woodnaquanut
Active member
The distance is equal to the thickness of the piano hinge metal. when closed both pieces touch. Routing is a good idea, I just used a tablesaw.
It's also possible to mortise in the leaves of the hinge. This just leaves the knuckle showing and both pieces of wood touch.
Sorry, I speed read the thread and don't know where you are using the piano hinge. There are also PHs with an extra bend in the leaf for extra strength. Look for 'wrap around' like:
http://www.rockler.com/full-wrap-around-slotted-piano-hinges







