|Project by woodenwarrior||posted 12-14-2013 12:25 PM||2707 views||23 times favorited||10 comments|
I’ve become a lot more disappointed with my hollow chisel mortise machine the past few months. It’s finicky to set up, the walls of my mortises are rough and less than perfect and the support for the work piece is less than ideal…it’s just an all around PITA. I decided to build this jig based on a desire for a quicker, repeatable more accurate way to make mortises.
This jig is a hybrid of a mortise jig from Shop Notes #64 and an idea I found on here from TJU at http://lumberjocks.com/topics/27176 . This jig will produce mortises for loose tenon joinery in end grain as well as traditional mortises.
The jig works by trapping the router edge guide in a slot in the back of the jig enabling the router lateral movement only. This takes a lot of the error out of making mortises. The body of the jig is nothing more than a couple of 2×4 pieces dimensioned and cleaned up at the jointer/planer. This is a attached to a plywood base with room for clamps to attach it to the work surface Two sliding plates limit the travel of the router. The plates are lipped in the back to help register them against the jig.
The plate that registers the workpiece has a shallow cross grooved key way to accept a hardboard key on the back of the support plate. I can mortise pieces up to 1 1/2 inches thick with the clamp set up I currently have. By replacing the clamp set up with a thicker mounting block I can extend that thickness to 3 inches or so.
-- Do or do not...there is no try - Master Yoda