State importance of colour scheme for pattern. Illustrate a common colour scheme.

State importance of colour scheme for pattern. Illustrate a common colour scheme.
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Answer :

Importance of Color coding used for pattern

- Identify the core prints, loose pieces etc.

- Identify quickly the main body of the pattern and different parts of the pattern to form the main body of a casting.

- Identify the surfaces to be machined or not to be machined.

- Indicate the type of metal to be cast.

The following color coding is generally used in Pattern making

RED:- Surfaces to be machined

BLACK:- Surfaces to be left unmachined.

Yellow:- Core Prints

Red strips on yellow base:- Seats for loose pieces

Black strips on yellow base:- Stop offs

Clear or No colour:- Parting surface
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