PC 7539 and table sag -
Hi everyone, new guy here although not new to woodworking.
I have a PC7539 mounted in my router table which was constructed of 2 sheets of 3/4" MDF laminated together, covered on both sides with laminate, and edged in cherry. The router itself is mounted to a Rockler aluminum insert which does not have a problem with sag. This is the second top I've made, and for the second time, this tabletop has sagged to the point that it's visibly affecting whatever I'm routing. I discovered this whilst routing beading for a bookcase I'm building, and now this problem has caused the bookcase project to come to a complete halt.
I've read through some of the archives so I know some of you are using the same router (I had been considering selling it and buying a lighter-weight machine), but regardless of what I do I need to do something about the sagging top. I suppose my first question is whether or not I can fix the current top or whether it's even worthwhile to attempt a fix, and then the second question would be by what means do I stabilize a new or repaired top so I don't have to worry about the sag. If I make a new top I would consider sandwiching steel bar stock within the MDF, as suggested by Wally Kunkel in his tome on radial arm saws. If I attempt a repair to the current top I was considering just milling some hardwood ribs to attach to the underside of the table, removing the laminate from the underside somehow, and with glue and a heck of a lot of clamping pressure bringing it back to flat, but I don't know if even can get it to flat that way - there's about a 1/16" dip in the center of this thing.
Sorry to be so wordy, but I couldn't explain in enough detail with fewer words.
Thanks in advance for your thoughts