Tutorial:Cobblestone Generator

First you find where you want it then you put one of any block down next count 3 blocks in every direction (except diagonal up and down) at the third block go out to the blocks to the right and left of it and dig down one after that go to the corners and place water in each ( since in minecraft water and lava flow towards holes the water will not make a mess) then (if your world is lucky enough to have lava on survival) get your lava bucket and put the lava on the block in the center. Then you should have a fast, infinite cobblestone generator that generates a TON of cobblestone each time there are only 2 problems I can think of for this :

very space consuming and a few pieces of cobblestone are out of reach

If you would like to add any info or problems about this cobblestone generator please edit but don't delete the already existing info unless it is outdated please.