CNC cutting tools are a must-have when machining. Each tool can perform specific operations that shape, cut, or finish a workpiece to precise specifications. As you get more involved with CNC machining, you’ll notice that various tools go into these machines.
Whether it involves CNC drilling tools that bore precise holes or milling tools that remove excess material, the correct tool can mean the difference between a flawless finish and a piece that cannot get past quality control. You can increase the efficiency of your project simply by using the right cutting tool tailored to the material and the complexity of the design.
It doesn’t matter if you’re new to CNC machining or are a machine operator with years of experience – having a good grasp on different cutting tools is the first step towards ensuring high-quality, consistent production for various applications. Keep reading to learn more!
Types Of CNC Cutting Tools
Different CNC machine tools can help produce different parts. Some companies, like JetCrafted, must always have suitable tools for CNC operations. Whether dealing with creating internal threads, shaping materials with high-speed steel, or operating CNC milling machines, the choice of cutting tools can greatly impact the entire project.
If you’re new to the topic, you should know that there are many types of cutting tools used in CNC machine operations. Each performs a specific task that helps create a final product.
Here are only some of the CNC cutting tools you should know:
Reamers
Reamers are precision tools that enlarge previously formed holes to achieve a precise diameter and smooth finish. They come in various shapes and sizes, designed for tasks ranging from basic hole refinement to creating complex internal threads. You must select the appropriate reamer for a task to avoid damage to the workpiece and ensure accuracy.
Face Mill
A face mill is a robust multi-edged cutting tool used primarily on CNC milling machines to produce flat surfaces. Their main advantage is their efficiency in quickly removing large amounts of material, making them preferable over other tools for specific applications. These cutters can handle high-temperature conditions and are available in different configurations for various machining needs.
Thread Tap
Thread taps are specialized tools used to cut internal threads within holes. They come in various forms, including straight, spiral point, and form taps, each designed for specific threading operations. Selecting the correct thread tap depends on factors like the material undergoing the machining process and the thread type required.
Countersink Mill
Countersink mills are designed to create conical cuts in a workpiece to allow the head of a screw to sit flush with or below the surface of the material. These tools are indispensable in many assembly and construction applications where a clean, aesthetic finish is necessary.
Square End Mill
Square end mills are characterized by their flat-bottomed cutting ends, and many use them to create sharp, right-angled corners and flat-bottomed grooves. Unlike other end mills, they can produce sharp-edged cuts and precise square corners with high accuracy. They’re versatile CNC milling machines cutting tools, which are used for various cutting operations, including:
- Profiling. Precisely outlining the shape of a workpiece with clean, defined edges.
- Slotting. Cutting narrow, rectangular grooves with perpendicular sides.
- Plunge milling. Entering the workpiece vertically to create deep slots or pockets with sharp corners.
- Pocketing. Creating flat-bottomed cavities or recesses within a workpiece.
- Facing. Leveling surfaces for further machining.
- Engraving. Creating sharp lines and lettering.
Gear Cutters
Gear cutters are highly specialized cutting tools used for manufacturing gears with intricate profiles. The precision and accuracy required in gear cutting cannot be overstated, and gear cutters are designed to meet these stringent requirements. They come in various shapes and sizes to create different gear types.
Hollow Mill
Hollow mills are cutting tools with a unique design that resembles a pipe with cutting edges on the inside diameter. You can use them to cut hollow, cylindrical sections or trim a workpiece’s outside. However, their use is more limited compared to other cutting tools, and they’re often reserved for specific tasks where their unique capabilities are needed.
Fly Cutter
Fly cutters are simple yet versatile tools used in surface planing and slotting. They consist of a single-point cutting tool mounted on a rotating body and are known for delivering a fine surface finish on large areas. Fly cutters are often used when a larger cutting tool isn’t available or practical.
Twist Drill
Twist drills are the most common drill bits used in CNC operations. They feature a helical groove design and are employed for drilling holes into various materials. Twist drills are just one variety of CNC drilling tools, and you can find them in a wide range of sizes and coatings, each tailored for specific drilling tasks and material types.
Slab Mill
Slab mills are substantial cutting tools with high-speed steel edges designed to machine large, flat surfaces. They’re similar to face mills but typically have a single layer of cutting edges. Slab mills are particularly effective in heavy-duty milling operations where a significant amount of material needs to be removed quickly.
Thread Mill
Thread mills are specialized cutting tools designed for creating threaded holes in workpieces. Unlike traditional taps, thread mills use a helical interpolation method, providing versatility and precision in drilling operations. They offer a single-tool solution for multiple thread sizes, so you can use them for various materials and applications.
Which Materials Are Cutting Tools Made of?
CNC machining involves a lot of high temperatures and velocities, with some high-speed machines reaching 50,000 rpm. That’s why CNC machine cutting tools must be made from materials that can endure the stresses of cutting while maintaining a sharp edge for precision, such as:
- High-speed Steel (HSS). HSS is one of the most common materials used to make CNC tools because it can withstand high temperatures without losing hardness. This makes HSS tools particularly suitable for jobs with a high feed rate, where the friction generates significant heat.
- Carbon Steel. Carbon steel is more economical than HSS but doesn’t have the same level of heat resistance and durability. Therefore, such tools are typically used in operations where the cutting speeds are lower, ensuring the longevity of the tool’s edge.
- Ceramics. Ceramics are valued for their high hardness and heat resistance, allowing them to maintain sharpness even at high temperatures. However, ceramic cutting tools can be more brittle, so they might not be the best choice for operations involving high impact or variable feed rates.
- Carbide. Carbide is harder than HSS and retains its hardness at even higher temperatures. This makes it ideal for speed-intensive machining. Carbide tools also have a longer service life, which can improve the efficiency of your manufacturing process.
- Diamond. Its exceptional hardness allows for a superior surface finish on machined parts and an extended tool life when machining abrasive materials. However, diamond tools are expensive, so use them only in applications where their benefits justify the cost.
Best Uses for Each Material
As mentioned, the material of your CNC cutting tool is very important for the outcome of your project. Here’s a quick overview of what the individual materials are best suited for:
| Material | Best Use |
| Ceramics | Finishing high-temperature alloys, superalloys, and composites: milling, threading, turning |
| High-speed steel (HSS) | Roughing operations, machining softer materials: milling, drilling, slotting, profiling |
| Carbon Steel | Light machining of mild steel and other soft metals: drilling, tapping, threading, simple milling |
| Carbide | General-purpose CNC machining: milling, drilling, reaming, engraving, profiling |
| Diamond | Finishing operations for highly abrasive materials: polishing, grinding, engraving |
Conclusion
Thank you for reading this detailed guide on all the tools that play a role in shaping materials to exact specifications. Remember that the choice of tool impacts the quality of the finished piece and affects machining efficiency and tool longevity. Therefore, serious consideration is required.
After you select the tool you deem most suitable for your project, ensure you use it properly to avoid any problems. By using the capabilities of different CNC cutting tools, you can optimize your processes to produce parts that meet stringent requirements for precision, accuracy, and consistency.
FAQs
1. Can the same cutting tool be used for different materials?
Of course! The same cutting tool can be used for various materials, but its effectiveness depends on the material’s hardness, toughness, and thermal properties. Optimal cutting speeds and feeds differ, so a tool suited for one material might perform poorly or wear quickly with another.
2. What are the signs of a worn-out cutting tool?
A worn-out cutting tool exhibits increased cutting forces, higher temperatures, poor surface finish, and cutting-edge chipping or blunting. Excessive tool wear can cause dimensional inaccuracies and increased power consumption during machining.
3. How do tool coatings affect the lifespan of a cutting tool?
Tool coatings can significantly extend the lifespan of a cutting tool by providing thermal protection, reducing friction, and increasing hardness. This results in higher cutting speeds, improved wear resistance, and better performance in difficult-to-machine materials.