Abstract: A hand drilling tool of one or more elements coupled therebetween comprising: a chuck (2) tightened in the spindle of a tool machine allowing the tool rotation; an elongated point body (3) with tool diameter (2) having at least four helical grooves developing longitudinally on the point body and defining at least two primary cutters, and at least two secondary cutters; said two primary cutters forming a tip angle; said secondary cutters having a discharge surface S; said discharge surface S is shaped so as to create an interruption between the secondary cutters and the primary cutters by contributing to reduce the operator's effort, to reduce the temperature and to promote the discharge of the worked material. Said point body (3) is formed by a substantially cylindrical first portion and a substantially conical second portion with taper towards the end of the tool.

Abstract: A hand drilling tool of one or more elements coupled therebetween comprising: a chuck (2) tightened in the spindle of a tool machine allowing the tool rotation; an elongated point body (3) with tool diameter (2) having at least four helical grooves developing longitudinally on the point body and defining at least two primary cutters, and at least two secondary cutters; said two primary cutters forming a tip angle; said secondary cutters having a discharge surface S; said discharge surface S is shaped so as to create an interruption between the secondary cutters and the primary cutters by contributing to reduce the operator's effort, to reduce the temperature and to promote the discharge of the worked material. Said point body (3) is formed by a substantially cylindrical first portion and a substantially conical second portion with taper towards the end of the tool.

Abstract: A drill point (1) for drilling sandwich panels (100), composite materials and similar, comprising a shank (2) for coupling into the chuck a tool apt to drive said point (1) in rotation; a drilling member, integral to the shank, comprising a substantially cylindrical working portion (3), and a cutting head (4), located at the end of the working portion (3), having cutting edges (C); wherein onto the surface of the working portion (3) there are obtained helical flutes (5), spirally arranged about a substantially central longitudinal axis (A-A) of the working portion (3), the flutes (5) ending on a top face (4?) of the cutting head (4), characterized in that the constructive geometry thereof provides a helix angle (?) with respect to the longitudinal axis (A-A), along which there develop the helical flutes (5), substantially comprised in a range of 30° to 35°.

Abstract: A drill point (1) for drilling sandwich panels (100), composite materials and similar, comprising a shank (2) for coupling into the chuck a tool apt to drive said point (1) in rotation; a drilling member, integral to the shank, comprising a substantially cylindrical working portion (3), and a cutting head (4), located at the end of the working portion (3), having cutting edges (C); wherein onto the surface of the working portion (3) there are obtained helical flutes (5), spirally arranged about a substantially central longitudinal axis (A-A) of the working portion (3), the flutes (5) ending on a top face (4?) of the cutting head (4), characterized in that the constructive geometry thereof provides a helix angle (?) with respect to the longitudinal axis (A-A), along which there develop the helical flutes (5), substantially comprised in a range of 30° to 35°; a chisel edge angle (?) substantially comprised in a range of 1° to 5°; a first radial relief angle (?r) substantially of 7°; a second external relief ang