Also, for the record:
Set up a large chest full of cobblestone, and have a pipe sending the cobble past 3 macerators, with a gold pipe to send them faster. In my attempts, a slow moving block was liable to try and go down a tube and fall out of the system, so an active gold pipe is needed. Loop the pipe back around so that it leads back into the main chest - you'll be drawing stone faster than the macerators can process it.
Once macerated, pull the sand produced through some iron pipes and channel it to an induction furnace, turning the sand into glass. From there, send it to an automatic work bench, converting glass into glass panes at a 16:6 ratio. Then shunt the glass panes into a recycler. At this rate, 3 macerators will produce material at slightly under the rate of recycling. It's quick enough to keep busy, but slow enough that you can add more scrap if you find the need. I had a feed chest that would dispense panes, but could also add dirt or whatever to it and it'd get recycled fairly reliably. Hooking up the recycler was a bit of a pain though, as items would often slip past it. I finally settled on a 2x2 square of pipes, with an iron pipe that would let items into the loop but not out, and a gold pipe that would keep them swirling, turning the pipe loop into a buffer system that could hold some materials while the recycler worked, and keep the recycler running at peak performance.
A large chest of stone at 12.5% scrap rate would turn 54 stacks of cobblestone into 6.75 stacks (432) of scrap. Through the conversion to glass and panes, you get 18 stacks (1,152) of scrap, over 2.5x returns. That's 128 scrap boxes, and if I'm doing the conversion right, that's 3-4 diamonds on average. I quarried a whole chunk and got 3+ large chests of cobblestone, so that's easily a dozen diamonds running through the machine! For bonus points, I had it sort garbage like wooden hoes and junk back into the recyler, so only the good stuff was kept. Sadly I deleted my world so I can't show off this messy jumble of pipes, but I had linked it to a dispenser and a repeater to auto-deploy the scrap boxes and sort them as well. It was rather glorious...
naturally I avoid forum search engines because they tend to never give any hits, so I gave Google a try.
