Author Topic: CORRECT: 2024 NABTEB METAL WORK ANSWERS ( OBJ & ESSAY) (Read 6609 times)

MANDINHO · « **on:** July 30, 2024, 02:21:29 pm »

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MANDINHO · « **Reply #1 on:** July 31, 2024, 03:52:19 pm »

NABTEB 2024 METAL WORK OBJ & ESSAY ANSWERS

===========================

METAL WORK OBJ
01-10: BDCADDDCCD
11-20: CACCBBDDCA
21-30: ADDACBCCCD
31-40: CBCDACBBBA

COMPLETED
===========================

ANSWER FIVE QUESTIONS ONLY`

(1ai)
Scriber:
(i) Wear Safety Glasses: Always wear safety glasses to protect your eyes from metal shards or other debris that may fly off during scribing.
(ii) Use with Controlled Force: Apply only the necessary force when using the scriber to avoid slipping and injuring yourself or damaging the workpiece.

(1aii)
Try Square:
(i) Check for Sharp Edges: Ensure the edges of the try square are smooth and free from burrs to prevent accidental cuts or injuries.
(ii) Secure Workpiece Properly: Always secure the workpiece firmly before using the try square to prevent it from slipping, which could lead to inaccurate cuts or accidents.

(1aiii)
File:
(i) Use a Handle: Always use a file with a proper handle to maintain control and prevent slipping, which could cause injury.
(ii) File Away from Your Body: File in a direction away from your body to prevent accidental contact between the file and your body, especially your hands.

(1aiv)
Chisel:
(i) Keep Hands Clear: Always keep your hands behind the cutting edge of the chisel to avoid accidental slips or cuts.
(ii) Use a Mallet or Hammer: Never strike a chisel with your hand; always use a mallet or hammer designed for striking tools to avoid injury and ensure controlled force.

(1bi)
Ferrous Metal: Ferrous metals are metals that contain iron. These metals are known for their strength and durability, making them suitable for construction and heavy-duty applications. Ferrous metals include steel, cast iron, and wrought iron.

(1bii)
Non-Ferrous Metal: Non-ferrous metals are metals that do not contain iron. These metals are generally more resistant to rust and corrosion compared to ferrous metals and are often used in applications where these properties are crucial. Non-ferrous metals include aluminum, copper, brass, zinc, and lead.

(1c)
Ferrous Metals:
(i) High carbon steel
(ii) Mild steel
(iii) Pig iron

Non-Ferrous Metals:
(i) Bronze
(ii) Brass
===========================

(2a)
(i) Headstock
(ii) Tailstock
(iii) Carriage
(iv) Tool post

(2aii)
(i) Headstock: Houses the spindle and gears and provides power and speed to the lathe.
(ii) Tailstock: Supports the workpiece and allows for the use of live centers and drills.
(iii) Carriage: Moves along the bed and supports the tool post; controls the cutting tool's position.
(iv) Tool post: Holds and secures the cutting tools in place during machining.

(2b)
(i) Clearance Fit: A clearance fit is a type of fit where there is always a gap between the mating parts, ensuring that the parts can move freely. This fit is used when ease of assembly and disassembly is required, such as in shaft and hole assemblies where movement is necessary.

(ii) Transition Fit: A transition fit is a type of fit where the parts may either have a slight clearance or a slight interference, providing a compromise between easy assembly and a tight fit. This type of fit is used when precision is required, and the parts should neither be too loose nor too tight.

(iii) Interference Fit: An interference fit is a type of fit where the mating parts are designed to have a slight overlap, resulting in a tight and secure assembly. This fit is used when parts need to be permanently fixed together or when a strong, tight joint is required, such as in press-fitted bearings.
===========================

(3ai)
(Draw the diagram)

Upsetting: It is the process of increasing the cross-section at the expense of the length of the workpiece.

(3aii)
(Draw the diagram)

Drawing down: It is the reverse of the upsetting process. In this process, the length is increased, and the cross-sectional area is reduced.

(3aiii)
(Draw the diagram)

Bending: It is the act of turning or bending a piece of metal in a round or angular shape.

(3b)
(Draw the diagram)

===========================

(5a)
Drilling is a machining process that involves cutting or enlarging a hole in a solid material using a drill bit. The drill bit is rotated while pressure is applied to the material to create the hole.

(5b)
Benchwork refers to work activities that are performed on a workbench or a sturdy table, involving manual tasks like assembling, shaping, or finishing small components, While a workbench is a sturdy table or surface specifically designed for various tasks such as woodworking, metalworking, electronics assembly, or other crafting activities. It serves as a stable platform for working on projects.

(5c)
(Draw the diagram)

===========================

(6a)
(Draw the diagram)

(6b)
Given:
Spindle speed (N) = 200rev/min
Diameter of the workpiece (D) = 80mm
Cutting Speed (V) = π x D x N
Converting the diameter to meters:
D = 80mm = 0.08m
V = π x 0.08 x200
V = 3.1416 x 0.08 x 200
V = 50.2656m/min

(6c)
UPSETTING:
(i) It involves increasing the cross-sectional area of the material.
(ii) It is achieved by compressing the material along its axis.
(iii) The length of the workpiece decreases as the diameter increases.

DRAWING DOWN:
(i) It involves decreasing the cross-sectional area of the material.
(ii) It is achieved by elongating the material along its axis.
(iii) The length of the workpiece increases as the diameter decreases.
===========================

(7a)
(i) Vernier caliper
(ii) Micrometer
(iii) Steel rule
(iv) Dial indicator

(7b)
(i) Handle the tools with care to avoid dropping or damaging them.
(ii) Keep the tools clean and free from oil or debris to ensure accurate measurements.
(iii) Store the tools properly in their cases when not in use to prevent damage and maintain their precision.

(7c)
(Draw the diagram)

===========================

COMPLETED

Earlyface

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Author Topic: CORRECT: 2024 NABTEB METAL WORK ANSWERS ( OBJ & ESSAY) (Read 6609 times)

MANDINHO

CORRECT: 2024 NABTEB METAL WORK ANSWERS ( OBJ & ESSAY)

MANDINHO

Re: CORRECT: 2024 NABTEB METAL WORK ANSWERS ( OBJ & ESSAY)

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