Readers agree to evaluate the significance and limitations of the information provided, and accept full responsibility for the application of this information. A question was asked about clamping pressure. As a partial answer, let me provide the following information. Pressure also squeezes out any extra glue-in fact a little squeeze out is a good thing from a visual quality aspect. With this concept of the role of pressure, then, most folks will shoot for 50 to 75 psi on the joint.
Softer woods are more forgiving than harder woods.
In any case, the wood surfaces to be glued must be perfectly mated, which is probably more important than the pressure. Firstly, thanks to Gene Wengert for providing such great support and careful data. Gluing and clamping are areas where trial and error, guesses and misinformation are common. It's great to get some solid data. I would like to ask for more.