Grinding wheels are a common tool used in various industries for different types of grinding processes. The selection of the appropriate grinding wheel depends on the specific application, the material to be ground, and the desired finish. Here are some of the most common types of grinding wheel:

1. Straight Wheels - Straight wheels are the most commonly used type of grinding wheel. They are typically used for grinding flat surfaces, and their edges are relatively sharp. They come in a variety of sizes and are made of different abrasive materials such as aluminum oxide and silicon carbide.
2. Cylinder Wheels - Cylinder wheels are used to grind curved surfaces or to create cylindrical shapes. They are available in various sizes and shapes and are usually made of aluminum oxide or silicon carbide.
3. Dish Wheels - Dish wheels are used for grinding bevels and edges. They have a shallow, dish-like shape and are made of materials such as aluminum oxide or silicon carbide.
4. Tapered Wheels - Tapered wheels are used for grinding threads, gear teeth, and other similar parts. They have a tapered shape and come in different sizes and materials.
5. Diamond Wheels - Diamond wheels are used for grinding hard and brittle materials such as glass, ceramics, and carbide. They are expensive but offer high precision and durability.
6. CBN Wheels - CBN wheels are used for grinding hardened steels and other materials that cannot be ground with conventional abrasives. They are made of cubic boron nitride and offer high precision and longer life than conventional grinding wheels.

In conclusion, choosing the right type of grinding wheel is crucial for achieving the desired finish and efficiency in the grinding process. Therefore, it is important to consider the specific application, material, and desired finish before selecting a grinding wheel.