PATTERN MAKING

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• Q1: Define Pattern.
  Ans: A pattern is a model or replica of the final object used to make a mould for casting.
• Q2: Define Pattern Making.
  Ans: Pattern making is the process of designing and producing patterns used in casting.
• Q3: State the principle of Pattern Making.
  Ans: The principles of pattern making are:

  • ➔ Provide proper allowances
  • ➔ Ensure easy removal from mould
  • ➔ Maintain correct dimensions
  • ➔ Provide smooth surface finish
• Q4: State any four properties of Pattern Material.
  Ans: The properties are:

  • ➔ Light in weight
  • ➔ Strong and durable
  • ➔ Easy to shape
  • ➔ Resistant to wear and moisture
• Q5: Name the materials used for Pattern Making.
  Ans: The materials are:

  • ➔ Wood
  • ➔ Metal
  • ➔ Plastic
  • ➔ Wax
• Q6: What is Mahogany?
  Ans: Mahogany is a type of hardwood commonly used in pattern making due to its strength and smooth finish.
• Q7: State the merits of Wooden Pattern Making.
  Ans: The merits are:

  • ➔ Low cost
  • ➔ Easy to shape and handle
  • ➔ Light in weight
  • ➔ Easily available
• Q8: State the drawbacks of Wooden Pattern Making.
  Ans: The drawbacks are:

  • ➔ Less durable
  • ➔ Absorbs moisture
  • ➔ Can warp or crack
  • ➔ Not suitable for mass production
• Q9: What is Metallic Pattern?
  Ans: A metallic pattern is a pattern made from metals like aluminium or steel for long-lasting use.
• Q10: State the advantages of Metallic Pattern Making.
  Ans: The advantages are:

  • ➔ High durability
  • ➔ Accurate dimensions
  • ➔ Smooth surface finish
  • ➔ Suitable for mass production
• Q11: State the disadvantages of Metallic Pattern Making.
  Ans: The disadvantages are:

  • ➔ High cost
  • ➔ Heavy weight
  • ➔ Difficult to modify
  • ➔ Requires skilled labour
• Q12: What is a Plastic Pattern?
  Ans: A plastic pattern is a pattern made from plastic materials, offering good finish and moderate strength.
• Q13: State the advantages of Plastic Pattern Making.
  Ans: The advantages are:

  • ➔ Light weight
  • ➔ Good surface finish
  • ➔ Resistant to moisture
  • ➔ Easy to shape
• Q14: State the disadvantages of Plastic Pattern Making.
  Ans: The disadvantages are:

  • ➔ Lower strength than metal
  • ➔ Can deform at high temperature
  • ➔ Limited life
  • ➔ Not suitable for heavy work
• Q15: What is Master Pattern?
  Ans: A master pattern is the original pattern used to create other patterns or moulds.
• Q16: State the techniques of Pattern Making.
  Ans: The techniques are:

  • ➔ Hand pattern making
  • ➔ Machine pattern making
  • ➔ CNC machining
  • ➔ Rapid prototyping
• Q17: Briefly discuss the construction of Pattern.
  Ans: Pattern construction involves selecting suitable material, providing allowances, shaping, finishing, and assembling parts to form the final pattern.
• Q18: How is a pattern preserved?
  Ans: Patterns are preserved by applying protective coatings, storing in dry places, and handling carefully to avoid damage.
• Q19: State some modern trends in Pattern Making.
  Ans: The modern trends are:

  • ➔ CNC machining
  • ➔ 3D printing
  • ➔ CAD/CAM design
  • ➔ Rapid prototyping
• Q20: What is a CNC Router Machine?
  Ans: A CNC router machine is a computer-controlled machine used to cut and shape materials automatically.
• Q21: Briefly discuss the working of CNC Router Machine.
  Ans: The CNC router works by following programmed instructions (G-code) to cut material precisely using rotating tools.
  It performs operations automatically with high accuracy.
• Q22: State any four advantages of CNC Router Machine.
  Ans: The advantages are:

  • ➔ High accuracy
  • ➔ Fast production
  • ➔ Less human error
  • ➔ Repeatability
• Q23: State the uses of CNC Router Machine.
  Ans: The uses are:

  • ➔ Pattern making
  • ➔ Wood cutting
  • ➔ Engraving
  • ➔ Metal shaping
• Q24: What is a Rapid Prototyping Machine?
  Ans: A rapid prototyping machine is used to quickly create models or prototypes using computer design data.
• Q25: Briefly discuss the working of Rapid Prototyping Machine.
  Ans: It works by building objects layer by layer using materials like plastic based on 3D design data.
• Q26: State any four advantages of Rapid Prototyping Machine.
  Ans: The advantages are:

  • ➔ Fast production
  • ➔ High accuracy
  • ➔ Easy design changes
  • ➔ Reduced cost
• Q27: State the uses of Rapid Prototyping Machine.
  Ans: The uses are:

  • ➔ Product design
  • ➔ Model making
  • ➔ Testing prototypes
  • ➔ Industrial applications
• Q28: What is a Stereo Lithography Machine?
  Ans: A stereolithography machine is a type of 3D printer that uses light to cure liquid resin into solid objects.
• Q29: Briefly discuss the working of Stereo Lithography Machine.
  Ans: It works by using a laser beam to harden liquid resin layer by layer to form a solid object.
• Q30: State any four advantages of Stereo Lithography Machine.
  Ans: The advantages are:

  • ➔ High precision
  • ➔ Smooth surface finish
  • ➔ Complex shapes possible
  • ➔ Fast prototyping
• Q31: State the uses of Stereo Lithography Machine.
  Ans: The uses are:

  • ➔ Medical models
  • ➔ Product design
  • ➔ Engineering prototypes
  • ➔ Casting patterns
• Q32: What is Sintering?
  Ans: Sintering is a process of heating powdered material below its melting point to form a solid mass.
• Q33: What is a Selective Laser Sintering Machine?
  Ans: A selective laser sintering machine is a 3D printing machine that uses a laser to fuse powdered material into solid parts.
• Q34: Briefly discuss the working of Selective Laser Sintering Machine.
  Ans: It works by spreading a thin layer of powder and using a laser to fuse selected areas layer by layer to build an object.
• Q35: State any four advantages of Selective Laser Sintering Machine.
  Ans: The advantages are:

  • ➔ No need for support structures
  • ➔ Complex shapes possible
  • ➔ Strong parts
  • ➔ Efficient material use
• Q36: State the uses of Selective Laser Sintering Machine.
  Ans: The uses are:

  • ➔ Industrial prototypes
  • ➔ Functional parts
  • ➔ Aerospace components
  • ➔ Automotive parts