Edge

An edge is the curve where two faces of a solid model meet, such as the line where a flat top face meets a cylindrical side, or the curve of a fillet's boundary. Edges bound faces and meet at vertices in a boundary representation (B-rep).

Why edge condition matters

A sharp edge versus a broken (chamfered or filleted) edge is one of the most common small but consequential differences a drawing specifies, since a sharp edge can be a burr risk or a stress concentration that a broken edge avoids.

Where edges appear on the drawing

Called out directly with a chamfer or fillet dimension, or implied by a general "break all sharp edges" note.

Common mistakes

Leaving edge condition unspecified and assuming a sharp edge is fine; many factories will break edges by default, which can conflict with a functional requirement for a genuinely sharp edge.

What is the difference between an edge and a face?

A face is a bounded surface; an edge is the boundary curve where two faces meet.

Why do drawings often say "break all sharp edges"?

Because a sharp edge left as-machined can be a burr risk or unsafe to handle, and a small, unspecified break is usually acceptable unless stated otherwise.

Does every edge need its own dimension?

No, most edges are left to general tolerance or a blanket note; only functionally important edges get an explicit chamfer or fillet callout.