![]() ![]() Related Are impact drill bits universal For more on are impact drill bits universal read the full article. In addition to these standard coatings, many manufacturers have proprietary coatings that offer high lubricity and a high surface temperature range. Prices vary widely, and you can find drills with high-end coatings at reasonable prices. We’ve already discussed drill bit materials and coatings, so let’s go through the third essential ingredient in choosing the right drill bit: geometry. It is still a good choice for steel and stainless steel. However, due to the aluminum content, it is not a good choice for drilling aluminum. Titanium Aluminum Nitride: Titanium aluminum nitride coating has a much higher surface temperature than titanium nitride and titanium carbonitride. The gray-colored coating is excellent for high-temperature materials. Titanium Carbonitride: Titanium carbonitride coating is a step beyond titanium nitride. It provides a more rigid and better-wearing surface than titanium nitride and is usually bluish or purple. Titanium Nitride: Titanium nitride is the most common coating. It is an ideal entry-level coating for applications where less heat is transferred to the tool for cutting more rigid materials. Titanium nitride is also distinguished by its bright gold color. It has a little more oxidation and additional heat treatment that can provide up to 50% longer service life while decreasing tooling costs. Let’s cover five drill bit coatings for proper drilling because this decision can influence performance, including bright finish, black oxide, titanium nitride, titanium carbonitride, and titanium aluminum nitride.īright Finish: Bright finish coating is the cheapest option and performs well in specific applications. For example, low-carbon steel and aluminum can be drilled with a bright coating bit, usually without problems.īlack Oxide: Black oxide coating offers an advantage over the bright finish. Related What size drill bit for 5/16 tap For more on what size drill bit for 5/16 tap read the full article. They are generally used with a high-pressure coolant that flows into the tool and flushes chips out much better, keeping the cutting zone cooler while providing additional lubrication to prevent wear.Īlthough all of these drills can cut a hole in most materials, carbide drill bits will outlast cobalt by ten to twenty times on a rigid CNC machine. In other words, if a cobalt bit cuts one hundred holes, the carbide bit will cut one or two thousand holes before it has to be re-sharpened. That said, a carbide bit can easily cost ten times as much as a cobalt bit, so the investment is much more significant.ĭespite its high price, the cost per hole when using carbide is usually the lowest, as it can produce many more holes. In addition, since carbide can run three to five times faster, the decrease in cycle time to produce those holes goes directly to your bottom line. High-Speed Steel with Cobalt: A high-speed steel with cobalt material can hold up better than generic high-speed steel. The cobalt gives high speed more resistance to heat and wear. And these bits can still be quickly re-sharpened, similar to high-speed steel.Ĭarbide: Carbide drill bits are the most expensive but durable drilling material. There are different grades, with the most expensive drill bits usually offering excellent heat and chip resistance. Carbide also allows coolant to be added through the holes in the drill bit. These through-drill bits are mainly for deeper holes and difficult-to-drill materials. High-Speed Steel: A high-speed steel bit is the most basic and least expensive drilling material for general use. In addition, it is very forgiving in both press and hand drilling operations. And it can be re-sharpened to extend its durability. Let’s start with the three most common materials from which the drill bit is made. To choose the right drill bit, we first need to dive into the following three fundamental aspects that separate one bit from another, including material, coating, and geometry. ![]() How to Decide How Much to Spen on Drill Bits How to Choose the Right Drill Bit.How Often Should a Drill Bit Be Resharpened.Drilling Cutting Conditions and Application Tips. ![]()
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