I spent a lot of time looking on the internet for a Jig or fixture to use to install a set of quadrant hinges. The quadrant hinge is a complicated-looking L-shaped hinge that is use in the jewelry boxes that I make. It helps to remember that a quadrant hinge is simply a butt hinge with integral lid stay or stop.The arms of the hinge extend along the sides of the lid and base of the box and the internal stop bar extends from and recesses into a mortise in the box wall and lid. The jewelry box lid is supported just past the 90 degree when open by the stop bar.
The fixture that I can up with has three parts the first is a corner block assembly that is used to lock the fixture into the corner of the box or lid with “C” clamps to locate the next two part of the fixture the routing templates. The first template is for cutting the mortise for the hinge. The second template is for cutting the mortise for the lid stay or stop.
The templates are located on the corner block assembly with the two 1/8” steel dowel pins and are attached to the corner block using a 6-32 flat head screw. The templates are made so that the corner block can be flipped over and mover to the other side of the box and the templates placed on top of the corner block. The templates are made to use a ¼” – 5/16” template guide and a 3/16” router cutter.
The first photo is with the “B” side up
This is with the “A” side up
This is the layout for the hinge mortise template.
This is the layout for the lid stay or stop mortise template
The router bit is not long enough to make mortise deep enough in bottom of the box for the lid stay or stop so I used a brad point drill to make the holes deeper in the box.
This is the layout for the corner block.
I can supply a PDF of this fixture if anyone is would like one.
-- Jake Brain, Florida