Edge treatments on cylindrical parts — ease of handling and assembly Which term describes an angled surface applied to the end edge of a cylinder to remove the sharp corner and make handling or insertion easier?

Introduction / Context:
Edges on cylindrical parts are often modified to improve safety, assembly, and performance. Selecting the correct term ensures machinists apply the intended geometry and inspectors verify the correct feature.

Given Data / Assumptions:

• The feature is applied at an edge to ease handling or insertion.
• The modified surface is angled, not curved.
• The context is standard mechanical drafting terminology.

Concept / Approach:
A chamfer removes the sharp edge by cutting at a specified angle and length (for example, 1 x 45 degrees). It is common at the ends of shafts for easier bearing insertion or to prevent burrs from interfering with assembly. A fillet creates a curved interior corner; a round would be the exterior curved corner. A taper changes diameter gradually along a length, not just an edge. A lug is a protruding tab used for attachment, unrelated to edge treatment.

Step-by-Step Solution:

Verification / Alternative check:
Typical callouts like “CHAMFER 0.5 x 45°” appear on shaft ends and holes for lead-in; CAD tools include chamfer features to create this geometry quickly and consistently.

Why Other Options Are Wrong:

• Fillet: interior curve, not an angled edge.
• Taper: long gradual diameter change.
• Lug: protruding attachment tab.

Common Pitfalls:

• Failing to specify both size and angle, causing ambiguity in manufacturing.
• Using a round when clearance requires a straight chamfer.

Final Answer:
Chamfer