Conventions for small blends: Are “runouts” used as small curves to depict how fillets blend into plane surfaces that are tangent to cylinders in orthographic views?

Introduction / Context:
Orthographic drawings use conventional breaks and runouts to show how curved features such as fillets and rounds blend into adjacent surfaces. A runout is a short curved transition indicating the smooth tangential merge of a radius into a plane or another curved surface, improving readability without over-detailing.

Given Data / Assumptions:

• Fillets/rounds are tangential transitions, not sharp intersections.
• Orthographic projection simplifies depiction using conventions.
• Runouts shorten and clarify the representation at edges.

Concept / Approach:
Use runouts to visually indicate continuation of curvature where a full geometric construction would clutter the view. This matches drafting standards that favor clarity while preserving intent about tangency and blend.

Step-by-Step Solution:

Verification / Alternative check:
Compare with detailed CAD sections; the physical blend is smooth. The runout convention communicates this efficiently in 2D views.

Why Other Options Are Wrong:
Limiting runouts to chamfers, perspective, or isometric sketches misstates their orthographic drafting role.

Common Pitfalls:
Overdrawing the runout or misplacing it so it implies a non-tangent junction; omitting necessary radius callouts elsewhere.

Final Answer:
Correct