|Project by Scott||posted 442 days ago||6246 views||60 times favorited||32 comments|
This jig works in conjunction with your router and its edge guide. It has a fixed stop on one end and an adjustable stop on the other end to limit the length of the mortise. The guide helps to support the router and keep it square. The tabs on top of both long pieces of the jig make it very easy to align it flush with the workpiece. You can use this on any length workpiece, short or long.
If the mortise is closer to one end of the workpiece, and you need to make several pieces identically, then you can add another adjustable stop, so you can easily get repeatable results. See photo 3.
If the mortise is wider than your largest bit, then just move the router to the other side of the jig with the stops in place and cut the other side of the mortise slot.
The mortise jig is made from 1×3 dimensional lumber, so really 3/4×2.5. It is the premium pine from Lowe’s hardware, and it is very straight. I glued two together for each rail. The length is 24 inches.
-- Scott in North Carolina