Two-Flute Two-Hole Gundrills

Overview

Often referred to as the “milled style,” the two-flute two-hole gundrill differs from the double crimp by the rigidity of its body. This tool is engineered with a solid steel body, milled flutes, and coolant holes produced internally to allow for optimum coolant flow to the tip. The results yield an incredibly ridged tool. Star SU’s two-flute two-hole gundrill is used for high penetration like the Double Crimp. This tool has a milled flute design and allows maximum rigidity. It is applied where length to diameter ratios dictate a more rigid tool due to the lack of whip guides. Application dictated, this tool is applied in operations that require maximum penetration rates. Like its counterpart, the double crimp gundrill, geometries, clearances and backtaper are critical to its success. The most common materials drilled are cast irons and cast aluminum applications where materials are free of chip control issues. Two-flute two-hole gundrills are available in diameters from .250" - 1.0" with lengths to 48.”

This also has a limited flute channel and can only be applied on applications where the chips are smaller in size. Diameters are available from .2500" - 1.000". Lengths are available up to 48."

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Gundrills

• Single Flute Gundrills

  

  The single flute gundrill, with its ability to machine very straight deep holes and hold excellent finishes, was originally developed for gun barrel manufacturing. Today, this drill is designed for deep hole drilling in virtually any material.

• Solid Carbide Single Flute Gundrills

  

  Solid carbide gundrills have a two-piece construction design. The tip and body are a single piece of carbide brazed into the driver/shank and the flute is ground down the length of the head and body. This rigid design has made its way into CNC machining centers and lathes, equipped with high pressure coolant delivery systems.

• Two-Flute Two-Hole Gundrills

  

  Often referred to as the “milled style,” the two-flute two-hole gundrill differs from the double crimp by the rigidity of its body. This rigid body allows for higher feed rates than traditional crimp body style drills.

• Double Jet Gundrills

  

  Star SU, with its years of experience in gundrilling developed a Star original patented Double Jet Gundrill. The most critical interface, in which the carbide is subjected to the most traumas, is during entry/exit of the part and during interruptions of the boring cycle.

• Double Crimp Gundrills

  

  The term double crimp is derived from the process of crimping the same tube used for the single flute gundrill, only crimping it twice, 180 degrees apart. Therefore, with the flute channels on this type of tool being somewhat shallower then the single flute, they limit the type of materials to be drilled by the chip size generated.

• Bi-Tip Gundrills

  

  Similar to the Two-Flute Two-Hole “milled style” product line engineered with a solid steel body, the Bi-Tip has an auger-like helix ground in the body.