For most applications this dimension is 25% of the diameter, or Ø/4.
The point location balances the cutting forces. Consult engineering regarding length of step and diameter ratio. They are available in a wide array of diameters and step lengths, with a variety of transition forms between diameters and are capable of cutting a variety of materials. Star Multi Step Gundrills are used to produce holes concentric to one another. This tool has a single flute 3-piece construction design and has the deepest flute channel, thus enabling maximum chip evacuation. Star Single Flute Gundrill s are a general-purpose tool used in most deep hole drilling applications to obtain hole sizes within. With five decades of design and cutting too experience, Star SU’s gundrill engineering group designs the tool to custom fit each application. These angles and clearances can be modified to change the cutting performance results, and also assist in modifying the high-pressure coolant for better chip flushing or reducing the heat generated at the cutting edges.Įvery material has its own machinability characteristics. The proper selection and reproduction of geometry is crucial to its total overall performance. Point angles and clearances play an instrumental part in the equation. These features are strategically engineered per application along the outer diameter for the length of the carbide head. Star SU has a wide range of contours/wear pads that gives the tool the burnishing effect needed to obtain the finish and hole size while controlling heat/friction for a given material. The success of this process is a combination of special tool design having a positive rake face, edge preps and finishes in conjunction with establishing speeds and feeds for proper chip control.Īdvance cutting tool coatings are also applied based on each specific customer application. This technology’s has been proven in material such as 416 SS, 4150v, 4140 and other materials. Star SU also offers a High Performance Gundrill, which is capable of running up to 3-4 times faster than the standard gundrill. The additional advantages of a single flute gundrill: Once into the cut, the tool is self-piloting. The design of the single-lip, straight deep “V” flutes and high coolant pressure allows for fast, consistent penetration without the need for pecking.ĭue to the point not being on center, the tool requires either a bushing or a pilot hole starting support. The gundrill can achieve precision holes in one pass thus eliminating the need for secondary passes, and is a tool for consistent hole-to-hole reproduction. The gundrill is designed to drill holes from solid material, and can produce bottom hole configurations, and minimize burr at intersections.
Lengths over 72” will have an additional weld joint in the body of the tool. All gundrills can be made to any specific length. Larger diameter tools are available using a brazed inserted blade design. 093” through 1.500” as a solid carbide head. Star SU’s Single flute gundrill product line diameter range is. The gundrill requires high-pressure coolant through the tool, keeping the cutting edges lubricated and providing adequate chip evacuation down the flute channel. Today, this drill is designed for deep hole drilling in virtually any material. The single flute gundrill, with its ability to machine very straight deep holes and hold excellent finishes, was originally developed for gun barrel manufacturing.
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