I have made my own jig to cut finger joints on a table saw with 1/4-inch dado blades. The joints are way too tight. I can not fit the two pieces together much less get any glue into the joint. I have put a couple pieces of paper between the two plates of the dado head and that has helped but not solved the problem.
What’s the secret to cutting the joints so that they slip together? So far I’ve spent a lot to time with sandpaper or a rasp to get the two pieces to fit together. I tried replacing the two sheets of paper (as a spacer) with an old CD but that resulted in excessively loose joints. This did show me that any spacer actually had an additive effect over four or five joints.
Any help would be greatly appreciated. Grandpa H.