Which rolls are specifically designed to turn edges to right angles?

• A. Crimping rolls
• B. Wiring rolls
• C. Burring rolls
• D. Turning rolls

Answer: (C)

The correct answer, which identifies the rolls specifically designed to turn edges to right angles, is associated with burring rolls. Burring rolls are designed for the purpose of edge preparation, which includes turning and finishing edges to create a clean and precise right angle. This is particularly important in aircraft structural work where the integrity and fit of structural components are critical.

Turning rolls have a broader application, primarily involving the rotating and positioning of workpieces in various manufacturing processes but are not specifically focused on creating right-angle edges. Crimping and wiring rolls serve different functions; crimping rolls are used for folding and shaping materials rather than achieving right angles, while wiring rolls deal with the application of wire and are not related to edge turning tasks. Recognizing the specific functions of these rolls reflects the importance of understanding the different tools and processes used in aviation structural maintenance.