How to route tongue and groove flooring joints using a simple router jig I made from scrap. With this router jig one can use the hand held plunge router to cut tongue and groove joints. One can even use this jig to make a wooden floor. A simple technique one can try in a small woodworking shop if you have a router and a slot cutting router bit. In my previous woodworking video you can watch how to make this tongue and groove router jig: