Hi. I'm designing what effectively is a large door on hinges. The door has the following properties Mass = 336 kg Width = 1.8m The door rotates from closed position through 45deg to open position. In order to 'control' or damp the rotation of the door, I'm fitting a 3Nm friction clutch on the hinge axis. What I'm struggling to calculate is - Is the friction in the friction clutch high enough to effectively control the rotation of the door without it slamming into it's endstops in the open and closed positions? I know the torque. I can calculate the door's moment of inertia. I can guess at the force that an operator might push the door - 10N? If 10N is reasonable, then the torque exerted is 18Nm. So, the friction clutch will easily be exceeded, which is good because otherwise the operator wouldn't be able to open/close the door. But where I'm struggling is to understand how the friction will retard the rotation of the door to prevent it slamming into the endstops. Any help much appreciated. Thanks.