How to rout dados with a router dado jig
Rout dados exactly as wide as the shelf that goes in them, with rails set on the shelf itself.
Chapters
How to build one: Router dado jig
A router dado jig clamps across the panel with two rails. Setting the rails on the shelf itself makes the dado exactly the shelf's thickness, so it fits without measuring.
Transcript
0:03 The router dado jig hooks the panel's edge. Lock the rails on the shelf itself, three quarters here, line up your mark, and rout along each rail.
0:14 For a half inch shelf, reset the rails on that shelf. They run past both edges, so the router clears the crosspieces as the bit leaves the panel.