Published 11/2/2021

Tungaloy Adds Wear-Resistant Insert Grade to Gun Drill

Tungaloy’s DeepTri-Drill reportedly enables increased penetration rate over conventional brazed gun drills, boosting productivity and application security during deep hole drilling applications.

Edited by: Chris Pasion

Managing Editor, Modern Machine Shop | Production Machining

Photo Credit: Tungaloy

Tungaloy has added the wear-resistant AH9130 insert grade to its DeepTri-Drill indexable insert gun drills.

According to Tungaloy, DeepTri-Drill enables increased penetration rate over conventional brazed gun drills, boosting productivity and application security during deep hole drilling applications.

DeepTri-Drill now offers wear-resistant AH9130 insert grade for its LOGT and TOHT inserts. The grade consists of the latest physical vapor deposition (PVD) coating layer optimized for hole making applications, as well as a dedicated carbide substrate that is said to demonstrate superior wear resistance during deep drilling of steel, stainless steel and cast iron.

LOGT inserts have two cutting edges; they cover drill diameters ranging from 12.0 mm to 13.9 mm (.472″ to .547″). TOHT inserts have three cutting edges that come in six sizes and cover the tool diameter range from 14.0 mm to 28.0 mm (.551″ to 1.102″). Both insert styles have chip splitters on the cutting edge that break chips in small pieces for smooth and secure evacuation, reportedly eliminating drill breakage during deep hole machining.

The DeepTri-Drill inserts are said to demonstrate effective chip control during deep hole drilling in a broad range of materials due to the pressed-to-form 3D chipbreakers on their rake face. Chip splitters on the cutting edge securely break the chips into small pieces, which are smoothly evacuated with the help of the chipbreaker from the cutting point and out of the hole.

DeepTri-Drill eliminates the need for reconditioning worn drills and also provides reduced downtime through its ability to change inserts while remaining in the machine spindle. In addition, the tool requires a minimal storage space, compared with traditional gun drills with brazed cutting edge, and streamlined inventory management.

The guide pads are placed on the drill body so that the drill can provide a maximum tool life and close hole tolerances, and worn guide pads are replaceable.