Definition
A chamfer is a flat, angled surface that replaces a sharp edge or corner, typically specified by an angle and a distance (such as 45° x 0.5mm). Chamfers are used to remove burr risk, ease assembly, and reduce stress concentration at sharp corners.
Why chamfers add up even though each one is quick
A chamfer is usually a fast, cheap operation on its own, but on a part with many edges, a blanket chamfer requirement across all of them can add up in cycle time, especially if it requires repositioning to reach edges from multiple orientations.
Where it appears on the drawing
As an explicit angle and distance callout on a specific edge, or as a general note such as "break all sharp edges 0.2-0.5mm" covering unlabeled edges.
Common mistakes
Assuming a blanket chamfer note is free because each individual chamfer is trivial; on a geometrically complex part, reaching every edge can require extra setups or tool changes that add real time.
A chamfer is usually a fast, cheap operation on its own, but on a part with many edges, a blanket chamfer requirement across all of them can add up in cycle time, especially if it requires repositioning to reach edges from multiple orientations.
See how Blake reviews a partFrequently asked questions
Is a chamfer the same as a fillet?
No, a chamfer is a flat angled surface; a fillet is a rounded, curved surface replacing a sharp edge.
Why do most parts specify a chamfer on edges?
To remove sharp burr-prone edges, ease assembly by guiding mating parts, and reduce stress concentration.
Does a chamfer always need its own operation?
Often it can be combined with an adjacent milling or turning operation using the same tool, but complex geometry can still require a dedicated pass.