Whether it’s using drills to make holes, borings bars or reamers to enlarge their IDs, or taps to thread them, this is where to read up about holemaking. Holemaking is a process used to cut a hole in a part or a workpiece.

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Holemaking: Essential Reading

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FAQ: Holemaking


What Are Carbide Coatings?


Most modern carbide inserts and solid carbide tools are coated with a thin film (between 3 and 20 microns, or 0.0001 to 0.0007 inch). The coating is typically composed of titanium nitride, aluminum oxide and titanium carbon nitride layers. This coating increases the hardness and creates a heat barrier between the cut and the substrate.

Source: Choosing Your Carbide Grade: A Guide


What is a counterbore?


Counterboring is a machining operation that will enlarge an existing hole’s diameter to a specified depth. Traditionally, counterboring is done with either a special counterboring tool that has a pilot, or it is done with an end mill. In either case, the diameter of the tool (end mill or counterbore) must match the diameter that is counterbored.

Traditional counterboring is great for smaller holes, but as holes get larger, the cutting tools get more expensive.

Source: Custom Macro To Helically Mill A Counterbore



What is countersinking?

A countersink is a functional surface upon which a fastener head bears. Because fastener performance is so important, countersink tolerances are critical.

Source: Gaging Countersunk And Chamfered Holes

What is a chamfer?

Hole chamfers are usually specified simply to make it easier to insert a screw, pin, bushing, or other assembly component. The component doesn't bear on the chamfer, so diameter and angle tolerances are usually not critical to the part's performance.

Source: Gaging Countersunk And Chamfered Holes



Holemaking Suppliers

Kennametal Drill Lineup Offers Extended Application Range

The Drill Fix Pro is designed for extended tool life and smooth drilling at high metal removal rates, with outboard inserts that feature a wiper geometry for smoother surface finishes and larger coolant channels for high-volume flow.

Monaghan Reaming System Provides Long Service Life

The Diatool Top Speed Ring modular reaming system features multiblade design with uneven spacing of cutting edges to create round and cylindrical bores.

Tungaloy Drills, Milling Inserts Provide Enhanced Stability

Tungaloy has expanded its DrillForceMeister and TecMill lines with new drill bodies and milling inserts.

Walter Drilling Inserts Provide Extended Tool Life

The P6006 indexable inserts are said to be ideal for holemaking without a pilot drill up to 10×Dc.

Kennametal's Expanded Tooling Portfolio Improves Performance

The company has launch eight new products that expand on and support existing platforms across multiple applications.

Tungaloy Counterboring Tools Feature New Cutting Inserts

The new AH6225 grade features a high-hardness, titanium-rich PVD coating, combined with a tough dedicated carbide substrate.