Can you explain pattern allowances, Mechanical Engineering

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Q. Can you explain Pattern Allowances?

The difference in the dimensions of the casting and the patterns is due to the various allowances considered while designing a pattern for casting:

  • Shrinkage allowance
  • Machining allowance
  • Pattern draft or taper
  • Corners and fillets
  • Rapping or shake allowance
  • Distortion allowance

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