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Draft is generally provided to make a clearance between the pattern and the mould during pattern extraction.

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in Casting-Forming-Welding I by (687k points)
Draft is generally provided to make a clearance between the pattern and the mould during pattern extraction.

(a) True

(b) False

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This interesting question is from Pattern Fillets topic in section Pattern and Pattern Making of Casting-Forming-Welding I

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The correct option is (a) True

The best explanation: Draft angles are normally included into the pattern design to make easy extraction of a pattern from the mould cavity. Draft angles are used in most of the pro¬cesses in which a pattern is withdrawn from the mould prior to pouring. Draft is very necessary to provide a clearance between the pattern and the mould during pattern extraction.

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