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The cutting blanks equation is, $$F=l*t*s$$ L=length mm t+thickness mm s =shear N/mm^2 We measure the perimeter of the blank and then add the circumference of the two holes. $\text{The straight sides are 2*70mm =140mm and 2*( 70-40-20=10)mm=20mm =160mm}$ $\text{half circles are 2*pi*20=125.66mm, inner holes 2*2*pi*15=188.49mm} $ $\text{ Total 188.49+124.66+...


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So why not calculate the cut length ie perimeter and use that with the thickness - the cut length is what you get with pi * D in your single blanking example.


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