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## Main Question or Discussion Point

Hi, I am trying to design a 2000kg door that has dimensions of 3m wide X 4m high and will be automatically swing door operated, for a college project. I have come up with a relatively straightforward design using a motor and gears to open the door, and to close it again with a spring. I have recently moved on to the calculations section which will help me to choose my motor and its operating speed etc.

This is where I am stuck. I am finding it very difficult to come up with the torque and overall force needed to be exerted by the motor. I want to include a factor of safety also to provide for external forces such as people pushing or pulling or hanging off the door. So far I have come to the conclusion that I will use two extra duty hinges for the door.

Each hinge will have a vertical and horizontal force component. I am wondering if I should take the top hinge to bear all of the weight, or both hinges take half. And how do I calculate the torque and horizontal forces. I know torque is F.d.sin(angle), but is that all I need to do? and I know the horizontal forces will be calculated by taking moments about each hinge, but I'm not sure if the answer i'm getting is correct.

Could somebody please point me in the right direction, I have spent hours on this and made little progress. Thanks you

This is where I am stuck. I am finding it very difficult to come up with the torque and overall force needed to be exerted by the motor. I want to include a factor of safety also to provide for external forces such as people pushing or pulling or hanging off the door. So far I have come to the conclusion that I will use two extra duty hinges for the door.

Each hinge will have a vertical and horizontal force component. I am wondering if I should take the top hinge to bear all of the weight, or both hinges take half. And how do I calculate the torque and horizontal forces. I know torque is F.d.sin(angle), but is that all I need to do? and I know the horizontal forces will be calculated by taking moments about each hinge, but I'm not sure if the answer i'm getting is correct.

Could somebody please point me in the right direction, I have spent hours on this and made little progress. Thanks you