Jim Allen
Well-Known Member
- Joined
- Jun 7, 2005
- Messages
- 1,622
"In drilling operations, the by-products of the rotational energy applied is chips & heat; either high heat & less chips or less heat & more chips. Multi-faceted geometry generates the least amount of heat of all the drill point patterns. In comparing two drills of the same diameter, the multi-faceted drill features 150% less thrust & 70% less heat than a conventional drill."
Four faceted drill points consist of 2 separate cutting lips (primary) & 2 secondary heel clearance lips (relief). Extending the secondary heal clearance reliefs to the midpoint of the drill, produces a self centering point which eliminates center drilling or punching & is much more durable than any type of split point. Carbide faceted drills are excellent for drilling any type of hardened steels, maraging steels & difficult to drill alloys such as piano wire, dowel pins or titanium alloys, etc.. They can easily be re-sharpened, with some practice, even in small sizes (.0625"), with a Dremel diamond disc. Hold the Dremel tool in a small toolmakers vise (15,000 RPM) & hold the drill with both hands using the workbench to support your hands. Set the drill at the angles present on the drill's facets. A very small amount of pressure is required to re-sharpen the facets. I use a 5 power Opti-Visor & a good light source. Keep in mind a freshly sharpened faceted drill can easily drill hardened abrasive metals. If there is any sign of extra force or heat discoloration when drilling, re-sharpen the drill. Any primary facets that are not even in length, will always make a hole larger in size than the drill size.
Jim Allen
Four faceted drill points consist of 2 separate cutting lips (primary) & 2 secondary heel clearance lips (relief). Extending the secondary heal clearance reliefs to the midpoint of the drill, produces a self centering point which eliminates center drilling or punching & is much more durable than any type of split point. Carbide faceted drills are excellent for drilling any type of hardened steels, maraging steels & difficult to drill alloys such as piano wire, dowel pins or titanium alloys, etc.. They can easily be re-sharpened, with some practice, even in small sizes (.0625"), with a Dremel diamond disc. Hold the Dremel tool in a small toolmakers vise (15,000 RPM) & hold the drill with both hands using the workbench to support your hands. Set the drill at the angles present on the drill's facets. A very small amount of pressure is required to re-sharpen the facets. I use a 5 power Opti-Visor & a good light source. Keep in mind a freshly sharpened faceted drill can easily drill hardened abrasive metals. If there is any sign of extra force or heat discoloration when drilling, re-sharpen the drill. Any primary facets that are not even in length, will always make a hole larger in size than the drill size.
Jim Allen
