In order to facilitate the withdrawal
of pattern :
Pattern is made smooth
Water is applied on pattern surface
Allowances are made on pattern
Draft is provided on pattern
Draft is provided on pattern
●In order to facilitate the withdrawal
of pattern, draft is provided on pattern.
●At the time of withdrawing the
pattern from the sand mould, the vertical faces of the pattern are in continuous
contact with the mould wall which may damage the mould cavity. To avoid this,
the vertical faces are always tapered from the parting plane.
Hence, the correct option is (D).
&Key Points:-
1. This allowance ranges from
2. Draft is always provided as extra
metal over and above the final dimensions of the pattern.
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