After tear-out problems preparing the ceiling panels with the thicknesser, I changed the router blades. The difference is remarkable – the finish is now so smooth it almost doesn’t require sanding. I couldn’t be happier.
The three central sections of ceiling panel were run through the thicknesser and honed down to 8mm. I then used the table router to create a sort of shiplap of about 15mm width along the edge of the sections. This allows the sections to overlap when glued instead of simply butting up against each other and triples the area to be glued for a better hold.
The central section is now completely glued up ready for cutting to length and cutting the circular holes for the spotlights.
photo showing the routed overlap. The boards are 8mm thick, the overlap is 4mm x 15mm.