Here is a neat kitchen gadget that can crack open walnuts, pecans, and everything in between. It has dual modes, so you can go from manual to automatic. The system is adjustable, so you can use this with a variety of nuts. It has footprint of 6.69 x 11.02 x 3.54 in.
You can clean this machine with warm water and a piece of cloth. This can crack 40 nuts per minute.