DeepTri-Drill Indexable Deep-Hole Drills

Contact Details

Tungaloy America Inc.
3726 N. Ventura Dr.
Arlington Heights
United States
Toll Free Phone

42.144245, -88.002711

January 05, 2020
DeepTri-Drill Indexable Deep-Hole Drills

Tungaloy’s DeepTri-Drill line of indexable deep-hole drills now includes FH3135-grade guide pads.

DeepTri-Drill is a successful line of indexable insert gun drills that provides productivity and application security for drilling deep holes, while ensuring easy tool management by eliminating the need for regrinding. The drill line now offers a new FH3135-grade guide pad that was developed specifically to enhance thermal crack resistance when machining with water emulsifiable oils.

The tribological conditions during gun drilling between the guide pad surfaces and the wall of the hole being drilled are far more severe than those during other applications. To ease this harsh condition and maximize guide pad life, it is crucial to use cutting fluids with high lubricity in order to prevent dry rubbing and seizure at the burnishing contact areas. For these reasons, straight cutting oils have long been preferred among manufacturers in gundrilling operations for its high lubricity. However, in today’s environmental conscious machining, the call for eco-friendly water emulsifiable oils, more commonly known as soluble oils, are increasing over conventional petroleum-based coolants. These soluble oils have lower lubricity than straight oils and can adversely affect the guide pad quality during gundrilling.

To meet this challenge, Tungaloy has expanded its DeepTri-Drill guide pad options to include the FH3135 grade. Guide pad rupture is primarily induced by an increase in density of thermally-induced microcracks generated on the substrate due to poor lubricity and thermal capacity when machined with soluble oils. The dedicated carbide substrate of the FH3135 guide pad provides enhanced resistance to fracture and thermal crack, significantly reducing the risk of guide pad breakages. In addition, the new guide pad features a double-chamfer geometry on the corners of both ends assisting a smooth entry into the guide bushing or pilot hole, inherent when machining on dedicated gundrilling machines. This reduces vibrant impact on the guide pads and the risk of rupture.

At a glance:

Guide pads with high fracture resistance for use with soluble oils

Dedicated carbide substrate has superior resistance to fracture and thermal cracks

Double-chamfer geometry allows smooth entry into a guide bushing or pilot hole

Total of 13 items to be added

Related Glossary Terms

  • burnishing


    Finishing method by means of compressing or cold-working the workpiece surface with carbide rollers called burnishing rolls or burnishers.

  • bushing


    Cylindrical sleeve, typically made from high-grade tool steel, inserted into a jig fixture to guide cutting tools. There are three main types: renewable, used in liners that in turn are installed in the jig; press-fit, installed directly in the jig for short production runs; and liner (or master), installed permanently in a jig to receive renewable bushing.

  • gundrilling


    Drilling process using a self-guiding tool to produce deep, precise holes. High-pressure coolant is fed to the cutting area, usually through the gundrill’s shank.

  • indexable insert

    indexable insert

    Replaceable tool that clamps into a tool body, drill, mill or other cutter body designed to accommodate inserts. Most inserts are made of cemented carbide. Often they are coated with a hard material. Other insert materials are ceramic, cermet, polycrystalline cubic boron nitride and polycrystalline diamond. The insert is used until dull, then indexed, or turned, to expose a fresh cutting edge. When the entire insert is dull, it is usually discarded. Some inserts can be resharpened.

  • lubricity


    Measure of the relative efficiency with which a cutting fluid or lubricant reduces friction between surfaces.

Additional Products from Tungaloy America Inc.

TCB now offers AH6225 grade inserts. This latest physical vapor deposition (PVD) coated grade features a high-hardness titanium-rich PVD coating, combined with a tough dedicated carbide substrate. Extremely reliable and versatile insert grade, AH6225 allows TCB to efficiently cut bores in all Read More
DrillForceMeister incorporates a unique head-shank coupling interface that provides exceptional reliability when drilling relatively large diameter holes from 20 millimeters to 41 millimeters. When clamped, the drill head interlocks with the shank at larger contact areas, promoting high hole Read More
Providing exceptional reliability and increased tool life in steel, the new AH3225 insert grade consists of a unique nano-multilayer coating featuring three distinctive characteristics for improved resistance to built-up edge, wear, and delamination, combined with a dedicated tough carbide Read More
The CBN-tipped mini boring bars feature BX310 uncoated CBN grade that increases the grade’s wear resistance when used at low to medium cutting speeds, making it perfect for machining small bores from as small as 2.8 millimeter (.110 inch) diameter of hardened steel parts.
The QC16 line offers toolholders with 16x16 mm square shanks and the matching modular cutting heads. The new line features an enhanced coupling that is capable of sustaining high cutting edge repeatability and tool rigidity when used for applications generating greater cutting loads that Read More
DoMultiRec multifunctional milling cutter with center cutting capability enables a single tool to perform multiple milling operations, including shouldering, pocketing, and drilling. The DoMultiRec inserts to ensure strong and sharp cutting edges during various milling and drilling operations.
A PVD-coated cemented carbide grade, AH8015 features an extremely hard high-aluminum content multilayer coating that is combined with a tough dedicated carbide substrate. The grade provides the insert with a well-balanced wear and chipping resistance.
AddInternalCut inserts are available in two sizes: TCIG10 insert is for internal grooving of minimum bore diameter of 10.5 millimeters (.413 inches) and up. TCIG12 allows a maximum groove depth (CDX) of 3.0 millimeters (.118 inches).
Together with successful AH7025 grade for first choice, AH6235 and AH8005 grades will enhance TungCut performances in parting and grooving operations with interruptions, as well as grooving and turning operations with aggressive conditions.
SolidMeister barrel endmills are efficient tools for complex 3D surfacing operations used in mold making, orthopedic implant work, and the machining of gas turbine blades and other freeform surfaces in the aerospace and energy industries. The endmills incorporate a cutting edge that is actually the Read More