As I described in my previous posts, I had a great method for jointing the boards that would make up the first of two tops for the desks I am making for my sons. I also mentioned at how a perfectly valid engineering method doesn't always apply perfectly to organic projects (i.e. wood).
For the second desktop, the process was much smoother. I took each edge pair and flattened it across their length. Often there was a hump or a valley in the middle so much of that work was focused in a specific area before using a jointer plane across the length. Next, I would take any twist out of the edge.
Note, I didn't flatten the faces of the board because I find that this removes thickness from the board and I always have to flatten the entire glue up later anyway which removes more thickness. Removing thickness once, gives me better control on the resulting thickness of the glue up.
Removing twist involved a pair of winding sticks (2 straight edges that have the bottoms straight but also the top edges are parallel to the bottom edges, you sight down the length of the board and the winding sticks should be exactly parallel. If not, the twist is very exaggerated so you can fix it) and a lot of spot fixing with my smoothing plane. I used the smoothing plane because it took off a whisper thin shaving so I could control the fix.
After the twists are removed, I verify that the length is still straight and then it's time for testing the glue up. I put the edges together and clamp just the middle to see if I have removed all gaps. If not, I do some more spot fixing and then try again. Usually after 2-3 tries, it's perfect. I keep adding the joints rather than testing alone since I really care about the entire finished surface.
Once the joints are all good, I set up the clamps and do a quick dry fit and then it's time for glue.
While clamping, I do try to flatten each joint but it isn't always possible since these boards are 5/4 thick.
Next, I need to sharpen my hand plane blades and then I can work on the initial flattening of the desktops. After that, I'll set them aside and start working on the bases for the desks.