As we said earlier, every manufacturer has its own special sauce when it comes to drill bit design but the high-level points we covered here are universal. We hope that this condensed guide will serve as a foundation and help you understand what to consider when choosing the right drill bits for your upcoming jobs.

The CNC lathe machine. Turning machine for drilling with the drill tool and center drill tool. The hi-technology machining. CNC milling machine.

The CNC lathe machine thread cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

The CNC lathe machine in metal working process bore cutting the metal shaft parts with the cutting tools. The high precision parts production processing by CNC turning machine .

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The CNC lathe machine forming cut the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

The CNC lathe machine cutting the slot at the metal parts. The automotive parts manufacturing process by turning machine .

The CNC lathe machine groove cutting the metal pulley parts with lighting effect. The hi-technology metal working processing by CNC turning machine .

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Throw a good coating on any drill bit and you’ll completely change its characteristics. Coatings extend tool life and improve cutting performance. We’ve selected a few of the most popular coatings to keep things simple, so let’s jump in.

The operation of lathe machine cutting the brass shaft parts with the cutting tools. The metalworking process by turning machine.

This is an excellent and underappreciated feature in twist drills. A split-point drill bit prevents walking when starting a cut. Without a split-point, technicians would first need to drill pilot holes or use punches in order to start their cuts. This would, of course, take a lot more time and cut into your bottom line.

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The CNC lathe machine thread cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

CNC lathe machine (Turning machine) clamping the sample metal part in the light blue scene.Hi-technology CNC machining concept.

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The CNC lathe machine cutting the thread at the metal shaft. The hi-technology automotive parts manufacturing process by turning machine.

The first thing to think about is the composition of the drilling bit. There are three popular composites and they all serve a different purpose.

M42 Cobalt is high-speed steel with 8-10% Cobalt added in order to increase the hardness and endurance of the tool. You can pretty much expect the same characteristics as a standard HSS drill, but with increased performance across the board.

Cnc machine. The CNC lathe machine or Turning machine. Turning numerical control machine with tools and chuck fot automotive.

The multi-tasking CNC lathe machine milling cutting the metal shaft parts by milling turret. The high technology metal working with CNC turning machine.

The operation of lathe machine cutting the metal parts with the cutting tools. The metalworking process by turning machine.

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A critical feature in twist drills, helix angles determine the process of chip formation. Large helix angles are good at removing soft, long-chipping materials. Small helix angles are good for the removal of hard, short-chipping materials. Note that there is some overlap in how helix angles are categorized.

The multi-tasking CNC lathe machine swiss type milling cut the metal parts by milling spindle. The high technology metal working with CNC turning machine.

The multi-tasking CNC lathe machine groove cutting the brass shaft parts by milling spindle. The high technology metal working with CNC turning machine.

The CNC lathe machine hole cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

The CNC lathe machine thread cutting at the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

Carbide drills allow for a Through Spindle Coolant system or TSC as it’s known. In situations where you’re drilling deep into very hard materials, the feeding of coolant through the drill allows for better chip evacuation and self-cooling. This also helps to prevent wear, which is nice since TSC drill bits are pricey.

The CNC lathe machine forming cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

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Skinny drill bits snap more easily than thick drill bits. This is where spending a little more money for heavy-duty geometry is nice. That said, there is much more to drill design than the thickness and it’s not always a priority but it is a nice thing to be aware of.

The CNC lathe machine in metal working process cutting the metal ring parts with in the light blue scene. The hi-technology metal working processing by CNC turning machine .

The operation of lathe machine cutting the brass shaft parts with the cutting tools. The metalworking process by turning machine.

The CNC lathe machine in metal working process cutting the metal shaft parts with in the light blue scene. The hi-technology metal working processing by CNC turning machine .

CNC lathe machine (Turning machine) cutting the metal screw thread part with the cooling tube .the cnc cooling component with the sample part.

The CNC lathe machine groove cutting the metal pulley parts. The hi-technology automotive parts manufacturing process by CNC turning machine .

The CNC milling machine cutting the raw material with the index-able tool in light blue scene.The rough cutter for CNC machine with lighting effect

Solid Carbide drill bits are the most expensive but they will outlast other drill bit materials by a longshot.  A Carbide drill will outlast a Cobalt drill by at least twenty times, reducing the cost-per-hole significantly.

There are actually a handful of drill point angles, but 118º and 135º are the two most common. A 118º drilling point is commonly put on lower-cost, general-purpose drill bits. It’s suitable for mild steel, aluminum, and other soft metals. On the other hand, 135º is for hardened steel and other tougher materials.

The CNC lathe machine thread cutting at the metal shaft parts with lighting effect. The metal working on the CNC turning machine .

If you have any questions at all, please feel free to reach out to our team at (833) 4-ETOOLS. You can also email us at sales@eldoradotools.com.

The CNC lathe machine thread cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

The CNC lathe machine in metal working process cutting the metal shaft parts with the cutting tools. The automotive parts production processing by CNC turning machine .

The CNC lathe machine forming cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

AlTiN is a couple of steps up from TiN, with extended life and performance. An interesting charismatic is that these do not perform well on aluminum since aluminum is part of the coating.

Close up scene the lathe machine finish cut the metal shaft parts by insert tools. The metalworking process by turning machine.

The CNC lathe machine cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

A shorter drill bit is more rigid which is ideal so you should always use the shortest drill possible. That said, sometimes you have to use a longer drill bit. In these instances, you should at least use the shortest flute-length (cutting portion) possible. Using a drill with an unnecessary long flute length means that you’re choosing to use a less stable drill. This is not advised. The next question to ask is, “How much flute length do I need?” The rule of thumb for determining this is to take the diameter of the drill bit, double that, and then you’ll have the minimal flute length needed above the hole for proper chip evacuation.

The operation of lathe machine cutting the metal shaft parts with the cutting tools. The metalworking process by turning machine.

The multi function CNC lathe machine cutting the steel shaft in light blue scene.Hi-technology CNC manufacturing concept.

The cutting tool of CNC lathe machine or turning machine cutting the aluminum rod . Hi-technology manufacturing process.

The CNC lathe machine thread cutting at the end of metal stud parts. The hi-technology metal working processing by CNC turning machine .

The CNC lathe machine thread cutting at the end of metal stud parts. The hi-technology metal working processing by CNC turning machine .

The multi-tasking CNC machine slot cutting at the brass shaft parts with the slot tool. The hi precision parts manufacturing process by CNC lathe machine with the cutting tools.

Black Oxide finishes increase lubricity which helps to resist damage from heat and corrosion. Naturally, this also extends the life of the tool. These bits are best for use on ferrous metals.

The operation of lathe machine cutting the brass shaft parts with the cutting tools. The metalworking process by turning machine.

The CNC lathe machine groove cutting the pulley parts. The hi-technology metal working processing by CNC turning machine .

One characteristic of Carbide is that it’s brittle, so it won’t flex. This makes Carbide a bad choice for hand drilling. If you’re running a CNC or frequently use a drilling press, this material is worth the investment.

The operation of multi-tasking CNC lathe machine swiss type tapping on the pipe connector parts. The hi-technology pipe connector parts by CNC turning machine.

The CNC lathe machine cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

The CNC lathe machine forming cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

When it comes to choosing the right drill bit for the job, there are three things to consider; material, coating, and the geometry of the tool. We’ll break it all down in a concise way to help clear things up to save you some time.

Closeup scene the lathe machine finishing cut the brass shaft parts by lathe tools. The metalworking process by turning machine.

CNC lathe machine (Turning machine) cutting the metal screw thread part by lathe cutter .Hi technology CNC machining concept.

The operation of multi-tasking CNC lathe machine swiss type cutting the hi-precision part. The hi-technology pipe connector parts by CNC turning machine.

The CNC lathe machine forming cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

Black and Gold finish drill bits resist corrosion and breakage while increasing lubricity. These bits are not prone to chipping and flaking.

The CNC lathe machine or turning machine cutting the thread at end of the steel pipe in the light blue scene. Hi-technology manufacturing process.

The CNC lathe machine groove cutting at the metal pulley part. The hi-technology metal working processing by CNC turning machine .

High-Speed Steel (HSS) is the most popular drill bit material for several reasons. High-Speed Steel is readily available, and we have plenty of it right here in the United States. HSS is also extremely versatile. Manufacturers can configure an HSS drill bit for just about any application you can think of.

The CNC lathe machine forming cutting the metal shaft parts. The hi-technology metal working processing by CNC turning machine .

The CNC lathe machine operation by cutting the sample bullets parts in the light blue scene. The hi-technology metal working processing by CNC turning machine .

The operation of CNC lathe machine cutting the metal shaft parts in the light blue scene. The hi-technology mechanical parts manufacturing process by CNC turning machine.

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Geometry is just as important as the material and coating when it comes to the performance and characteristics of a drill bit. Consider that every manufacturer has its own proprietary configurations so we’ll just focus on the general aspects.

Threading of metal parts on the lather machine at the factory, industrial concept, lots of metal shavings, front view, close-up

The multi-tasking CNC lathe machine chamfer cutting the metal shaft parts by milling turret. The high technology metal working with CNC turning machine.