between abrasive particles of the first abrasive layer without altering the diametrical size of the first layer, and so as to provide enhanced wear resistance.

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1. A honing tool for honing a substantially cylindrical surface extending around and defining a hole in a workpiece, the tool comprising: an elongate radially expandable tubular member having a mounting end configured for attaching to a honing machine, and an opposite free end portion configured to

1. A honing tool for honing a substantially cylindrical surface extending around and defining a hole in a workpiece, the tool comprising: an elongate radially expandable tubular member having a mounting end configured for attaching to a honing machine, and an opposite free end portion configured to be insertable into the hole in the workpiece, the tubular member including a radially outwardly facing outer cylindrical surface;at least one expander member located within the tubular member and movable relative thereto for radially expanding the tubular member in the hole of the workpiece; andwherein the outer cylindrical surface of the tubular member includes a longitudinally extending region thereabout including a first layer of abrasive particles of a first size bonded thereto, and wherein only a longitudinally limited portion of the first layer of the abrasive particles of the first size has a second layer of abrasive particles bonded thereto, substantially all of the abrasive particles of the second layer having a second size which is equal to about one-half the first size, and being located at least substantially within interstices between the particles of the first layer, such that the region of the outer cylindrical surface has a substantially uniform outer diameter. 2. The honing tool of claim 1, wherein substantially all of the interstices between the particles of the first layer in which the particles of the second layer are located, are located at least substantially radially outwardly of radial centers of the particles of the first layer, respectively. 3. The honing tool of claim 1, wherein the limited portion of the first layer comprises an end portion of the first layer. 4. The honing tool of claim 1, wherein the limited portion of the first layer comprises an end portion of less than about one-fourth of an overall longitudinal extent of the first layer. 5. The honing tool of claim 1, wherein the first size is within a range of from about 0.10 millimeter to about 0.20 millimeter, and the second size is within a range of from about 0.05 millimeter to about 0.10 millimeter. 6. The honing tool of claim 1, wherein the first size is within a range of from about 0.20 millimeter to about 0.30 millimeter, and the second size is within a range of from about 0.10 millimeter to about 0.15 millimeter. 7. The honing tool of claim 1, wherein the particles of the first size are bonded to the tubular member by a first layer of a binder, and wherein the particles of the second layer are bonded to the first layer of the binder by a second layer of a binder. 8. The honing tool of claim 7, wherein the binders comprise plating. 9. The honing tool of claim 1, wherein the free end portion of the tubular member is split to facilitate expansion thereof. 10. The honing tool of claim 1, wherein the particles of the first size of the first layer are distributed in a maximum particle concentration over the region of the outer cylindrical surface of the tubular member. 11. A honing tool for honing a cylindrical surface extending around and defining a hole in a workpiece, the tool comprising: an elongate radially expandable tubular member having a mounting end configured for attaching to a honing machine, and an opposite free end portion sized in a retracted state to be insertable into the hole in the workpiece and radially expanded therein, the tubular member including a radially outwardly facing outer cylindrical surface, and a radially inwardly facing inner tapered surface defining a passage extending axially within the tubular member;an elongate expander member having a mounting end configured for attaching to the honing machine, and an opposite free end portion located in the passage of the tubular member and having an outwardly facing outer tapered surface engaged with the inner tapered surface of the tubular member and movable longitudinally relative thereto for radially expanding the tubular member; andwherein a predetermined longitudinal extent of the outer cylindrical surface of the tubular member adjacent to the free end portion includes a first layer of abrasives of a first size bonded thereto, and wherein only an endmost portion of the first layer of the abrasives adjacent to the free end portion and comprising less than one-half of the longitudinal extent includes a second layer of abrasive particles bonded thereto, substantially all of the abrasive particles of the second layer having a second size sufficiently smaller than the first size such that substantially all of the particles of the second size are located only within interstices between the particles of the first size, such that the layers of the abrasives have a substantially uniform outer diameter along substantially the entire longitudinal extent. 12. The honing tool of claim 11, wherein the second size is less than or equal to about one-half of the first size. 13. The honing tool of claim 12, wherein the first size is within a range of from about 0.10 millimeter and about 0.30 millimeter, and the second size is within a range of from about 0.05 millimeter and about 0.15 millimeter. 14. The honing tool of claim 11, wherein the endmost portion comprises less than about one-fourth of an overall longitudinal extent of the first layer. 15. The honing tool of claim 11, wherein the abrasive particles of the first layer are bonded to the tubular member by a first layer of a binder, and wherein the particles of the second layer are bonded to the first layer of the binder by a second layer of a binder. 16. The honing tool of claim 15, wherein the binders comprise plating. 17. The honing tool of claim 11, wherein the abrasives are selected from a group consisting of natural diamonds, synthetic diamonds, cubic boron nitrides, and superabrasives. 18. A honing tool for honing a cylindrical surface extending around and defining a hole in a workpiece, the tool comprising: an elongate radially expandable tubular member having a mounting end configured for attaching to a honing machine, and an opposite free end portion sized in a retracted state to be insertable into the hole in the workpiece and radially expanded therein, the tubular member including a radially outwardly facing outer cylindrical surface, and a radially inwardly facing inner tapered surface defining a passage extending axially within the tubular member;an elongate expander member having a mounting end configured for attaching to the honing machine, and an opposite free end portion located in the passage of the tubular member and having an outwardly facing outer tapered surface engaged with the inner tapered surface of the tubular member and movable longitudinally relative thereto for radially expanding the tubular member; andwherein at least a portion of the outer cylindrical surface of the tubular member adjacent to the free end portion includes a first layer of abrasives of a first size bonded thereto, and a second layer of abrasive particles bonded onto at least a portion of the first layer, substantially all of the abrasive particles of the second layer having a second size sufficiently smaller than the first size such that substantially all of the particles of the second size are located only within radially outwardly facing interstices between the particles of the first size. 19. The honing tool of claim 18, wherein the second size is less than or equal to about one-half of the first size. 20. The honing tool of claim 19, wherein the first size is within a range of from about 0.10 millimeter and about 0.30 millimeter, and the second size is within a range of from about 0.05 millimeter and about 0.15 millimeter. 21. The honing tool of claim 18, wherein the portion of the first layer comprises less than about one-fourth of an overall longitudinal extent of the first layer. 22. The honing tool of claim 18, wherein the abrasive particles of the first layer are bonded to the tubular member by a first layer of a binder, and wherein the particles of the second layer are bonded to the first layer of the binder by a second layer of a binder. 23. The honing tool of claim 22, wherein the binders comprise plating. 24. The honing tool of claim 18, wherein the abrasives are selected from a group consisting of natural diamonds, synthetic diamonds, cubic boron nitrides, and superabrasives.