I love the spline joint. Itís fast and strong. I always use plywood for the spline material.
The router with a roller bearing makes a very clean, fast cut. Iíve cut a lot of splines with the router.
I prefer a blind spline. Start the cut 2Ē from the edge and stop the cut 2Ē from the opposite end.
A spline is Stronger than biscuits.
I cut my splines 7/8Ē wide from good 1/4Ē plywood. The router cuts 1/2Ē deep. This leaves a little room for glue a assures a good tight joint.
Iíve never had a splined joint fail. I have had a biscuit joint fail.
If you don't have time to do it right the first time, when will you have time to do it over?