There is still masses of cobble present in the short runs (I presume you are referring to direwolf showing around eloraams build)
Even easier then that put a chest on the back of the block breaker then use a retriever with a retrievunelator(sp
) next to the inv you are supplying hooked up to the pipes to the chests it will only pull whats required and in stacks of 64 0nly always keeping the inv on the machine full.
insulate the wires and put a torch next to the timer.
It was the machines exploding for some reason or another. maybe it was a hv supply and the paste didn't include the transformers.