This tool has been a while in the making, but I'm just about done making it. The idea came from struggling to crush bones and eggshells in large quantities. An 8lb sledge was used originally, but it got tiring to keep a good grip on it. So I'm basically adding a handle to make things much easier to grip. I guess you could say it's one part of a giant mortar and pestle. It's all from scrap, so the first little while was spent hunting around the property for handle materials. Once I found a tube that would work, I cleaned it, measured, and cut it. I also cleaned the rust off the hammer head. In addition I ground down one end of the head down to bare steel to make sure I got a good connection for the welding. It takes some extra time, but makes the weld both easier to do and it ends up being stronger. Today I welded them together, succesfully I might add. I did several small beads to avoid burning through, and so I could rotate the tool. It was an awkward set up but it ended up working well.
Now to just add the rectangular cap to seal stuff in and it will be ready to get crushin'.
The crusher is complete. Got the little plate welded on and it is very easy to pick up and drop now. Does it work though? I say heck yeah it does. Take a look at the pics. Might I add that I am not at all tired out. It's because I don't need to use my muscles to push the hammer down into the bones, gravity does all that. All I need to do is to lift and drop it. I was doing it with one arm, but it can be done with two as the handle is long enough to accomodate two hands.
Now if we're going to go full-lazy, the next step would be to drill two holes in the top plate for a U-bolt to go through. Then tie a rope to the u-bolt, and get it into a pulley - maybe from an old clothesline. Attach the pulley to something sturdy, then use the rope and pulley to lift and drop the hammer while you maniulate the bowl with your feet to make sure the hammer isn't hitting the exact same spot every time. Voila - gorgeous bone meal without electricity and without strenuous effort!