C = B + K - D D = E - A C = B + K - D D = E - A C = B + K + D The chocks are calculated according to three variables: (A) the hinge constant (k).s (B) the distance from the drill in the door (b). (C) the degree of overlay of the door on the side in the cases of full and half overlay, or the gap between the door and the side for the full inset version (d). In these conditions, the formulas used to calculate the heights of the plate in the three different types of arm are shown below. HALF OVERLAY FULL INSET FULL OVERLAY The number of hinges required depends on several factors, including the type of hinge, the door’s weight, height and width, etc. For this reason, and given the number of variables, please check the charts for an estimate (next to the diagrams in the catalogue). You are advised to place the upper and lower hinges at least 80 mm from the edges. When dealing with low or particularly wide doors, the distance to the edges must be reduced as much as possible. Main factors are door width and weight. See diagrams as below, for every hinge later. It is advised to locate upper and lower hinge at less than 80 mm from each edge. These are the different heights of the mounting plates in order to correctly overlay the door on the side. HEIGHT OF THE PLATE REQUIRED NUMBER OF HINGES AND HOW TO ARRANGE THEM ON THE DOOR CALCULATION OF THE HEIGHT OF THE PLATE Hinges/Door HINGE GROUP 21