Inserted Indexable Gundrill Line Does High Feed Drilling

Tungaloy Corp.’s DeepTriDrill inserted indexable gundrill line has options down to a diameter range of 14-15.9 mm. Deep hole drilling is a challenging operation and often creates a bottleneck in holemaking shops around the globe, and the brazed gundrill or solid twist drill are staple tools in such operations, the company says.

The indexable gundrill’s solid twist drill does high feed drilling, but curved holes and chip clogging are common setbacks with this type of tool. According to the company, these traditional deep hole drills are expensive and require reconditioning and inventory management.

DeepTriDrill features one insert and two guide pads oriented in an optimized position on the drill head. This achieves tight tolerances with circularity and straightness as well as an surface finish, which a brazed gundrill could traditionally attain, the company says. The insert incorporates chipsplitters on the chipbreaker geometry, which break chips into smaller pieces to facilitate chip evacuation and reduce cutting force, enabling a higher feed rate than traditional gundrills.

According to the company, the coated insert and guide pads also allows the gundrill to reach higher cutting speeds, not only increasing machining performance but also facilitating inventory management thanks to its indexable system. This small diameter range expansion also complements DeepTriDrill.