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Making 100% flat Table for Solid Wood Working4/19
I heard that glue two piece of plywood will ensure 100% flat table. I am going to make at least 8 feet long table, is that ok? Otherwise any technique?
For saw track, i find even ruler is not straight. foot level is the only option? ty
I find woodworking is not that simple..
Gluing two pieces of plywood together will NOT ensure a 100% flat surface.
The only way, that I know of, to get a flat surface is to calibrate the core with a good, well-maintained calibrating sander.
If I was doing it, I would use a MDF/HDF core, calibrate/sand it on both sides (also both sheets if you need them to make the desired thickness), glue them together and calibrate it again. Even then I wouldn't guarantee a 100% flat surface.
The table is only as flat as the floor. The floor is only as flat as the foundations. The foundations are only as flat as the grading. The grading depends upon the equipment used.
I suggest you get an operator's license, and then buy something like a CAT D-35 with a laser guided blade for leveling. After the site is leveled to within 1/100th of and inch, then it is time to get ready to pour concrete. It is important that the concrete be troweled and leveled to even less than 1-/100th of an inch.
Once you have all that, then post again, and we'll talk about cutting work bench legs to length, accurately.