Shaping Materials Class 9 Notes Kaushal Vikas Chapter 5

Include Kaushal Vikas Class 9 Solutions and Class 9 Vocational Education Chapter 5 Shaping Materials Notes in your preparation plan to revise efficiently.

Class 9 Kaushal Vikas Chapter 5 Notes

Introduction

• India has a long history of shaping materials and shaping them as per need. During the Sindhu-Sarasvati
  civilisation where houses were built from uniform bricks of the same size with moulding wet clay and firing it in large kilns to achieve hardness and durability required for buildings.
• In earlier times, carpenters, blacksmiths, weavers, potters, jewellers, etc. shape materials using skills passed from generation to generation.
• Industrialisation led to the replacement of manual tools with electric power tools, improving the speed, efficiency, and quality of production.
• Traditional jobs changed, but skills like measurement, design, safety, and quality testing remained important.

Achievements in Ancient Indian Metallurgy and Architecture

• Intricate copper and brass objects like the famous ‘Dancing Girl’ were created using process of casting.
• The famous Iron Pillar at the Qutub Minar complex in Delhi, made in the 4th century has not rusted showing advanced knowledge of iron purification.
• Temples like Kailasha (Ellora), Konarka (Puri), Brihadishvara (Thanjavur) show in architecture and engineering.

Value Addition
Value addition is the process in which raw materials are transformed into useful products, increasing their value, for example a stone has low value but becomes more valuable when shaped into a statue.

Figure: Value chain of cotton

• The manufacturing sector contributes about 17-18% to India’s Gross Value Added (Ministry of Statistics and Programme Implementation, National Accounts Statistics 2025).
• The manufacturing sector remains an important source of employment in India.

Value Addition in Kitchen Utensil

• Metal scrap, which has relatively low value (approximately ₹ 20/kg), is transformed into high-value kitchen utensils (approximately ₹ 1200) through processing.
• The scrap metal is first melted and then moulded into the desired shape of the utensil. It is polished or coated to improve quality and prevent sticking. Wooden handles are added for easy handling, and the base is made suitable for both stove and induction use, increasing its value and usefulness.

Processing Material – Transformation to a Product
Different manufacturing processes shape raw materials into useful products. These processes have evolved over thousands of years and become more and more specialised. However, some processes are common across a range of materials. For example, fabric, cloth, leather, metals and plastics.

Transformation of Some Materials into a Product
Fabric

• Step 1: A design is made by drawing the pattern using a pencil.
• Step 2: The pattern is marked on the fabric with chalk.
• Step 3: The fabric is cut into shape using scissors.
• Step 4: The pieces are joined using a needle and thread or a sewing machine.
• Step 5: The product is finished by ironing and trimming.

Wood

• Step 1: The product design is drawn on paper.
• Step 2: Cutting and drilling points are marked on the wood.
• Step 3: The wood is cut using a saw while holding it with a vise.
• Step 4: Parts are joined using adhesive or a hammer and nails.
• Step 5: The surface is finished by sanding, polishing, and painting.

Metal

• Step 1: A technical drawing or CAD design is prepared.
• Step 2: Markings are made using an engraving tool.
• Step 3: The metal is cut and shaped using cutting or power tools.
• Step 4: The parts are joined using bolts, rivets, welding, or soldering.
• Step 5: The product is finished using a grinder and paint.

Plumbing

• Step 1: A layout diagram of the piping system is prepared.
• Step 2: Cutting and joining points are marked on the pipes.
• Step 3: Pipes are cut using a PVC cutter or hacksaw.
• Step 4: The pipes are joined using brazing, coupling, or adhesives.
• Step 5: The system is checked for leakage and joints are tightened.

Construction

• Step 1: The design and estimation of the project are prepared.
• Step 2: Measurements are taken and markings are done.
• Step 3: Materials are cut and shaped as required.
• Step 4: The parts are joined and assembled properly.
• Step 5: Finishing works like polishing, painting, and inspection are done.

Glass is made by heating sand at very high temperatures until it melts and becomes solid again.

Obsidian is a natural glass formed from volcanic lava and is extremely sharp. A blade made from obsidian can be 500 times sharper than surgeon steel scalpel.

Artificial spider silk is a strong and

• lightweight material made by scientists using bacteria.
• Natural rubber is obtained from the latex of rubber trees and is widely used in daily life.

Safety Rules While Processing Material

• The work area is organised properly and all safety protocols are followed during the process.
• Adhesives and fasteners are handled carefully, while the working area is kept clean.
• Measurements are taken accurately without damaging the material.

Choosing Material for a Specific Product
Selection of Material Based on Characteristics

• The characteristics of a material decide whether it is suitable for a particular use. For example, steel and aluminium are used for kitchen utensils because they can tolerate high heat, while plastic melts when heated and is unsafe.
• A sturdy stool needs a material like wood or metal that can hold weight, while a reusable bag needs something flexible and light like jute.
• Environmental and weather conditions also play a role. For example, bathroom shelves are often made from steel, PVC or aluminium because they resist moisture.
• A single material can serve different purposes depending on how it is used. For example, clay when soft can be moulded for craft work; when fired, it becomes durable pots and bricks.

Following Safety Protocol
Before beginning any work, read available manuals or instruction guides and consult your teacher or experts to understand the safety precautions that need to be taken. Following safety protocols prevents accidents and ensures safe working conditions in all activities.

Safety Signage

• Safety signage refers to visual indicators that use standardised colours, symbols and text.
• It is used to communicate potential hazards, required actions, the location of safety equipment and emergency procedures in workplaces and public areas.
• The purpose of safety signs is to prevent accidents and injuries by providing clear and easy to understand information.

Safety Signage Colours

Colour	Meaning	Example
Red	Fire, Prohibition	Fire extinguisher, stop buttons
Yellow	Warning and physical hazards	Wet floor, construction site
Blue	Mandatory actions	Wear helmet, machine safety instructions
Green	Guidance / Safe condition	Emergency exit, assembly point

Common Safety Symbols

Taking Measurements

• Measurement is one of the most important and basic skills required for working with materials.
• It is used to estimate the exact amount of material required for making a product.
• It helps in reducing wastage of material during production.
• It also reduces cost and ensures that the product meets required dimensions and quality standards.
• The smallest value that can be measured accurately by an instrument is called its least count.
• Tolerance is the permissible amount of error in a measurement.
• The selection of a measuring instrument depends on the level of accuracy required. For example, a metre scale has a least count of 1 mm, while a vernier callipers has a least count of 0.02 mm and is more precise.
• A surveyor’s tape is used for measuring land, while a metre tape is used for measuring cloth.

Measuring Tools and their Use

Quality in Measurement

• Accurate measurement of materials is necessary to ensure quality work.
• Errors in measurement should be reduced for better accuracy.
• The measuring instrument should be selected based on its least count.
• Instruments should be handled carefully to maintain accuracy.
• Proper precautions should be taken according to the material and purpose of measurement.

Making Technical Drawings

• Technical drawings provide precise information such as dimensions and material specifications of different parts.
• Technical drawings are used in construction sites, garment designing and product fabrication to convey exact visual information.
• They help in clear communication among designers, engineers and fabricators. They ensure identical production of items without variations. For example, dining chairs in a set are made with the same dimensions and shape.

Technical Drawing Symbols

• Technical drawing is the language used by technicians. It follows specific rules and conventions, similar to any other language. These rules are represented using drawing symbols.
• Common symbols are used to represent different components and processes in technical drawings such as symbols used in electric circuits represent components like battery, switch and bulb.
• Technical drawing symbols help in clearly communicating ideas in a simple visual form. People working with machines and materials must learn these symbols to understand and create technical drawings.

Figure: Commonly used lines and symbols in technical drawing

Drawing an Object

• Technical drawings represent the exact shape, size and proportion of an object.
• The complete dimensions of an object are understood by viewing it from different angles. A single view does not show all dimensions of an object clearly. Multiple views such as front view, top view and side view are needed to understand the full shape and size.
• A combination of different views provides a complete representation of the object.

Projection in Drawing
Projection is the technique of representing a three-dimensional (3D) object on a two-dimensional (2D) surface using different views. The following figure shows an example of projection of different objects.

Figure: Projection of Different Objects

Types of Views in Construction Drawing

• Plan (Top View): Shows the layout of a building from above, including rooms, walls, and spaces.
• Elevation (Front/Side View): Shows the external appearance of a building from the front or sides.

The following figure shows an example of a plan and elevation in construction drawing.

Figure: Technical Drawing in Construction

Types of Technical Drawings

• Circuit Diagrams: Used to represent electrical circuits and connections.
• Plumbing Diagrams: Show the layout of pipes, fittings, and water systems.
• Patterns used in designing clothes, showing the outline and shape of garments.

The following figure shows examples of different types of technical drawings.

Figure: Technical drawings of electric circuits, plumbing systems and dress pattern

Scale of Drawing

• A scale is used to reduce or enlarge the dimensions of an object proportionally on paper.
• Scale represents the relationship between drawing size and actual size in the form 1:XX. It means 1 unit on the drawing corresponds to XX units in real life.
• Scale helps in maintaining correct proportions of the object in the drawing. While reading a drawing, the scale must be referred to for accurate understanding. The scale is usually mentioned at the bottom of the drawing in the title box.
• The concept of scale can be better understood through the following examples of converting actual dimensions into drawing dimensions.

Some Examples of Converting Actual Dimensions into Drawing Dimensions

Actual Dimension of object	Scale	Dimensions on the Technical Drawing
Height of a shop	1:100	6 m in actual = 6 cm on drawing
Length of field on ground	1:1000	400 m in actual = 40 cm on drawing
Height of water bottle	1:10	20 cm in actual = 2 cm on drawing

Technology and Artificial Intelligence in Shaping Materials

• Manufacturing work has evolved from manual skills to the use of machines and power tools, increasing speed and efficiency.
• Automation, including Computerised Numerical Control (CNC) machines and robots, replaces repetitive tasks and ensures higher accuracy and precision.
• Modern technology enables large-scale production with improved efficiency and consistency.

Points to be kept in Mind while Working with Materials

• Select materials and manufacturing processes based on the properties of materials and the required product.
• Use technical drawings for proper design and clear communication during production.
• Choose appropriate measuring tools according to the measurement needed and required accuracy.
• Follow safety precautions carefully based on the type of work being done.
• Use safety signs and symbols to identify risks and ensure necessary precautions.
• Keep the workplace clean and well-organised to prevent accidents.

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