If You Are Super Serious About Cardboard Shredding…

…and you happen to be a pretty skilled DYIer…

…this crazy DIY cardboard shredder might be for you!

Just watch those fingers!!!

Thanks to Mark for sharing this.

On a related note – be sure to also check out this small hammer mill that Larry Hall shared on the Facebook group!

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    • Dave Pawson
    • March 5, 2015

    From the UK, what’s a hammer mill please?
    You don’t give a name for the device that means
    much to me in the UK?

    It looks like a garden waste shredder? Is that what it is?

    • Debbie
    • March 5, 2015

    Dave to your question the machine looks like a leaf shredder to me.

    • Dan
    • March 5, 2015

    Basically. I never heard of a “hammermill” either, but there’s wikipedia. http://en.wikipedia.org/wiki/Hammermill I gather it’s what it sounds like — it grinds with blunt “hammers” rather slicing with blades.

    • Paul from Winnipeg
    • March 5, 2015

    That’s right Dan. I use a hammer mill at work to make feed for pigs out of barley, corn and soy meal. The way that one works is several rows of 3 hinged ‘hammers’ ( 1/4″ or so sheet steel, nearly looks like a propeller when spinning) arranged on a shaft nested in a cylinder of ‘screen’ (heavy gauge sheet metal with specific holes punched to make a screen). Ingredients are fed into the cylinder and smashed by the rotating flails until it’s flung out through the screen. Augers pull away the resulting product.

    The one in the video is a little kid brother.

    • Francis Roy
    • March 5, 2015


    A hammermill is a machine that smashes materials into very small pieces. One would use a hammermill to smash rocks into rock dust, for example, or to shred car tires into tiny bits. Think of it as a shredder that operates by chipping at a material like a hammer would chip the edge off of a stone, rather than slicing like a paper shredder or lawn mower.

    This is one example of a hammermill, with exposed workings.


    • Mike
    • March 5, 2015

    That’s a great grinder that Larry has. Can we find out the manufacturers name and where we can buy one?

    • Bentley
    • March 5, 2015

    Here is a link to the product itself (not sure why I didn’t include that in post):

    A friend of mine used a larger hammer mill to pulverize cardboard, and the resulting material was pretty amazing!

  1. Thanks all, now clear – not sure I’ve head of this in the UK… perhaps I’ve
    been too sheltered!

    • sursgcnegecr
    • March 6, 2015

    That’s pretty cool. On a smaller scale I’ve found that my cross-cut paper shredder does just fine on the cardboard boxes that I get from amazon as long as I tear them into strips before feeding them in.

    • John
    • March 10, 2015

    Did Larry ever try it with corrugated cardboard and if so how were the results?

    • Jeshua P
    • March 19, 2015

    I just use a heavy duty cross cut shredder like you can find at a local office supply store. I think mine can handle roughly 16 pages at a time and has a good continuous run time. I can run through a lot of cardboard before it gets hot and needs a break. Think it cost me @$250. I managed to fill a 24×24″ pass through bin with a mixture of shredded cardboard, peat moss, and food and my worms are doing great even after I all but forgot about them most of the winter and left them in a garage that stayed in the 30’s and 40’s all winter. The shredder is a lot cheaper and dare I say a lot safer than some of the options shown above.

    • Barry Hocking
    • April 1, 2015

    Hi All, Yes a hammer mill. It is for cracking grain for feed. You can also buy different screens sizes, We have been using one for years. Barry.

  2. We have many 10hp and larger rotating flail shredders (chipper shredders or hammer mills).

    TroyBilt makes several types and sizes and cost over $1,000 new. They can be purchased on eBay for about $400. Look for only the right kind of chipper shredders that have exit screens with holes from 1/4” to 1”.

    These are very useful for shredding leaves, branches, garden waste, horse and other manures, compost, dried casting clumps, fruits and vegetables, pumpkins, corrugated cardboard and paper (into a fluff), into a fine worm friendly bedding or food.

    Patrick Perry

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