![]() ![]() ![]() While a bevel is a slope from a horizontal or vertical edge. A chamfer is typically a 45-degree angle added to the edge of a feature design. A fillet differs from chamfers and bevels because they don’t have a radius. A fillet is a sharp-edge-breaking feature that specifically adds a radius, either concave or convex, to the interior corner of a part. All these features create a similar design whereby a sharp edge is somehow broken. Fillets vs Other Design Featuresįillets can be easily confused with other design features such as corner radiuses, chamfers, and bevels. This article will expose the cases in which fillets are not beneficial, optimal, and necessary (hint: corner fillets), so you can start tweaking your designs to be more cost-effective and more readily manufacturable. This end mill cutter fillet machine tool is programmed to follow the edge of the part and it creates a high-quality fillet.įillets are still useful and even increasingly relevant in the 2022 design world, especially when parts are destined for CNC machining, which will be the primary assumption in the following examples. In machining, a fillet occurs along the part’s edge and is most likely made with a CNC fillet tool such as a corner rounding end mill tool. A fillet is created between the adjacent lines and faces in 2D and 3D CAD models, curving the surfaces between two lines or planes. There are two components of fillet engineering: designing fillet geometry and designing fillet machining. ![]() Fillets are added to increase the strength (by reducing the stress concentration) of the edge of a part or improve the part’s look. Either a part is entirely devoid of fillets, and most or all edges are well-defined, or the part’s designer decided to take the opposite route, and every single edge and corner is rounded with some size of fillet radius. Fillets are one of those mysterious design features for which there seem to be no clearly defined rules. ![]()
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