The Grinder is a special addition to CraftBook that we've made that lets you turn cobble into gravel and gravel into sand. To use it, place a sign onto a piston with the text [Grind] on the second line. Every time the piston pushes the block in front of it, the piston will grind the block instead.
You can only grind blocks so quickly; if you do it too quickly, you'll find that the piston pushes the blocks instead.
If you setup an automated grinder farm, please be mindful of other players and keep the rate low. If you are collecting items in a chest, use a comparator to pause the grinder when the chest is full.
SKCraft