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+# Fillet Chamfer Last Atomic Skill
+
+## When to use
+
+- A machined part needs edge breaks, deburring chamfers, assembly lead-ins, stress-relief fillets, or small finishing rounds.
+- The edge treatment is secondary to the main body, holes, pockets, slots, and bores.
+
+## Do not use when
+
+- The rounded or chamfered profile is the primary defining shape, such as an O-ring groove, cam surface, ergonomic shell, or turbine blade.
+- A sharp edge is explicitly required for sealing, locating, scraping, or mating.
+- The chamfer/fillet would remove critical wall thickness around a hole, shoulder, or thin rib.
+
+## Recognition features
+
+- SolidWorks feature evidence such as Chamfer, Fillet, radius values, or angle-distance chamfers.
+- STEP evidence with conical or toroidal surfaces near final edges.
+- Descriptions mentioning chamfered edges, rounded corners, smooth transitions, edge relief, assembly ease, or stress reduction.
+
+## Core invariants
+
+- Apply edge treatments after primary solids, holes, bores, pockets, slots, and patterns are stable.
+- Keep edge treatment small relative to nearby feature size and wall thickness.
+- Use chamfer for lead-in/deburring and fillet for stress relief or smooth load transition.
+- Select specific edges; do not blindly fillet or chamfer every edge.
+- Preserve functional shoulders, datum faces, seal lands, and fastener seats.
+
+## Parameter roles
+
+- `chamfer_distance` defines bevel size.
+- `chamfer_angle` defines bevel angle, often 45 degrees when not otherwise specified.
+- `fillet_radius` defines round size.
+- `edge_set` defines which edges receive treatment.
+- `minimum_wall_after_edge_treatment` protects small holes, ribs, and pockets.
+
+## Construction sequence
+
+1. Complete the main body and all functional cuts.
+2. Identify functional edges that need lead-in, deburring, stress relief, or handling safety.
+3. Apply chamfers to hole entrances, exposed outer edges, or insertion edges.
+4. Apply fillets to internal corners, web transitions, and load-bearing transitions.
+5. Verify that holes, slots, shoulders, and bearing seats remain intact.
+
+## Common failures
+
+- Adding large fillets early and causing later cuts or patterns to fail.
+- Chamfering a bearing shoulder, seal land, or datum face that should remain crisp.
+- Using one global fillet radius across tiny holes and large outer edges.
+- Treating decorative edge rounding as more important than functional geometry.
+
+## Evidence summary
+
+- Current library evidence: 58 reviewed SCAD58 machined parts with final chamfer/fillet operations.
+- Latest run evidence: high-frequency accepted insights for `chamfer_edges`, `chamfer_edges_for_safety`, `apply_chamfer_to_edges`, `apply_fillet_to_edges`, and stress-relief fillets.
+- Frequent operations in the latest run: Chamfer and Fillet after Extrusion, Cut, HoleWzd, Pattern, and Revolution.
+- Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.
+
+## Retrieval metadata
+
+Triggers:
+- `fillet chamfer last`
+- `edge treatment`
+- `chamfered edges`
+- `filleted edges`
+
+Secondary triggers:
+- `deburr`
+- `assembly lead in`
+- `stress relief`
+- `smooth transition`
+- `edge break`
+
+Operation triggers:
+- `chamfer`
+- `fillet`
+- `apply edge treatment after cuts`
+
+Exclusions:
+- `primary rounded profile`
+- `sharp datum edge`
+- `seal land`
+- `cam surface`