I am making a loft bed for my grandson and the task today was to make the side safety rail, which looks like a ladder on its side. I had never made "proper" mortises before, and I was kinda dreading it. I thought about buying a mortise machine, but did not really want to spend the money.
So I thought about using my router table, but that didn't feel safe. Then I thought about using a DIY mortise jig with my handheld router. In the meanwhile I decided to use a 1/2 inch forstner bit in my drill press to at least make the beginning and end of each mortise. Once I got started, I coudn't stop. I used that forstner bit like a mortise chisel, and dang if it didn't cut pretty good mortises. I moved the forstner bit over about an eight of an inch at a time, and it worked great. I did spend all of about a minute with a chisel on each mortise to dress the sides a little. I felt like I had discovered fire.
I used a chisel to clip off the corners of the tenons, and they slipped right in there with just enough snugness (that a word, right?). The side rail is all glued up now and in clamps for the night.
So, maybe everyone else out there already knows about this trick. But for those of you that don't, fear not the mortise.