Tungaloy Extends Gundrilling Series

The Tungaloy gun drilling range has been well received in the industry and this has now led the Japanese cutting tool manufacturer to extend the line further. The expansion of its popular indexable gundrill series, the DeepTriDrill will now include a diameter range from either ø28.01 to ø40mm or ø1.1” – ø1.57”.

Deep hole drilling is recognised as a challenging operation that often induces bottlenecks in many manufacturing shops. Brazed gundrills and solid twist drills are traditional tools for this operation but the typical brazed gundrills usually accommodate a single-flute, non-coated carbide tip, which constrain its applications to low parameter drilling. The solid twist drill is better for high feed drilling; however, curved holes and chip clogging are common setbacks. Re-conditioning and inventory management also incur significant extra costs with manufacturers.

The new DeepTriDrill range incorporates 3 inserts and 2 guide-pads oriented in an optimised position on the drill head. This helps achieve high accuracy regarding hole circularity, straightness and surface finish, which was traditionally reserved for brazed gundrills. The insert features chipbreakers designed to create optimal chip flow during deep hole drilling. Improved chip evacuation and reduced cutting forces enable higher feed rates than traditional gundrills.

The coated inserts and guide-pads also allow DeepTriDrill to reach higher cutting speeds, which is difficult with brazed gundrills. The new DeepTriDrill not only increases drilling performance while maintaining machining stability, but also facilitates inventory management thanks to its indexable system. This large diameter range expansion complements DeepTriDrill, further enhancing its product positioning in the deep hole drilling market for high productivity and economy.

At a glance, the new developments are based on BTA drilling technology to deliver optimised insert and guide-pad orientations with high accuracy with hole circularity, straightness and surface finish. This allows for 1.5 to 3 times higher feed rates than that of brazed gundrills.