Gundrilling is a great solution for most deep hole and high precision drilling projects. In addition, this operation produces accurate, repeatable holes with excellent surface finishes. Also, gundrills hold location to precise tolerances, are sized to exact specifications, produce burr-free holes and can be formed to produce specific shapes in blind holes and bottom forming with a minimum of machine adaptation.
High-pressure coolant is delivered through a duct inside the drill and forced through the center of the gun drill or ejector drill. Also, the coolant provides lubrication and aids in chip removal. Chips exhaust through a V-shaped chip flute along the outside of the drill. Due to the v-groove, the cross-section of the tube occupies .75 of its circumference.
Gundrills Or Ejector Drills
Deep hole drilling was first developed for the manufacturing of guns, hence the name gundrilling. Originally an expensive and time-consuming process, technological advances have made it a highly efficient manufacturing process utilized in all metal cutting industries, including automotive, aircraft, aerospace, construction, medical, tool and die, petrochemical, hydraulics, pneumatics and more.
Gundrills or ejector drills can be used on a variety of machining and turning centers equipped with sufficient high-pressure coolant and filtration systems. Also, these tools and this system allow depth to diameter ratios in excess of 100x’s dia. BTA Heller offers several different carbide grades, coating, and grind options.
BTA Heller sells gun drills in diameter ranges from 1.40 mm to 50.80 mm (0.055″ to 2.0″). Also, BTA Heller offers a wide variety of gundrill types such as:
- Solid carbide tip & shank, single kidney oil hole, single flute
- Single round oil hole, single flute
- Two round oil holes, single flute
- Kidney shaped oil hole, single flute
- Two oil holes, two flute
- Single oil hole, single flute, chips ahead reamer
- Two oil holes, two flute, chips ahead reamer