Considering a grinding wheel and a regulating wheel in regard to the centreless grinding machine working principle, the ________ is of greater diameter and has a high rotational speed, whereas the _______ is of smaller diameter and has a low speed.
grinding wheel; regulating wheel
Understanding Centreless Grinding Machine Wheels
A centreless grinding machine is a type of machine tool used for grinding the external surface of cylindrical objects. Unlike conventional grinding machines, it does not use centers to hold the workpiece. Instead, it relies on three main components: a grinding wheel, a regulating wheel, and a work rest blade.
The question focuses on the characteristics of the grinding wheel and the regulating wheel in this setup, specifically their diameter and rotational speed.
Comparing Grinding Wheel and Regulating Wheel
Let's look at the roles and typical characteristics of the grinding wheel and the regulating wheel:
- Grinding Wheel: This is the primary tool responsible for material removal. It is a large, abrasive wheel that rotates at a very high speed to effectively grind the workpiece surface. Due to the need for significant surface speed for grinding action and often being the main driver of the process, it is typically the larger diameter wheel.
- Regulating Wheel: This wheel is usually made of a rubber or plastic-bonded abrasive and rotates at a much slower speed compared to the grinding wheel. Its main functions are to control the workpiece's rotation and longitudinal feed rate during the grinding process. Its speed and angle relative to the grinding wheel determine how fast and smoothly the workpiece is processed. It is typically of a smaller diameter than the grinding wheel.
Based on their functions, the grinding wheel needs high speed and is generally larger, while the regulating wheel needs low speed for control and is generally smaller.
| Feature | Grinding Wheel | Regulating Wheel |
|---|---|---|
| Primary Function | Material removal (grinding) | Control workpiece rotation and feed |
| Typical Diameter | Greater | Smaller |
| Typical Rotational Speed | High | Low |
| Material | Hard abrasive (e.g., Aluminium Oxide, Silicon Carbide) | Rubber or plastic bonded abrasive |
Filling the Blanks
The sentence states: "Considering a grinding wheel and a regulating wheel in regard to the centreless grinding machine working principle, the ________ is of greater diameter and has a high rotational speed, whereas the _______ is of smaller diameter and has a low speed."
From our comparison, the wheel that is typically of greater diameter and has a high rotational speed is the grinding wheel.
The wheel that is typically of smaller diameter and has a low speed is the regulating wheel.
Therefore, the correct words to fill the blanks are "grinding wheel" and "regulating wheel" in that order.
Important Questions from Different Machining Processes
Which of the following is a naturally occurring abrasive mineral?
Which of the following indicates the open structure of the grinding wheel?
In grinding, which of the following numbers represents the very open structure?
The size of the grinding wheel is represented by-
Grinding wheel with large grain size is used:
