home battery bank*
Permies likes alternative energy and the farmer likes How Do I make a mill/grinder for bark and bone? permies
  Search | Permaculture Wiki | Recent Topics | Flagged Topics | Hot Topics | Zero Replies | World Domination!
Register / Login


permies » forums » energy » alternative energy
Bookmark "How Do I make a mill/grinder for bark and bone?" Watch "How Do I make a mill/grinder for bark and bone?" New topic
Author

How Do I make a mill/grinder for bark and bone?

Ash berry


Joined: Mar 31, 2012
Posts: 1
I am trying to figure out how to create this machine with little or no money which is completely possible because there is a huge surplus of useful garbage. I have been breaking up bark with pliers and i need a large quantity peferrable powdered or close to it. i have been lookin for some kind of grain grinding discs/plates.

i was thinking of making my own has anyone done that?

I am either going to use a deep cycle or bicycle.

If anyone has metal working skills or black smithing skills. to help me figure out how to make a grinding disc that is pretty strong.
Joe Braxton


Joined: Mar 24, 2012
Posts: 250
Location: NC (northern piedmont)
    
    9
This might be what you are looking for, or at least give you some ideas....

http://www.youtube.com/watch?v=5solgSYXeJ0

Here's a whole bunch of fun stuff...


http://home.fuse.net/engineering/ewb_project.htm
Saybian Morgan
volunteer

Joined: Apr 22, 2011
Posts: 580
Location: Lower Mainland British Columbia Canada Zone 8a/ Manchester Jamaica
    
    8
those engineer dudes are amazing i've watched all there videos, the things they can get on with with such simple parts blows my mind. I remember watching this video when I was trying to make a shredder, in the end i bought a hammermill because i just don't have the wordworking skills they have but since then i've come up a bit in skills, I wouldn't mind making a large one but I have no clue where id get the stone bit.
Ken Peavey
steward

Joined: Dec 21, 2009
Posts: 2346
Location: FL
    
  69
A ball mill would do well for what you describe: A rotating drum with the material and balls inside.
Ball Mill example video 24 seconds
As the drum turns, the balls rise along one side, then fall over, as a continuous wave. When the balls fall they smash the material. The longer the mill is run, the finer the product.
Dry material works best. Moisture allows the material to clump together.
In lieu of steel ball bearings, any suitably hard, durable material would work..,bricks, hand-packed concrete balls, perhaps mables.
Bricks would tend to erode, with fragments contaminating the product.


Seed the Mind, Harvest Ideas.
http://farmwhisperer.com
Erica Wisner
volunteer

Joined: Feb 10, 2009
Posts: 756
Location: Okanogan Highlands, Washington
    
  91
It sounds like you are thinking of building something, and those grinders on the video links are pretty awesome.
If you are more interested in getting from bark to powder and less interested in the project of building the grinder,
here's a few things I have around the house that might do this job, at least for a small quantity:

1) Connie Vandyke crushes oystershells, nutshells, and other materials by leaving them in the driveway to drive over. She puts them between some sheets of cardboard or plastic or whatever, so it's easy to collect the residue later. Not super-fast, but very little extra expenditure of effort in the course of everyday life. Should work fine for cooked soup-bones or bark; raw bones might be harder.

2) Most saws makes sawdust. Grinders make a lot of bits of all kinds. Planes make cool thin shavings.
I am currently collecting sawdust from sawing firewood in order to use it in an epoxy wood-filler for a later project, so it occurs to me that a tablesaw, or a hand-held grinder, could make any chunk of bark into dust pretty quick if you just 'saw' a kerf-thin section off the end, again and again. You could run a bundle in together if you are careful.
(I am using a thin-bladed saw because I want the firewood more than I want the sawdust; but there are very thick tablesaw blades that look like many blades stuck together, that could rip a 1/2 inch or an inch or more at a time.)
Power saws or grinders would work on raw bone as well as bark. A flywheel-style treadle grinding wheel, like for a blacksmith's shop, might be useful too, and you might be able to get a beat-up or almost used-up grinding wheel for nothing, (it wouldn't be much good anymore for tools if it was getting toothy enough to be useful for chunking up debris; you could probably cut grooves in one, but don't wreck a fancy new one this way).

3) Along the same lines, a rasp, or one of those micro-planes like a hollow rasp, will shred things pretty quick. I could see maybe setting a couple of cheese-graters or microplanes as the sides of a funnel, where they reciprocate back and forth, kinda like carding wool.

4) For chopping up straw, we often use a weed-whacker in a barrel or trash can. I believe you can get heavy-duty chain or cable instead of plastic string for a similar, but heavier, effect - they make them for the highway department to cut brush alongside the roads. This will be a nasty destructive weaponlike object, but might be very easy to scrap together. I saw somebody's chain thresher that worked on this general idea.
I would use a heavy plastic barrel or a barrel-lined pit in the ground, as the chain would make an awful racket in a metal container, and tear up any thin-walled container pretty quick.

5) The extremely slow but easy solution - bin the bark it up with some convenient and hungry insects, then wait a year or two. Removing the insects to use the powder ... lots of options depending on your location, and what you plan to use it for. I would probably use prevailing weather (solar cooker, spread it thin when it's sub-zero, or salt-water rinse if you live coastally.) There is a fair amount of powder at the bottom of our woodshed, a good sifting would get enough for most projects, if you can avoid the cats using it as a winter litterbox.
For bone, a 'bone-fire' will reduce most of the bone to ash, and brittle chunks that can be ground easily or absorbed in-situ by plants.

Likewise around our place, I use whole big bark chunks for medium-tough jobs like lining paths, or as roofing material for birdhouses, bee shelters, etc. Smaller chunks might be useful as horse bedding or for dry footing when the thaw is turning their favorite paths into puddles.

If I want powdery wood debris, I go for the shop-sawdust pile, or a duff log with lots of powdery punk that I can easily crumble in my hands.

Interested to see what you come up with, and what it's for.

-Erica


Play with nature, make nifty stuff:
www.ErnieAndErica.info
Robert Fairchild


Joined: Jun 29, 2012
Posts: 6
Location: Kentucky, USA
Serious hand mills are available that will grind bone:
http://www.lehmans.com/store/Kitchen___Grain_and_Grain_Mills___High_Speed_Grain_Mill___2360#2360
not cheap but shows it's possible and might work as a model.
Manufacturer's website:
http://www.csbellco.com/grinding-grist-mills.asp
another interesting model:
http://www.howex.com/
Discussion of hand mills:
http://www.motherearthnews.com/modern-homesteading/manual-grain-mill-zmaz80ndzraw.aspx
another hand mill that claims to grind bones:
http://www.pleasanthillgrain.com/wonder_junior_grain_mill_hand_grinder_wondermill_wheat_flour.aspx
Rachel Morton


Joined: Jun 10, 2012
Posts: 7
Location: NW Oregon (Zone 8)
Great question Ash and thanks for asking it. We are also in the look out for a bone grinder.

Another thanks to those above for wonderful suggestions
 
I agree. Here's the link: http://permies.com/battery
 
subject: How Do I make a mill/grinder for bark and bone?
 
cast iron skillet 49er

more from paul wheaton's glorious empire of web junk: cast iron skillet diatomaceous earth sepp holzer raised garden beds raising chickens lawn care flea control missoula electric heaters permaculture videos permaculture books