How Chamfers And Fillets Impact CNC Machining Costs

DALIAN, China - Sept. 13, 2021 - PRLog -- In the process of CNC machining parts, in addition to sharp corners (which are regular geometric figures between two connected surfaces or vertices), you can also choose to design the corners as chamfers or fillets.

Understanding the difference between these two phenomena is actually a basic factor that designers must consider. This is because the choice made will determine the success or failure of the part manufacturing, and also affect the machining cost of the part to a certain extent.

Including fillets and chamfers in your design may incur additional CNC machining costs and sometimes reduce production speed. It is important to weigh these and other factors before deciding whether to include chamfers and fillets in a part design.

This article will explain the conceptual information about fillets and chamfers, their advantages and disadvantages, and precautions when designing and using them.

What Is Chamfering?

A chamfer is an oblique or angled side or corner of a part design. It is the opposite of rounded corners. The chamfer is not a curved shape, but is straight and has an acute angle. The chamfered edge is inclined or angled to reduce the influence of the sharp corner and improve the fit of the mating parts.

Generally, the function of chamfering is to remove burrs. Some installation processes require special emphasis on chamfering, such as installation guidance, reduction of stress concentration, and ease of assembly.

What Is Fillet?

There are different definitions of rounded corners. However, in part design, the machinist refers to the rounded corner as the rounded part of the inner or outer edge of the design. The rounded corner design requires rounded edges, eliminates all sharp corners and contributes to the appearance and service life of the component.

They are three types of fillet mechanics: miter, concave, and convex fillets. On the inside, the rounded corners are concave, while on the outside, they are convex. Engineers use rounded corners to reduce stress on the parts. Therefore, the rounded corners help distribute the stress on a larger surface and prevent rapid deformation of the compressed part.

When the design needs to eliminate sharp edges and low stress concentration, fillet engineering is the best choice for machinists.
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