I've got some ideas about how I could make tenons given my limited tool set, and I figure a plunge router (which I don't have yet) and a template would take care of a *rounded* mortise. I'm wondering how you guys square off the mortise. I assume that unless you have a dedicated mortising machine, you use some sort of chisel(s), but what kind?
Do you use anything special, or just regular chisels? I've seen a corner chisel, if that's the right term. I don't mean the kind they sell for hinge mortises. It's a fairly long chisel with two cutting edges at a right angle. I also see square chisels, which look very much like the hollow chisels that are used in dedicated mortising machines, but with a handle to be struck with a mallet. Lastly, I've seen mortising chisels, which seem to be twice as thick as regular chisels.