Question

Colour code for part to be machined for wooden patterns is represented by following colour :   
1. Red or orange
2. Yellow
3. Black on core prints
4. Green

Answer 1

Correct Answer - Option 1 : Red or orange

Explanation:
Pattern:

• Pattern is the replica of final casting to be produced with some modification. 
• Modification are done in the form of allowances.

Pattern Colour Code:

The pattern are normally painted with contrasting colors such that the mould maker would be able to understand the functions clearly.

The colour code used is as follows:

Colour	Meaning
Yellow	Core prints and seats for loose core prints are indicated by yellow colour on the pattern
Red	The pattern surface is painted with red colour on all surfaces which are required to be machined
Black	Core-prints on unmachined openings.
Yellow strips on black	Core print for machined openings.
Green	Loose pieces and loose core-prints.
Black strips diagonal	Strengthen the weak pattern or shorten a casting.