Single Flute Deep Hole Drilling

Single Flute Deep Hole Drilling

Gundrilling was developed to produce straighter more accurate gun barrels.single flute deep hole drilling They are used to drill holes in a variety of materials including cast iron, carbon and alloy steels, tool steel, high-temperature alloys, titanium, copper, brass, aluminum, wood and plastic. Unlike traditional drills that have spiral flutes, single-flute gun drills have a solid carbide tip with straight shaft and guide pads that allow for rapid coolant flow down the length of the flute to lubricate the cutting edge, reduce heat generation and eliminate chip buildup during drilling. This allows the use of smaller diameter tools to achieve higher speeds than conventional drills and enables the drilling of deeper holes.

Typical conventional drills are limited in their depth-to-diameter ratio and have to retract and clean frequently during drilling which can lead to poor hole quality, reduced accuracy and shorter tool life.single flute deep hole drilling Single Flute Gun Drills, on the other hand, can be used for holes up to 80xD in a range of materials and can operate at significantly higher feed rates than conventional drills. They also require no whip support for depths up to 8xD and are self-piloting once inserted in the hole requiring only a starting bushing or pre-drilled starter hole.

Carbide tipped single-flute gun drills are manufactured as a three piece unit with the carbide tip, an aircraft grade seamless tube and a steel driver, typically silver brazed together into a precision unit.single flute deep hole drilling They are available in stock catalog sizes for same day delivery and can be made to order with a wide variety of special end forms. Special coatings are available to maximize performance for specific applications.

In addition to the benefits of increased productivity, a key advantage of gun drilling is its reliability. This is important for manufacturers that must meet strict production schedules and stringent quality control standards. The consistency of gun drilling provides holes that are precise, accurate and repeatable which can minimize disruptions to production.

One of the reasons for the reliability of gun drilling is its high-efficiency. The continuous delivery of coolant to the cutting edge lubricates the cutting surface and cools the hole, reducing friction and temperature that would otherwise lead to tool wear and breakage. It also flushes chips away from the cutting edge, reducing clogging and increasing throughput.

The most critical element of any drill is the point, or nose grind. This angle is adjusted based on the material being cut to balance cutting forces and direct them to the tip’s bearing pads to keep the tip concentric. Using a small peck at the start of the drilling cycle helps to break chips while minimizing the frequency and depth of each peck as the hole becomes deeper. This strategy also helps to eliminate the need for full retraction which can result in chip re-entry and a loss of efficiency. Increasing the frequency of the peck can also help to improve hole finish. This approach is especially beneficial in hard materials. The right combination of geometry, materials and coolant can dramatically increase the number of holes that are produced per minute and reduce downtime and scrap resulting from retraction and tool breaks.

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