Rock crusher or impact mill plans? - TreasureNetApr 26, 2009 . no plans but you can make one from a large diameter pipe. have the caps on the ends to be bolted onto it for access and have a 1 inch diameter steel shaft go though it mounted on pillow block bearings. install a pully on one side that goes to either a gas engine or electric motor. inside of this chamber youll.personal rock impact mills,Rock Crusher: Mining Equipment | Find great deals on for Rock Crusher in Mining Equipment. Shop with confidence.