Verrundung vs. Fase: Erkundung gängiger Kantendesigns von CNC-Komponenten

In the manufacture of CNC components, the edges of most components are designed to have either a curved or angled finish. This is a deliberate decision made during the design process after considering factors such as functionality and aesthetic requirements. In this article, we explore each of these edge designs and how they compare against each other.

Fillet vs. Chamfer: Overview

CNC components are manufactured by CNC (computer numerical control) systems. These systems have software, a processing tool, and a control unit. These systems are fed a design schematic and they turn the design into a complete product. Components with fillets and chamfers are examples of components made by this system. 

For this article, we will only focus on the chamfer and fillet and not on the CNC machine or the other parts of the component. Therefore, let us start by defining chamfer and fillets and exploring some of their distinct features. 

Was ist ein Filet?

A rounded exterior or interior edge of a CNC component is known as a fillet. The phrase round could mean a lot of things based on the design, manufacturing standards, and material used.

Sometimes, fillets are confused for bevels and corner radii. To differentiate the three, engineers and designers use geometric characteristics of each. The best way to differentiate fillets from all three is by keeping in mind that fillets have a measurable radius while the others do not.

This is mostly applicable in metallic components to remove the sharp edges that could lead to accidents if left unattended. Some other benefits of this are to improve the load bearing of the edges and to avoid damage to the edges.

What is the Use of a Fillet?

Designers incorporate smooth edges in their designs for either of two broad reasons. On one hand, a fillet helps increase the aesthetic or functionality of the component. 

For the aesthetic aspect, you can agree that rounded corners look better than sharp corners. According to researchers, the human eye perceives round corners as more natural than sharp corners. 

On the other hand, fillets are functional in the sense that they protect the edges from damage that comes from various forms of stress. Additionally, fillets increase the load-bearing capacity of a component through stress redistribution, increase in cross-sectional area, and increased fatigue resistance.

How Fillets are Designed

Fillets have a characteristic concave or convex shape depending on their position. To elaborate, when a fillet is placed on the exterior of the edge, it will have a convex shape while interior edges have a concave shape. The only consideration made during the design is the radius of the fillet, which is created using the radial tool path in most 3D software.

Was ist eine Fase?

Edges that do not require smooth finishes can be angled at about 45 degrees to achieve similar functional and aesthetic appeals of fillets.

Chamfers resemble bevel cuts. They have the same appearance. However, the main difference between them is that a bevel has a sloped surface while a chamfer has an angled surface. So in a way, you could say that a bevel is a type of a chamfer. Also, chamfers are almost all the time angled at 45 degrees while the angle of a bevel can vary.

The Purpose of a Chamfer

Like a fillet, a chamfer serves both functional and aesthetic purposes. The main purpose is that it eliminates the sharp edge of a component that occurs when there is a machine cut. 

The other purpose of a chamfer is to improve the mechanical properties of a component. This specifically means reducing stress concentration. However, chamfers do not redistribute stress as well as fillets. Still, this does not disregard their functional purpose.

For components that are meant to be interlocked together, chamfers contribute to a seamless assembly of parts. In other words, the female and male parts of a chamfered component interlock easily due to this feature.

How are Chamfers Made?

In 3D design, chamfers are made using a command such as the CHAMFER command in AutoCAD software. The processing tool in the CNC system then cuts the 45-degree angle as angewiesen by the software in the system. For manual cuts, manufacturers can use a chamfer router bit or a V-groove. These machines are designed specifically for making chamfers.

Fillet vs. Chamfer: Features

These two types of edge finishes have distinct features or characteristics. For the most part, these features are there to describe them more. Also, they help you understand why they are both a thing. Let us look at their features.

Features of Fillets

Some of the common features of fillets include;

  • Helps in stress distribution. Stress distribution is the management of how internal forces inside an object are distributed. Provided that sharp corners are stress concentrators, the round nature of fillets helps distribute this stress. 
  • Softness sharp edges. Sharp edges have the tendency to cause harm to people or the component itself. Round edges on the other hand make softness these edges, which improves the safety of people and maintains the component in good condition.
  • Verbessert die Ästhetik. You can agree that round corners appear better compared to sharp corners. This is a vital consideration in the manufacture of components where appearance is a major concern. 
  • Verbessert die Kraft. Structural integrity is a design feature that is widely sought after in several industries. Filleting is one way this can be achieved. Specifically, fillets enhance the durability of most components.

Features of Chamfers

The features of chamfers are somewhat related to those of fillets but with slight differences. Some of these features include;

  • Promotes ease of assembly. Components that need to be assembled would be better off chamfered rather than filleted. The 45-degree angle of the chamfered edge of the female will easily merge with that of the male edge.
  • Verringert Stress. Just like the fillet, a chamfer is also responsible for reducing stress on the edge of the component. However, you should note that chamfers do not redistribute stress like fillets do.
  • Protect edges from damage. Sharp edges are prone to damage, so chamfering is a way to protect them from damage that can occur from mechanical stress. 
  • Reduce the weight of a design. In design, the final weight of a component is crucial, especially if it influences its cost and usability. In such cases, chamfering can be used as a control mechanism.
  • Improves manufacturability. The aspect of easy assembly can be said to be a feature that improves the manufacturability of a product.

Unterschiede zwischen Verrundung und Fase

From the design, features, and application of these two edge designs, you can see their differences. Let us break them down.

  • Herstellungskosten – Fillets are more difficult and expensive to create while chamfers are easy and inexpensive. 
  • Komplexität des Designs –  While this can be influenced by several factors, it is generally known that fillets are harder to design than chamfers in most CAD software. 
  • Anwendung – Fillets are primarily used to improve load-bearing capacity while chamfers enable better interlocking of mating ends.
  • Stärke – Generally, fillets form stronger edges than chamfers. This is due to the even distribution of stress and better fatigue resistance compared to chamfers.

Similarities Between Fillet and Chamfer

While fillets and chamfers are completely different in appearance, they have certain similarities that you should know. Some of them include;

  • Optik – Both fillets and chamfers are focused on increasing the aesthetics and functionality of an edge of a component. In other words, they are both used to ease sharp corners that can result from machine cuts. This means they both serve two major purposes.
  • Materialverbrauch – When a component has been chamfered or filleted, the structural integrity and material composition of the final product remain uncompromised. As a result, the weight of the final product is reduced.
  • Sicherheitsmerkmal – Both fillets and chamfers fall in the category of safety features of CNC components. As we have repeatedly noted, sharp corners can be dangerous if left unattended.
  • Versatily – Fillets and chamfers are versatile in the sense that they can be applied to a diverse range of components to achieve the outlined purposes. Therefore, they are quite essential in material design. 

Benefits of Fillets and Chamfers in Product Design 

Product design is one of the most essential elements considered when designing and manufacturing CNC components. This is because the design of the component has the largest impact on several aspects of it. Therefore, design features such as fillets and chamfers are quite beneficial. 

Edge protection is a major benefit of these design features. This means that the edges of the machined parts are protected from damage. As a result, this makes the product more resilient and durable.

Another benefit of fillets and chamfers is the visual appeal. At HM, we design and manufacture several metal-based CNC components. Aesthetics is one of the primary objectives of finishing the edges of these components either with a fillet or a chamfer. 


Designing a CNC component without considering the edge finish is a thing of the past. The majority of manufacturing is discovering the need for either fillets or chamfers. As such, there is more harmony and consistency in the industry. Ultimately, this is beneficial for you as the consumer and for us as the manufacturers of the CNC components.

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