Which of the following is NOT a safety precaution when using power tools in sheet metal work?

Wearing loose clothing is not a safety precaution when using power tools in sheet metal work. In fact, wearing loose clothing can increase the risk of entanglement in machinery. Proper safety precautions emphasize the importance of wearing fitted, protective clothing that minimizes the chance of fabric catching on moving parts.

On the other hand, safety glasses are essential for protecting the eyes from flying debris, which is common when cutting or shaping sheet metal. Using guards on machines is also a critical safety measure, as these guards are designed to prevent accidental contact with cutting tools and moving parts. Additionally, ensuring a clear workspace is vital to prevent trips and falls, allowing for safe maneuvering around equipment and materials. Each of these actions contributes to a safer working environment in sheet metal operations.