All of the different types of drill bits in these categories are based on High-Speed Steel (HSS), a designation you’ll often see when reading about bits. However, the treatments those HSS bits receive to make them black oxide, titanium, or cobalt make marked changes in the performance, intended use, and longevity. Learning the differences helps you avoid wasting money and using the wrong bits for the wrong materials.

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Reducing rotation speed often resolves chatter, though this approach can impact machining efficiency and surface quality. Balancing these trade-offs and optimizing rotation speed effectively minimizes vibration.

The consistent use of new heads prevents performance decline and quality fluctuations often induced by re-grinding and re-coating. This approach guarantees stable, prolonged tool life and consistently high-quality machining results.

Opt for blades featuring substantial rake and helix angles alongside sharp cutting edges. This mitigates the radial cutting force, a primary contributor to chatter during chamfering.

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Titanium bits are great for general-purpose drilling in a production environment because they drill quickly. The TiN coating also helps chips flow thru the flutes which is helpful because some materials – like aluminum – adhere to bits more than others. However, once the tip is dulled, it won’t regain its cutting edge without being recoated in titanium nitride. It usually makes more sense to replace rather than recoat them. So even though they are harder than cobalt,  their edge is only skin-deep.

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Sometimes, reducing the number of inserts on the tool, such as transitioning from 4 to 2 inserts (or even down to 1 insert in specific cases) for indexable cutters, can help in damping chatter.

Specifically, this involves removing sharp edges and burrs from the workpiece to form a flat, chamfered slope. This slope is generally machined at a 45 degree angle, but the angle may vary depending on the use and purpose.

Machining materials with burrs or sharp edges can swiftly damage tools. Chamfering in advance minimizes tool wear, prolonging tool life and ensuring more efficient machining processes.

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During chamfering, encountering chatter represents a notable issue. This phenomenon, known as chattering, becomes particularly problematic when chamfering around holes using a punching technique. A common occurrence is observed when executing a C chamfer with a 45-degree angle, resulting in a tool edge aligned at the same angle. This alignment escalates the cutting force, directing deflection towards the tool diameter.

Because of their durability and cost, most Pros don’t use cobalt drill bits for general purpose use. The extra hardness lets manufacturers make the flutes smaller as a percentage of the total thickness, increasing the strength of the bits. You can also sharpen them without losing cutting effectiveness.  Cobalt bits cost more than TiN or Black Oxide bits, but many Pros find value in the toughness.

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Tungaloy´s main chamfering cutters, such as ECC and TungQuad, have a cutting edge design with a large rake angle that is optimized for chamfering.

Titanium drill bits are HSS bits that have been coated with titanium nitride (TiN) using a process similar to electroplating.  TiN is a ceramic material that increases the surface hardness of the bit and provides a thermal barrier by reducing friction. This results in increased production rates, corrosion resistance, and a 3 to 6 times longer tool life.  Titanium bits are suitable for drilling iron, steel, aluminum, magnesium, and wood.

Thread chamfering is a meticulous process that delicately trims corners to an imperceptible degree. It serves a unique purpose, ideal in cases where neither C-Chamfering nor R-Chamfering is required. Instead, the focus remains on eliminating burrs to an extent that escapes visual detection.

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The chamfer width exhibits irregularity, attributed to tool deflection and chatter, varying based on the machined area and the hole’s phase. As a solution, the measures shown in the previous section”Chatter in Chamfering Processes” are also effective in this case.

Decreasing chamfer width proves effective in curbing tool deflection and subsequently suppressing chatter. For instance, when handling larger chamfers (C5 or higher), pre-machining the workpiece into a multi-stage hole shape using a drill or counterbore cutter helps reduce machining allowances and dampens vibrations during chamfering.

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High-speed steel is alloyed with  5-8% cobalt to create cobalt drill bits. These are the best drill bits for metal due to their high resistance to the massive heat generated when drilling through highly abrasive and/or hard materials such as treated stainless steel, titanium, and cast iron. Unlike the TiN coating, cobalt is found throughout the entire material which makes it great for high production work.

C-Chamfering represents a prevalent technique where edges are sliced at a precise 45° angle. Often, discussions surrounding “chamfering” primarily allude to this method. Practical directives such as “C1” are commonly employed in on-site procedures, indicating the removal of a 1mm width from the edge.

Chatter during chamfering arises from radial cutting resistance and tool deflection due to this resistance. Additionally, resonance vibrations leading to chatter may occur when the tool’s rotational speed aligns with its natural frequency. Employing tools with high rigidity minimizes deflection, elevates the tool’s natural frequency, and prevents synchronization between tool speed and natural frequency.

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For example, if you look at the four corners of a smartphone, you will notice that the corners are diagonal, rounded, and chamfered to prevent pain.

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Chamfering is often used in cooking because cutting off the corners of vegetables prevents them from collapsing during cooking and allows the flavors to soak in more easily.

Explore Tungaloy’s TungMeister line, featuring a diverse selection of exchangeable head tools designed for precise chamfering applications. These tools simplify tool replacement through their interchangeable heads. The TungMeister lineup includes three specialized head types—center drill, back chamfering, and R chamfering heads—ideal for both chamfering and spot drilling tasks, offering versatility to address specific machining needs.

Rather than confusing cobalt with titanium or black oxide, you may simply mistake it for a standard HSS (high-speed steel) twist bit.

By averting stress concentration—focusing stress in specific areas—chamfering improves the fatigue strength of components. Stress concentration refers to the accumulation of stress in particular zones, while fatigue strength measures a material’s resilience against repeated stress cycles.

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Tungaloy highly recommends DrillMeister, an exchangeable head tool featuring a chamfer body that significantly enhances chamfering efficiency.

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Manufacturers heat HSS bits to 950 degrees Fahrenheit, creating a black oxide finish that resists rust and corrosion. This reduces friction between the bit and the workpiece, thereby speeding up the drilling process. Bits made with a black oxide coating are suitable for work on steel, copper, aluminum, brass, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon, and composite materials.

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Utilize an indexable chamfering tool equipped with a chip breaker to curb chip extension and entanglement with the tool.

R-Chamfering involves a process dedicated to curving corners, notably effective in mitigating the risk of injuries. This method excels in ensuring smoother, safer edges.

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For the most part, you can tell the various types of drill bits by how they look. Titanium makes for the most obvious drill bit type. The brassy color gives it away. Aside from that, the flat black of black oxide bits helps you identify them quickly as well. When it comes to cobalt drill bits, this type can vary in appearance. For the most part, you want to look for a deeper color that almost has a blueish-silver hue (similar to a gunmetal color).

Chamfering serves more than just an aesthetic purpose; it yields numerous advantages, enhancing both product quality and functionality.

Employ a strategic approach of “step” or “dwell machining” during the machining process to forcibly break up chips. “Dwell machining” involves a temporary pause in feed progress while the drill spindle continues to rotate, aiding in chip fragmentation.

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With remarkable advancements in tool technology, it’s easy to feel like you’re falling behind the latest improvement. If you’ve ever stood in front of rows of hammers, deciding among a hickory, fiberglass, or carbon fiber handle—you get the picture. The incredible market mechanism that meets our needs also creates questions. What about the many types of drill bits? We can talk about the best drill bits, but let’s talk about the differences between black oxide, titanium, and cobalt drill bits.

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In scenarios involving larger chamfer widths (such as C2 or higher), the radial cutting force intensifies, significantly amplifying chatter due to tool deflection.

Explore the “Drawing System for Special Drilling Tools”! By inputting essential tool details, you can swiftly generate straightforward diagrams illustrating special drilling tools with chamfering functions.

We hope we’ve been able to help you understand the differences in black oxide, titanium, and cobalt drill bits. Have some Pro tips of your own on how you choose drill bits? Add them in the comments below or sound off on Facebook, Twitter, and Instagram.

Black oxide bits last up to 50% longer than standard HSS bits. They offer superior durability and speed.  Many pros find they get years of use from them and consider black oxide bits the best general-purpose drill bits you can buy.

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Effective chip management is crucial to prevent the entanglement of chips that might otherwise lead to tool damage or workpiece impairment. Similarly to the occurrence of “Chatter in Chamfering Processes,” this issue often arises during continuous machining, especially when chamfering around holes.

The tool’s overhang length and the drill’s distance from the chamfering edge remain constant with an exchangeable head drill. This maintains dimensional accuracy during machining, significantly reducing the risk of defective workpieces.

DrillMeister’s specialized exchangeable head drills revolutionize machining by merging innovative design with practicality, resulting in heightened machining accuracy, efficiency, and cost-effectiveness.

Chamfered parts contribute to a uniform finish when painted or plated, resulting in a high-quality appearance that enhances the overall aesthetic appeal.

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DrillMeister’s special chamfer employs inserts with chip breakers that effectively manage chips during chamfering, preventing elongation and entanglement, thus improving chip control.