The beauty of machines today is that they help to improve precision and accuracy by a mile. And when it comes to some of the best machines of the bunch on accuracy, CNC machines take the cake.
Here’s the thing, though – CNC machines come in different types, and this means that you have to deal with an abundance of parts across the board. In this article, we will look at several notable forms of CNC machining, as well as the parts that make them possible.
Detailed Overview of CNC Machine Tools Types
Without further ado, let’s take a look at the different tools that make CNC machining happen. As you would imagine, these tools tend to vary based on the type of operation you’re running. So, for instance, the CNC cutting tools will be different from, say, the tools for CNC forming.
So, let’s take a look:
Cutting Tools
One of the most prominent CNC machining operations is CNC cutting. There are different types of CNC machine tools that work here, as you can imagine, but the most notable ones include:
End Mills
An end mill is a cutting tool that spins. It comes with cutting edges that stand at its sides, as well as its bottom. In most cases, you see end mills working in processes like slotting, contouring, and pocketing. And with this unique shape, it is able to achieve precise and accurate cuts, while also providing a reliable finish.
Drill Bits
When the need arises to create holes in a material, a CNC machine will most likely make use of a drill bit. You can find them in different sizes and configurations, so it’s important to match the right option with the process you are undertaking.
Insert Cutters
These cutters work in CNC precision machining mostly. They come with replaceable carbide inserts that are placed on a tool body. With this shape, the tools can easily be swapped when they get damaged or when they wear out. As a side benefit, they provide opportunities for you to save money and for them to last as long as possible.
Router Bits
These are quite similar to end mills. The difference, however, is that they are particularly designed for shaping, trimming, and other routing operations. With different profiles available, router bits are applicable for different cutting tasks. So, you have your pick of the litter here.
Laser Cutters
Of course, these are the primary operators in any CNC laser cutting task. A laser cutter will make use of a high-powered laser beam to sift through different materials – plastic, wood, metal, anything.
Laser cutters are mostly renowned for their high precision, as well as their ability to move through intricate workpieces without breaking a sweat.
Plasma Cutters
These cutters make use of plasma torches to cut through materials. It’s important to note that the material itself needs to be electrically conductive, so we are talking about stuff like aluminum, steel, copper, etc.
Waterjet Cutters
Instead of plasma torches, a waterjet cutter takes a vat of water moving at very high speeds and uses it to cut through materials. The water is mixed with an abrasive substance, and the waterjet cutter provides a reliable and seamless cut that weaves through the workpiece.
Plus, you don’t have to work with just conductive materials. In fact, waterjet cutters work with even stone!
Forming Tools
CNC forming is actually quite similar to CNC cutting in the sense that they look to shape materials. However, while the latter focuses on cutting the material to shape, the former focuses more on using deformation for its shaping.
To that end, the list of machine tools used in CNC forming is actually quite extensive. Some of the options available include:
Press Brakes
A press brake is a machine whose job is to bend sheet plates and metal materials. In a press brake setup, you usually see a flatbed and a powered upper tool that moves straight up to press the workpiece against a lower tool. This action creates a bend to the right angle, allowing you to create the desired part.
Roll Forming Machines
These CNC machining tools slowly shape continuous coils or strips of metal by passing them through a steady set of rollers. From there, the rollers bend the material into the shape you want without breaking a sweat.
Tube Benders
Also known as tube bending machines, these tools help to bend pipes and tubes to fit specific formulations. You can choose the angle you want, the radius of the tube, and much more.
Most tube benders make use of methods such as rotary draw bending, compression bending, and mandrel bending to manipulate the material. They are ideal because they don’t cause any wrinkles, and they won’t make the material collapse too.
Hydraulic Presses
The hydraulic press uses brute force with the use of a hydraulic cylinder. With this tool, it is able to shape the material based on your specifications.
Most hydraulic presses work in different forming processes, from punching to stamping to deep drawing and much more.
Die Casting Machines
In the die-casting process, you inject a molten metal into a mold cavity in the presence of intense pressure. As both of them solidify, the mold is able to shape the metal, offering the perfect complex part no matter how tight the tolerance is.
Presses & Hammers For Forging
The forging process makes use of comprehensive force to shape a metal. And, this force is usually applied with the use of presses or hammers. Thanks to the work of CNC-controlled forging tools, you will be able to achieve optimal control over the shaping process and product and create a part with the highest amount of strength.
Rotating Tools in CNC Machines
Several CNC operations – from drilling to cutting to milling – need a form of rotating action. And, this means that rotating tools are especially popular in the CNC machining operation.
The CNC milling machine tools don’t necessarily have to be the same tools that enable CNC drilling, but these rotating tools tend to have the same working principle – they are attached to the spindle of the machine, and they rotate very fast to take out any material from the workpiece.
To that end, here are some of the major rotating tools that work as part of CNC machinery:
Reamers
A reamer is a spinning cutting tool that is used to enlarge and finish a current hole in its accurate dimensions. In most cases, you find them with different cutting edges, working to achieve a perfect drill and tight tolerances. Plus, they can help you to achieve a smooth surface finish.
Tap Tools
A tap tool’s job is to help thread a hole inside your workpiece. These tools come in different types, from hand taps to spiral flute taps and more.
Essentially, a tap creates internal threads by cutting into the material once they start to rotate. This makes it possible for you to add bolts, screws, and other threaded fasteners without any issues.
Milling Cutters
These are spinning tools that mostly aid milling operations. You can get them in different configurations, ranging from tapered cutters to ball-nose cutters and corner-radius cutters. Whatever option you choose, you can rest assured of precision in both the surface finishing and the material removal.
Boring Bars
If you have an existing hole and you need it to be enlarged, or you want to create an external feature like a cavity, then boring bars are the tool for you.
Generally, you mount boring bars on the spindle of a CNC machine, and you can adjust it to achieve the depth and diameter you want. This flexibility makes them very impressive, especially in the CNC industry where precision is everything.
Fly Cutters
These are single-point cutting tools that help to facilitate seamless flat-surface CNC machining. They come with one cutting tool, which is placed on a spinning spindle. And in most cases, you find them in operations where you need flat, smooth surfaces to be produced.
Abrasive CNC Tools
It might not necessarily be the most popular CNC machining process, but abrasion can get a lot of work done. The CNC machining equipment used in this process are quite extensive, with some of them including the following:
Grinding Wheels
These are abrasive wheels that enable functions like shaping, grinding, and sharpening your workpiece. They come with abrasive particles that are tied together with a matrix material, and you can find them in different sizes and shapes.
Sanding Belts
For sanding and finishing operations, these abrasive belts work magic. You usually wrap them around rotating pulleys or drums, and they help you to take out any excess material from the workpiece so you can get the perfect, smooth finish.
Grinding Stones
Also known as grinding bits or mounted points, grinding stones are abrasive tools that help with shaping and precision grinding. They are positioned atop the CNC machines, spinning at high speeds to enable material removal without a hitch.
Wire Brushes
Before any CNC machining operation can be done, you will need to prepare your surface. And when you are done with the operation, you will need to clean things up as well. Wire brushes are CNC machining tools that help you to do both.
With their wire bristles, these brushes rotate and can take out dust from different materials. At the same time, they are functional against other contaminants like paint, rust, and more.
Polishing Pads
For those buffing and polishing applications, these abrasive pads are more than perfect. Their job is to help with polishing compounds in order to achieve a surface with a high gloss finish, and they especially work for materials like glass, stone, and metal.
Abrasive Waterjet Nozzles
The name pretty much says it all – these nozzles work best for waterjet cutting CNC machines. With their high-pressure water streams and abrasive particles, these nozzles help to facilitate seamless cutting across a broad spectrum of materials and composites.
Specialty Tools in CNC Machining
Moving on, we have a few critical specialty tools that tend to help improve the efficiency of CNC machining. Basically, these tools offer considerable levels of unique capabilities that allow them to meet your machining needs, and a few of them include:
Thread Mills
If you need to machine a thread into a material, then a thread mill is perfect. These mills are accurate when milling threads, and they work well because they produce both internal and external threads at once.
Keyway Cutters
As the name suggests, these cutters help to cut keyways – essentially, grooves that are built into shafts and which can accommodate keys and transmit enough torque. You can find the cutters in different configurations and sizes, and they help you to produce different widths in keyways.
Gear Hob Cutters
You know the teeth of gears? Well, gear hob cutters are tools that help you to cut them on cylindrical workpieces. A gear hob cutter is built to be very accurate when cutting teeth profiles, and they are beneficial because they work with different types of gears.
Broaching Tools
When you need to create an internal or external profile and you have really complex shapes, then a broaching tool is what you call. The entire broaching process is pretty fast, and its efficiency also makes it very impressive generally.
Burnishing Tools
You could have a surface finish already, but a burnishing tool can help you to improve it by magnitudes. These tools also help to improve dimensional accuracy by compressing the surfaces and smoothing them properly on a workpiece.
T-slot Cutters
The specialty of these cutters is to help machine T-shaped slots right on top of a workplace. They help to secure fixes and work-holding devices on the tables of machines, and you can find them in different configurations and sizes where they hold different workpiece materials and T-slot dimensions.
Factors to Consider When Selecting CNC Machine Tools
It’s pretty obvious that we have so many CNC machines and components to consider. But, how do you actually know what to choose when you are getting CNC machining tools? Here’s a checklist that could help you out:
What Type Of Machine Is It?
First, it’s important to consider the specific CNC machine type. This way, you will be able to know the tools and components needed, as well as whether there are any synergies to be explored.
The Capacity & Size Of The Machine
Also, look into the capacity and size of the machine tool itself. Everything from the working envelope to the maximum weight capacity and much more should be considered, and ensure that your machine will be able to accommodate your workpiece.
Optimizing Precision In Operations
Examine how accurate the CNC machine tool will be. Does it have positional accuracy? Can you use it to repeat processes? What will the surface finish look like? Questions like these will help you get a perfect gauge of what you’re working with.
The Power Of The Spindle
Always look at the CNC machine tool’s spindle and gauge whether it is fast and powerful enough. With enough speed and power, you will be able to cut quicker and ensure a reliable surface finish.
Tooling Options & Switches
Evaluate all the options available for tooling, as well as the available tool changer system for your tool. Focus on having a machine with a versatile tooling system that will be able to work with your requirements, and this should make it much easier for you to swap parts if necessary.
How Do You Control It?
Choose a CNC machine tool with a user-friendly control system. It should be intuitive, and you can also look into compatibility with appropriate computer-aided software options.
Can You Afford It?
Per usual, the affordability question is one you want to consider. Remember – just being able to afford it won’t cut it. The tool also needs to be of high quality.
Conclusion
CNC machining is an impressive operation that yields solid dividends, especially when done right. That said, you need to also make sure that you have the right tools for your machining operation, so you can achieve optimal results.
If you need any additional help when making the right choice, then feel free to reach out to us at HM.