How is the bend radius measured?

The correct answer is based on the standard practice within aviation mechanics when dealing with bend radii. Measuring the bend radius to the inside ensures that you accurately capture the minimum radius the material can bend without experiencing damage, such as cracking or stress points. This is crucial because the inside of the bend is where the material is actually compressed, and knowing this measurement helps in ensuring structural integrity when forming parts.

In the context of structural components, particularly in aviation where safety and performance are paramount, understanding how to measure the bend radius correctly is essential for compliance with specifications and for maintaining the reliability of the components. Various materials have different tolerances, and knowing the inside radius aids in adhering to these tolerances to avoid failure during operation.

This measurement convention typically applies unless specified otherwise in technical documents or engineering drawings, emphasizing the importance of clear communication in engineering practices. Proper adherence to this standard helps ensure the performance and longevity of the aviation structures being built or repaired.