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The Bone and Eggshell Crusher

 
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Posts: 157
Location: Stone Baerm Permaculture Homestead
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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'.
Crushing-hand-tool.jpg
First idea - wood handle and bolted.
First idea - wood handle and bolted.
welded.png
Second idea - metal handle welded on. This is what I went with.
Second idea - metal handle welded on. This is what I went with.
head.gif
Hammer head cleaned up
Hammer head cleaned up
cutting.jpg
Getting a clean end on the handle before cutting 10" off
Getting a clean end on the handle before cutting 10" off
handle_compress19.jpg
Handle cut and cleaned up
Handle cut and cleaned up
professional-welding.jpg
My set up on an old sink with my magnets and a wood shim
My set up on an old sink with my magnets and a wood shim
crusher-progress.jpg
[Thumbnail for crusher-progress.jpg]
welds.jpg
Not super pretty but strong
Not super pretty but strong
cap.jpg
Going to weld this on top to seal stuff up and to give something for your hand to catch
Going to weld this on top to seal stuff up and to give something for your hand to catch
 
Cam Haslehurst
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Location: Stone Baerm Permaculture Homestead
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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!

bones.jpg
Bones quivering in fear as they await the Crusher
Bones quivering in fear as they await the Crusher
crushin.jpg
They don't stand a chance
They don't stand a chance
squished.jpg
You could stop here - but I want fine bone meal
You could stop here - but I want fine bone meal
sift-not-necessary-but-satisfying.jpg
Sifting away...if you're doing this in an enclosed space I recommend a dust mask
Sifting away...if you're doing this in an enclosed space I recommend a dust mask
damn-thats-fine.jpg
Final product!
Final product!
 
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Location: Northern BC Zone 3
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Nice.  I like your design.  Are you using this for raw or cooked bones?
 
Cam Haslehurst
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Thanks! And the bones are cooked. Heated on a fire outdoors for several hours I believe.
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