I need to get a fat pattern out of a cone with knuckle attached, please refer to the model. When I flat the sheet metal, I have got 364.61mm for chord cutout and 14.43° for chord radius insdead of correct ones 311mm and 12.3° calculated by 'plate n sheet'. I am aware that the thickness will affect the results and I have applied 0.01mm to thickness, but I still cannot get the correct result. I have also checked all the other sheet metal parameters, but it seems they are all correct.
Please help. Many thanks.