Explain the importance of pattern allowances and state various pattern allowances.

Explain the importance of pattern allowances and state various pattern allowances. 
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Answer :

Pattern Allowances are Important Because: 1. Solid contraction can be reduced by providing more allowance on patterns. 2. When a pattern is drawn from a mould, there is always some possibility of injuring the edges of the mould. 3. Rough surfaces of castings that have to be machined are made to dimensions somewhat over those indicated on the finished working drawings. 4. Some castings, because of their size, shape and type of metal, tend to warp or distort during the cooling period.

Various Pattern Allowances are: i. Shrinkage allowance ii. Draft allowance iii. Machining allowance iv. Distortion or camber allowance v. Shake allowance / rapping allowance
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