🔍 Key Concepts

• Proper care and storage of hand files in a marine engineering or repair shop • How oil or grease affects friction and cutting action between a tool and metal • What happens to dust, filings, or chips when they contact an oily or sticky surface

💭 Think About

• Think about what a file is supposed to do when it is used correctly on metal. How does its rough surface interact with the work? • If the file’s surface is covered with oil, will the teeth bite into the metal more, less, or the same? What effect would this have on control and cutting quality? • When fine metal particles and dust are produced, how would an oily coating on the file change what happens to those particles?

✅ Before You Answer

• Check how lubrication (oil) usually affects friction between two surfaces in contact. • Consider whether an oily surface would make it easier or harder for particles to stick in the file teeth. • Before choosing, ask: could more than one of these listed effects happen at the same time when a file is oily and stored away?