I've just come across the Euro Spec (
- For three hinges the centres of the top and bottom should be about
- For doors with an overhead closer, the middle hinge should be set some 450 mm from the middle of the hinge to the frame head.
- If the door is heavier than normal or more than 1000 mm wide, it requires 4 hinges. These should be equally spaced with the top and bottom hinges again centred 250 mm from the top and bottom.
- If that door has an overhead closer, the second hinge down should be set as for door 2.
So now all I have to do is design a hinge jig with the required centres using a variety of router cutters and followers that allow me to use it for 3 and 4 inch hinges.