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Option 1 : 24.83
Concept:
Diameter of punch for blanking operation can be calculated by:
Diameter of punch = (diameter of Blank) – (2 × radial clearance) – (die allowance)
Calculation:
Given:
diameter of Blank = 25 mm, radial clearance = 0.06 mm, die allowance = 0.05 mm
Diameter of punch = Diameter of Blank - 2 × radial clearance – die allowance
Diameter of punch = 25 - 2 × 0.06 - 0.05 = 24.83 mm
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