An accumulated wear amount calculation section calculates a wear amount of a blade edge of a punch and a wear amount of a blade edge of a die when a tool set of the punch and the die has processed a sheet metal once. The accumulated wear amount calculation section calculates an accumulated wear amount of the blade edge of the punch and an accumulated wear amount of the blade edge of the die by accumulating wear amounts of respective times when the tool set has processed the sheet metal multiple times. A tool management information managing section manages a state of the blade edge of each punch and each die by causing a tool management information storage section to store tool management information associating a tool identification code given to each punch and each die with the accumulated wear amounts calculated by the accumulated wear amount calculation section.

An electric discharge machining electrode is shaped to form a die for roll forming a dual threaded screw. The electrode is oriented with a face thereof adjacent to a forming surface of the die and placed within an electric discharge machine to cause electric discharge via the electrode to the forming surface of the die, to shape the die to have the geometry required for roll forming of the dual threaded screw. The EDM electrode face has a plurality of troughs and tips substantially matching coarse threads of the screw. Grooves are formed in the tips. The grooves are angled relative the tips and have a geometry substantially matching the fine threads of the screw. The face of the electrode has a form which shapes the forming surface of the die so that the die can roll form the dual threaded screw.

An axe jig for use when grinding an axe, the axe jig comprising a first and a second clamp portion to be arranged on opposite sides of an axe head of the axe and configured such that the axe jig is attachable to the axe head. The first clamp portion comprises a first support surface for positioning the axe head during grinding and the second clamp portion comprises a second support surface for positioning the axe head during grinding. A grinding system comprises the axe jig and a grinding machine.

A portable tool sharpener adapted for mounting on a rail such as may be found on various weapons includes a sharpener body in which a plurality of sharpening tools are mounted and a rail-mounting base pivotally mounted to the sharpener body to allow the body to moved selectively to a closed and open position, wherein the rail-mounting base is releasably engageable with a rail mounted on a weapon, a handle or a fixed pad.

A portable tool sharpener adapted for mounting on a rail such as may be found on various weapons includes a sharpener body in which a plurality of sharpening tools are mounted and a rail-mounting base pivotally mounted to the sharpener body to allow the body to moved selectively to a closed and open position, wherein the rail-mounting base is releasably engageable with a rail mounted on a weapon, a handle or a fixed pad.

An apparatus for sharpening the head of a screwdriver is disclosed. The apparatus includes a grinder stone having a grinding surface for engaging the one or more front surfaces of the head of the screwdriver for grinding the one or more front surfaces, and a rotor coupling to the grinder. The rotor, in response to a press force applied from the head of the screwdriver to the grinder stone, rotates the grinder stone for grinding the one or more front surfaces of the head of the screwdriver.

An apparatus for sharpening the head of a screwdriver is disclosed. The apparatus includes a grinder stone having a grinding surface for engaging the one or more front surfaces of the head of the screwdriver for grinding the one or more front surfaces, and a rotor coupling to the grinder. The rotor, in response to a press force applied from the head of the screwdriver to the grinder stone, rotates the grinder stone for grinding the one or more front surfaces of the head of the screwdriver.

The chainsaw guide bar straightener has a flat table having a length of about of the nominal length of a chainsaw guide bar, and a clamp on one corner of the table. The clamp is used for pressing the guide bar down against the table along a diagonal of the guide bar, for better measuring deformation in the guide bar. In another aspect, the chainsaw guide bar straightener has a pair of spaced apart anvil posts mounted to the frame thereof. These anvil posts define an open space there between. The chainsaw guide bar straightener further includes an hydraulic cylinder mounted to the machine frame. The hydraulic cylinder has a rod end head being movable along a working axis extending between the anvil posts and being centered with the open space, for straightening a chainsaw guide bar that is positioned between the rod end head and the anvil posts.

The chainsaw guide bar straightener has a flat table having a length of about of the nominal length of a chainsaw guide bar, and a clamp on one corner of the table. The clamp is used for pressing the guide bar down against the table along a diagonal of the guide bar, for better measuring deformation in the guide bar. In another aspect, the chainsaw guide bar straightener has a pair of spaced apart anvil posts mounted to the frame thereof. These anvil posts define an open space there between. The chainsaw guide bar straightener further includes an hydraulic cylinder mounted to the machine frame. The hydraulic cylinder has a rod end head being movable along a working axis extending between the anvil posts and being centered with the open space, for straightening a chainsaw guide bar that is positioned between the rod end head and the anvil posts.

A cutting tool (2) is specified with a cutting region (4) that comprises a substrate (12) onto which a coating (10) is applied, which coating (10) is subsequently processed, whereby a sharp cutting edge (8) is formed. Furthermore, a corresponding method for the manufacture of the cutting tool (2) is specified. By means of the sharpening of the cutting edge (8) after the coating rather than before, a particularly sharp cutting edge (8) is formed, whereby the precision of the cutting tool (2) as well as its service life is improved.