Häfele 180D Concealed Hinge (18–20 mm)

Instructions

Although the drawing is not vertically symmetrical it can be positioned centrally due to the artboard positioning and top guide line. The "butt" of the hinge is at the bottom of the drawing. So, if you are cutting into a side panel the file will be at the bottom edge. The body of the hinge is actually 3 separate horizontal cuts. This is done to minimise material removal and simplify the process. Depths/Dimensions • Screw holes are 3 mm diameter and set for ⅝" (15.88 mm) screws [File depth = 16 mm] • Leaf depth 1.5 mm • Minimum body depth 16.6 mm (File depth = 17 mm) The actual leaf size is 39.5 mm × 12.3 mm though the mechanism requires an additional 0.434 mm clearance on the opening side. I therefore positioned the drawing 0.434mm down the artboard to ensure it was centrally positioned vertically. Be aware that these hinges, if set flush, allow for less than 0.25mm of a reveal. Some cabinet makers therefore set the depth of both leaf rebates to 1 mm instead of 1.5 mm to create just over a 1 mm reveal. If this is the case you could also reduce the body depth by 0.5 mm to 16.1 mm. The 3 mm stock bit will not provide 15.88 mm depth, particularly if working with Shaper Plate. I typically go as deep as possible to provide a drill guide of sorts and finish with a 3 mm drill. This might not be necessary if working in softwood, but is essential in harder woods such as Oak, particularly when using brass screws that are likely to shear. These dimensions are precisely the size of the hardware, you therefore might need a slight negative offset on the leaf cut.