I wanted to attach a frame to a chess board with nothing visible on the outside this time. Considering that doing blind dowels meant drilling before assembly, it would have removed the fiddle factor. Instead, I decided to do splines, in order to be able to slide the pieces around a bit to settle them into perfect alignment.
Now that the clamps are off and it looks fine, I'm second-guessing my splines. That worked so incredibly well, that I expect to use this technique often. Hence the questions...
As background, I have a thin-kerf blade with a 1/8" kerf. No dado set.
Firstly, is a 1/8" spline thick enough to be useful? (The pieces will usually be some flavor of 4/4 stock glued edge to edge.) I'm especially wondering if this is enough to hold cantankerous pieces at bay during a wide glue-up.
Secondly, I have a bunch of three-layer junk mystery plywood that I found inside a furniture box. It's a little less than 1/32" shy of being 1/8", and isn't quite a tight fit in the slot, but it has three distinct layers so should be better grain-wise than using some kind of solid stock. Is ~1/32" undersized too loose for a good fit, or should that be OK? Seems like I'm probably pushing what a glue layer can do here, but maybe you can make me feel better about using the rest of the plywood for this.