Define pattern colour code, Mechanical Engineering

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Q. Define pattern colour code?

The patterns are normally painted with contrasting colours such that the mould maker would be able to understand the functions clearly. The colour code used is

  • Red or orange on surfaces not to be finished and left as cast
  • Yellow on surfaces to be machined.
  • Black on core prints for unmachined openings.
  • Yellow stripes on black on core prints for machined openings.
  • 5 Green on seats of and for loose pieces and loose core prints.
  • Diagonal black stripes with clear varnish on to strengthen the weak patterns or to shorten a casting.

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