Which operation involves particles rubbed off when smoothing or shaping with a file?

Which operation involves particles rubbed off when smoothing or shaping with a file?

• A. Filing
• B. Forging
• C. Casting
• D. Bending

Answer: (A)

Material removal by abrasion is the idea here. When you smooth or shape a workpiece with a file, the file’s abrasive teeth scrape away tiny bits of metal as you push or pull it along the surface. Those tiny metal particles are called filings, produced by the abrasive action of the file's grit. This is how the surface is finished and shaped precisely. The other operations involve deforming or melting metal rather than removing material by abrasion: forging shapes metal by hammering or pressing; casting pours molten metal into a mold; bending changes the form by bending without cutting. So, the process that involves particles rubbed off when smoothing or shaping with a file is filing.

Material removal by abrasion is the idea here. When you smooth or shape a workpiece with a file, the file’s abrasive teeth scrape away tiny bits of metal as you push or pull it along the surface. Those tiny metal particles are called filings, produced by the abrasive action of the file's grit. This is how the surface is finished and shaped precisely. The other operations involve deforming or melting metal rather than removing material by abrasion: forging shapes metal by hammering or pressing; casting pours molten metal into a mold; bending changes the form by bending without cutting. So, the process that involves particles rubbed off when smoothing or shaping with a file is filing.