Q1: Define a Grinder.
Ans: A grinder is a machine tool used to remove small amounts of material from a workpiece by using an abrasive rotating wheel for finishing the surface.
Q2: What is a Grinding Machine?
Ans: A grinding machine is a power-operated machine that uses a rotating grinding wheel to cut, shape, or finish metal and other materials with high accuracy.
Q3: State the parts of a Grinding Machine.
Ans: The main parts of a grinding machine are:
- ➔ Base
- ➔ Table
- ➔ Wheel Head
- ➔ Grinding Wheel
- ➔ Work Holding Device
- ➔ Motor
Q4: State four uses of Grinding Machine.
Ans: Uses of grinding machine are:
- ➔ To finish surfaces
- ➔ To sharpen cutting tools
- ➔ To remove small amounts of material
- ➔ To produce accurate dimensions
Q5: What is a Utility Grinder?
Ans: A utility grinder is a general-purpose grinding machine used for performing different types of grinding operations such as sharpening and finishing.
Q6: State the types of Utility Grinder.
Ans: Types of utility grinders are:
- ➔ Bench Grinder
- ➔ Pedestal Grinder
- ➔ Portable Grinder
- ➔ Wet Grinder
Q7: Briefly explain the Bench Grinder.
Ans: A bench grinder is a small grinding machine mounted on a workbench. It is used for light grinding, sharpening tools, and finishing small jobs.
Q8: Briefly explain the Pedestal Grinder.
Ans: A pedestal grinder is a heavy-duty grinding machine mounted on a stand (pedestal). It is used for heavy grinding work and larger tools.
Q9: Briefly explain the Portable Grinder.
Ans: A portable grinder is a handheld grinding machine that can be carried easily. It is used for grinding at different locations and for repair work.
Q10: Briefly explain the Wet Grinder.
Ans: A wet grinder is a grinding machine that uses water or coolant during grinding. It helps to reduce heat and improves the surface finish.
Q11: What are Grinding Wheels?
Ans: Grinding wheels are circular tools made of abrasive grains bonded together, used in grinding machines to cut, shape, or finish materials.
Q12: What is a Binding Material? Name some.
Ans: Binding material is the substance that holds the abrasive grains together in a grinding wheel.
Examples are:
- ➔ Clay
- ➔ Resinoid
- ➔ Rubber
- ➔ Shellac
Q13: Define Grade.
Ans: The force that connects or joins abrasive grains is called grade.
Q14: Define Abrasive Grains.
Ans: Abrasive grains are small, hard particles used in grinding wheels to remove material from the surface of a workpiece.
Q15: Name the types of Abrasives.
Ans: Types of abrasives are:
- ➔ Natural Abrasives
- ➔ Artificial Abrasives
Q16: What are Natural Abrasives? Name some.
Ans: Natural abrasives are obtained from nature.
Examples are:
Q17: What are Artificial Abrasives? Name some.
Ans: Artificial abrasives are made by humans in factories.
Examples are:
- ➔ Silicon Carbide
- ➔ Aluminium Oxide
Q18: Define Resinoid Bonds.
Ans: Resinoid bonds are made from synthetic resins and provide high strength and flexibility to the grinding wheel.
Q19: Define Rubber Bonds.
Ans: Rubber bonds use rubber as a bonding material and provide smooth finish and flexibility.
Q20: Define Shellac Bonds.
Ans: Shellac bonds use shellac as a bonding material and are used for fine finishing work.
Q21: Define Silicate Bonds.
Ans: Silicate bonds use silicate material and are used where low heat generation is required.
Q22: Define Vitrified Bonds.
Ans: Vitrified bonds are made from clay and ceramic materials and are strong, rigid, and commonly used in grinding wheels.
Q23: State the selection criteria of the Grinding Wheel.
Ans: Selection of grinding wheel depends on:
- ➔ Type of material
- ➔ Type of grinding work
- ➔ Wheel speed
- ➔ Surface finish required
- ➔ Type of machine
Q24: What is the Grain Structure in a Grinding Wheel?
Ans: Grain structure refers to the spacing between abrasive grains in a grinding wheel. It may be dense or open depending on the requirement.
Q25: State the types of Grinding Wheels.
Ans: Types of grinding wheels are:
- ➔ Straight Wheel
- ➔ Cylindrical Wheel
- ➔ Saucer Wheel
- ➔ Dish Wheel
- ➔ Tapered Wheel
- ➔ Straight Cup Wheel
Q26: What is a Straight Type Wheel?
Ans: A straight wheel is a common grinding wheel with a flat surface used for general grinding purposes.
Q27: What is a Cylindrical Type Wheel?
Ans: A cylindrical wheel is used for surface grinding and has a large contact area with the workpiece.
Q28: What is a Saucer Type Wheel?
Ans: A saucer wheel is shaped like a saucer and is mainly used for sharpening cutting tools.
Q29: What is a Dish Type Wheel?
Ans: A dish wheel has a concave shape and is used for tool and cutter grinding.
Q30: What is a Tapered Type Wheel?
Ans: A tapered wheel has a tapered shape and is used for special grinding operations.
Q31: What is a Straight Cup Type Wheel?
Ans: A straight cup wheel is cup-shaped and is used for surface grinding and tool sharpening.
Q32: State the safety precautions for Grinding.
Ans: Safety precautions are:
- ➔ Wear safety goggles
- ➔ Check the grinding wheel before use
- ➔ Do not use damaged wheels
- ➔ Keep proper distance from wheel
- ➔ Use proper guards
- ➔ Avoid loose clothing
