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Swept flange flat pattern on cylinder not accurate.

Question asked by Justin Carnahan on Aug 1, 2017
Latest reply on Aug 1, 2017 by Vladimir Urazhdin

Working on a flanged drum, so I am using swept flange. If I draw the swept flange for the I.D. of drum and put the material outside, when flattened, I get 63.23". If i draw the the swept flange for the O.D. and put material inside (creating two identical dums) I get 64.54". Which part is correct, and how should I model these parts in the future?