True or False: A flat file should only be used in one direction and should not be scraped back and forth across the surface.

Using a flat file in one direction is a fundamental technique in metalworking and assembly processes. This approach ensures that the cutting action of the file works effectively and reduces the potential for damaging the surface being worked on. When a flat file is used correctly, it removes material efficiently and creates a smooth surface without causing unnecessary wear on the file itself.

Filing in one direction helps maintain proper control and precision, allowing operators to shape and finish parts accurately. Scraping back and forth can lead to erratic surface finishes and might also weaken the file over time, as the teeth can become dull or break due to stress.

The technique of using a flat file in a single direction is especially important in applications where precision is key, such as in aerospace assembly, where the integrity of components is critical for safety and performance. Thus, the statement that a flat file should only be used in one direction is true.