Solid Carbide Single Flute Gundrills

Overview

Solid carbide gundrills have a two-piece construction design. The absence of the braze joint at the head/body transition eliminates the possibility of coolant obstructions while adding significant strength to the tool. The design of this product helps improve the T.I.R. between the head and body.

Solid carbide gundrills are available from diameter ranges of .039" [1.00mm] to .200 [5.08mm] and greater with lengths up to 11.25” [286mm]. The greatest benefit of this type of tool is its rigidity. When a tool enters the material, as well as while it’s drilling, it’s exposed to torque forces, or wind-up. This has a detrimental effect on the carbide, resulting in premature wear.

The solid carbide gundrill strength counters the wind-up forces. Another advantage of two-piece solid carbide gundrill versus the traditional three-piece construction gundrill is the ability to run at much higher feed rates. Many applications yield to high surface footage with conventional style gundrills.

The strength of the solid carbide gundrill can allow penetration up to 2x-3x higher feed rates running at conventional RPM’s. See below for a table of standard solid carbide gundrill size ranges.

With extensive knowledge and practical experience in machining all types of steels (including exotic alloys), irons, and aluminums, Star can provide the best possible answer to your production needs.

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Specs

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.