Thanks to all of you that responded to my last question about mounting the router to the table saw.
http://www.sawmillcreek.org/showthre...772#post939772
Originally I was skeptical that this was a good idea but after reading your responses it looks like you can have your cake and eat it too.
So on to the next question...the top. In my reading I see that table sag is a big issue. This prompted me to take a critical look at my current table. It's just a 2x4 frame with a double 3/4" ply top covered with laminate. The router is an old PC 690 attached to 1/4" plexi. It's simple but has served well for many years. Sure enough, there is a little over 1/8" sag across the table.
So, if a PC690 can cause sag in 1 1/2" of plywood, I wonder what a PC 7518 will do. I know a cast iron top is the ultimate answer but I've already spent more $$$ than I wanted too.
I'm wondering if a torsion box approach is the answer. For example a double layer of ply or MDF on top, a narrow (2 1/2" - 3" torsion framework with a thinner skin on the bottom.
Will this work or do you have a better idea?
Thanks in advance for your help.