This is the follow up to a rolling router jig I made a couple years ago( https://www.lumberjocks.com/projects/388121 ) and never had a project for it until now. So that made me have to build the base for the rolling jig and I designed it so the rails are adjustable. I have it set at the highest position for this tapered mesquite round piece. I have two bolts and pins on each side to secure the rails. the pin holes have brass bushings in them made from 38 special cartridges . As I get into different thickness slabs, I'll spot more screw and pin holes for that height. The rails are 7” high and the base is 30” wide and only 38” long and I don't do any big table slabs but I could by sliding them through on another board to keep the height uniform. This tapered round is going to be a lamp base after it is turned on the lathe.It has aluminum clamps for holding the piece secure. I think a real heavy table slab would stay in place, but I like to clamp things down to insure they don't move during the cut with a 2” router bit. I used 1/4' screw-in inserts for the clamps and will probably put in a whole lot more in as I find uses for this jig.I did the cutting in my basement shop and I would recommend to always do it outside. It was cold out and I was like a kid with a new toy….......could not wait until tomorrow to run it!! It left a pretty good mess!The base is 3/4” maple plywood and the side rails are 1” Baltic birch plywood.The following are some shots of it in use on that round.: Cheers, Jim
This is the follow up to a rolling router jig I made a couple years ago( 
Cheers, Jim