Definition

Noun: A rotating disc or wheel made from a hard, abrasive material (typically emery or a similar abrasive compound bonded to a central hub). It is used for grinding, shaping, polishing, or sharpening surfaces by friction.

Usage

An emery wheel is a tool mounted on a machine (like a bench grinder) and spun at high speed. It is used to wear down, smooth, or sharpen materials such as metal, stone, or glass through abrasive contact.

Examples

• The machinist used an emery wheel to sharpen the dulled drill bits.
• For a smooth finish on the weld, you should run it against the emery wheel.
• Safety goggles are essential when operating an emery wheel to protect your eyes from flying sparks and debris.

Advanced Usage

• Specification by Grit: Emery wheels are often specified by their grit size (e.g., coarse-grit wheel, fine-grit wheel), which indicates the size of the abrasive particles and thus the aggressiveness or smoothness of the grind.
• Dressing the Wheel: The process of truing and cleaning the surface of a worn or loaded emery wheel with a tool called a "dresser" is known as "dressing the wheel." This restores its cutting efficiency.

Variants and Related Words

• Grinding wheel: A more general term for any abrasive wheel used for grinding, often used synonymously with "emery wheel."
• Abrasive wheel: An even broader term encompassing all wheels used for cutting, grinding, or polishing with abrasive materials.
• Emery cloth/paper: Sheets of cloth or paper coated with emery abrasive, used for hand-sanding rather than on a powered wheel.

Synonyms

• Grinding wheel
• Abrasive wheel
• Sanding wheel (for finer grits)

Related Phrases/Idioms

• To be put to the grindstone: This idiom, meaning to be forced to work hard and steadily, evokes the image of sharpening a tool on a grinding stone, a precursor to the modern emery wheel. While not using the exact term "emery wheel," it is conceptually related to its function.
  • Example: With the project deadline approaching, the team was put to the grindstone.

Noun

1. a wheel composed of abrasive material; used for grinding