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US 2018/0177054 A1Published application
Drill bit for use in forming holes in printed circuit boards
AssigneePerfect Point Precision Carbide Tools Inc.
InventorShane Hugh STEWART
Life of this patent
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Abstract
A drill bit for use in forming holes in a printed circuit board (PCB) is disclosed. The drill bit includes a drill bit body having: a drill bit tip at a first end of the drill bit body; a flute winding about the drill bit body in a helix, wherein a helix angle of the flute is between 44 and 46 degrees in the vicinity of the first end and increases with increasing distance from the first end to between 49 and 51 degrees; and a land width of between 0.08 and 0.1 millimeters.
Claims16
A drill bit for use in forming holes in a printed circuit board (PCB), the drill bit comprising:
- a drill bit body having:
- a drill bit tip at a first end of the drill bit body;
- a flute winding about the drill bit body in a helix, wherein a helix angle of the flute is between 44 and 46 degrees in the vicinity of the first end and increases with increasing distance from the first end to between 49 and 51 degrees;
- and
- a land width of between 0.08 and 0.1 millimeters,
- wherein the drill bit body has a web thickness of between 0.08 and 0.12 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 0.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.09 and 0.13 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 0.7 millimeters,
- and wherein the drill bit body has a web thickness of between 0.115 and 0.155 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 1.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.13 and 0.17 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 2.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.175 and 0.215 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 4.5 millimeters.
7 more elements
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A method of forming holes in a printed circuit board (PCB), comprising:
- providing a drill bit including a drill bit body having:
- a drill bit tip at a first end of the drill bit body;
- a flute winding about the drill bit body in a helix, wherein a helix angle of the flute is between 44 and 46 degrees in the vicinity of the first end and increases with increasing distance from the first end to between 49 and 51 degrees;
- and
- a land width of between 0.08 and 0.1 millimeters,
- rotating the drill bit;
- bringing the drill bit tip into contact with a surface of the PCB;
- and
- forming a hole in the PCB by moving at least one of the drill bit and the PCB in a direction parallel to the longitudinal axis of the drill bit such that the drill bit penetrates through the PCB,
- wherein the drill bit body has a web thickness of between 0.08 and 0.12 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 0.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.09 and 0.13 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 0.7 millimeters,
- and wherein the drill bit body has a web thickness of between 0.115 and 0.155 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 1.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.13 and 0.17 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 2.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.175 and 0.215 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 4.5 millimeters.
11 more elements
A drill comprising:
- a drill body;
- a drill bit including a drill bit body having:
- a drill bit tip at a first end of the drill bit body;
- a second end which is attachable to the drill body, the second end being opposite the first end;
- a flute winding about the drill bit body in a helix, wherein a helix angle of the flute is between 44 and 46 degrees in the vicinity of the first end and increases with increasing distance from the first end to between 49 and 51 degrees;
- and
- a land width of between 0.08 and 0.1 millimeters, and
- a fastening mechanism for attaching the second end of the drill bit body to the drill body,
- wherein the drill bit body has a web thickness of between 0.08 and 0.12 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 0.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.09 and 0.13 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 0.7 millimeters,
- and wherein the drill bit body has a web thickness of between 0.115 and 0.155 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 1.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.13 and 0.17 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 2.5 millimeters,
- and wherein the drill bit body has a web thickness of between 0.175 and 0.215 millimeters at a point on the drill bit that is axially spaced from the drill bit tip by 4.5 millimeters.
10 more elements
Dependencies are inferred from the claim text.