Question

With reference to the figure related to rock cutting by point attack tool, match the angle with corresponding name. 

• A. P-2, Q-4, R-1, S-3
• B. P-4, Q-2, R-1, S-3
• C. P-2, Q-4, R-3, S-1
• D. P-4, Q-2, R-3, S-1

Hint:

In rock cutting, the cutting angle, rake angle, wedge angle, and clearance angle are crucial for tool efficiency and wear resistance.

Answer 1

The Correct Option is A

The given figure represents various angles associated with rock cutting using a point attack tool. We need to match each angle with the corresponding name. 1. Angle P (α): This is the angle between the cutting edge and the surface being cut. This angle is known as the cutting angle, which is typically denoted as \( \alpha \). Hence, P corresponds to the cutting angle (1).
2. Angle Q (β): This angle is formed between the surface of the rock and the edge of the cutting tool. This is referred to as the rake angle, denoted by \( \gamma \). Hence, Q corresponds to the rake angle (4).
3. Angle R (δ): This angle is the angle formed between the cutting edge and the surface of the tool, often known as the wedge angle. Thus, R corresponds to the wedge angle (3).
4. Angle S (γ): This angle is the clearance between the cutting tool and the material being cut, known as the clearance angle. Therefore, S corresponds to the clearance angle (2).
Hence, the correct match is P-2, Q-4, R-1, S-3.