Primary SEO keywords: fillet vs chamfer, mechanical design, CAD design, stress concentration, edge treatment
If you have spent any time in CAD, you have probably faced the small question that turns into a manufacturing discussion: fillet or chamfer? Both are simple features, but choosing the wrong one can affect strength, machining, assembly and even cost.
What a Fillet Actually Does
A fillet creates a rounded transition between surfaces. In loaded components, that radius can reduce a sharp corner and help reduce stress concentration. The radius should still be realistic for the manufacturing process and available tooling.
When a Chamfer Makes More Sense
A chamfer removes a corner at an angle. It is useful for deburring, guiding a part into assembly, creating a lead-in for a fastener, or making a machined edge easier to produce.
The Practical CAD Rule
Do not add a fillet just because the model looks nicer. Ask what the edge does. If the edge carries load, consider a functional radius. If the edge needs deburring or assembly clearance, a chamfer may be more practical.
Manufacturing Matters
Large internal fillets can require larger cutters or special tooling. Very small chamfers may also be awkward to machine. A five-minute discussion with manufacturing can save hours of redesign later.
Final Check
Before releasing a model, check whether the edge is driven by strength, manufacturing, assembly or appearance. That simple question usually leads to a better design.
Keep learning: Explore more practical engineering articles in the GetCADFile Design Guide.