Quiz About Iron and Steel Manufacturing!

The roughness value is expressed in micrometers. Micrometer is a unit of measurement that is equal to one millionth of a meter. It is commonly used to measure small distances or dimensions, such as the roughness of a surface.

The type of angle plate referred to in this question is a "Box" angle plate. Angle plates are used in machining operations to hold workpieces at a specific angle. A box angle plate is a type of angle plate that has a rectangular box-like shape, with two perpendicular surfaces that can be used for holding and clamping workpieces.

Cast iron is commonly used to make angle plates because it is a strong and durable material. It has excellent heat resistance and can withstand high temperatures without warping or deforming. Cast iron also has good vibration damping properties, which makes it ideal for use in machine tool applications. Additionally, it is relatively easy to machine and has good wear resistance, making it suitable for use in repetitive and heavy-duty operations.

The length of the tool traveled in one revolution is equal to the circumference of the circle formed by the tool. The formula for the circumference of a circle is given by 2πr, where r is the radius of the circle. In this case, the diameter of the circle is given as 'D', so the radius would be D/2. Therefore, the correct answer is pi x D, as it represents the circumference of the circle.

The angle between the two faces of an angle plate is 90°. This is because an angle plate is a tool used in machining to hold workpieces at a right angle (90°) to each other. The two faces of the angle plate are designed to be perpendicular to each other, forming a right angle. This allows for precise and accurate machining operations that require perpendicularity.

Cast iron is the correct answer because it is a commonly used material for manufacturing marking tables. Cast iron has excellent stability and rigidity, making it suitable for heavy-duty applications. It has a high resistance to wear, ensuring the durability of the marking table. Additionally, cast iron has good vibration damping properties, which helps in achieving accurate and precise markings.

The operation being described in this question is checking for parallelism. This involves comparing the alignment of two or more lines or surfaces to determine if they are parallel to each other. It is a common measurement used in various fields such as engineering and construction to ensure proper alignment and accuracy in structures and components.

The roughness grade numbers used range from N1 to N12.

The letter 'a' denotes roughness values. Roughness values refer to the irregularities or deviations in the surface texture of an object. These irregularities can be measured and quantified using various methods, such as Ra (average roughness) or Rz (mean roughness depth). The roughness values provide information about the quality and smoothness of a surface, which is important in many industries, including manufacturing, engineering, and automotive.

The term marked as 'x' refers to the Diameter over roller at the bigger end.

The part marked as 'x' is called an angle plate. An angle plate is a workholding device used in machining operations to hold workpieces at a right angle to the machining surface. It is typically made of cast iron and has precision-ground surfaces to ensure accurate positioning of the workpiece. Angle plates are commonly used in milling, drilling, and grinding operations to provide stability and support to the workpiece.

The device marked as 'X' is a four jaw chuck. A four jaw chuck is a type of chuck used in machining operations to hold and secure a workpiece. It consists of four independently adjustable jaws that can be moved to grip the workpiece securely. This allows for precise and flexible clamping of various sizes and shapes of workpieces.

Lapping is a precision finishing operation that involves rubbing two surfaces together with an abrasive material in between. This process helps to achieve a high level of flatness, smoothness, and accuracy on the surfaces being worked on. It is commonly used in the manufacturing industry to improve the surface finish of parts, such as bearings, valves, and sealing surfaces. Lapping can remove small amounts of material and create a precise fit between two mating surfaces, ensuring optimal performance and functionality.

The roughness value of grade No N1 is 0.025 microns.

The type of angle plate referred to in the question is a plain angle plate. A plain angle plate is a flat metal plate with a right-angle shape, typically used in machining and tooling applications. It does not have any slots or holes, making it suitable for general purpose work where a flat surface is needed for setup or measurement purposes.

Cast iron is the correct answer because it is a lapping material that is known for its ability to hold and distribute abrasive particles evenly. It has a porous structure which allows for easy charging, meaning that it can absorb and retain the abrasive particles effectively. Additionally, cast iron is also known for its rapid cutting ability, making it an ideal choice for lapping applications where quick material removal is desired. Copper and brass, close grained iron, and white cast iron may also be used as lapping materials, but they do not possess the same characteristics of easy charging and rapid cutting as cast iron.

Grade 1 angle plates are more accurate and commonly used for tool room work. These angle plates are manufactured with high precision and have tighter tolerances compared to lower grade angle plates. They are designed to provide a reliable and stable reference surface for various machining operations in tool rooms. The high accuracy of Grade 1 angle plates ensures precise and consistent measurements, making them ideal for precision work where accuracy is crucial.

The cutting speed is expressed in meters per minute. This unit of measurement is commonly used in machining operations to indicate how fast the cutting tool is moving across the workpiece. By expressing the cutting speed in meters per minute, it allows for easy comparison and calculation of machining parameters such as feed rate and spindle speed.

The surface roughness symbol marked as 'X' represents the machining allowance. Machining allowance refers to the additional material intentionally left on the surface during the machining process. It allows for subsequent finishing operations or adjustments to be made to achieve the desired final dimensions and surface finish.

The tool post is the correct answer because it is the part of the lathe that holds the cutting tool. In this case, it would also be used to mount the dial indicator for truing the bore. The tool post allows for precise positioning and adjustment of the tool, making it the suitable choice for mounting the dial indicator in order to accurately measure and correct any deviations in the bore.

The roughness grade number for symbol N1 to N3 represents a surface roughness that is relatively smooth. This means that the surface has minimal imperfections and is considered to have a fine finish. The N1 to N3 range indicates that the roughness grade number falls within the lower end of the scale, suggesting a smoother surface compared to higher grade numbers.

The recommended cutting speed for turning mild steel using H.S.S tool is 35-50 m/min. This range ensures efficient cutting while minimizing tool wear and heat generation. Cutting speeds below 35 m/min may result in poor surface finish and increased tool wear, while speeds above 50 m/min may cause excessive heat and reduce tool life. Therefore, the optimal range for cutting mild steel with an H.S.S tool is 35-50 m/min.

The roughness grade number for symbol is N7 to N9. This means that the surface roughness of the symbol falls within the range of N7 to N9, indicating a moderate level of roughness.

A face plate is a work holding device used in a lathe where irregularly shaped workpieces can be securely held. It is a flat circular plate that is attached to the spindle of the lathe. The workpiece is bolted or clamped onto the face plate, allowing it to be rotated and machined accurately. The face plate provides a large surface area for gripping the workpiece, making it suitable for holding irregularly shaped or large workpieces that cannot be held by other types of chucks or fixtures.

The value of "b" in the surface roughness symbol represents the production method. This means that it indicates the process or technique used to create the surface finish of a material. It can vary depending on factors such as the type of material, the desired finish, and the manufacturing capabilities. The production method can have a significant impact on the final surface roughness of a material, affecting its texture, appearance, and functional properties.