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Thread: On not getting stoned

  1. #1
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    On not getting stoned

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    As I was sifting through my latest batch of Y.M. Ismaili checking for stones, I got to wondering if there were better, more foolproof ways to weed out rocks and concrete chips. At the moment I just take care as I pour the green beans into the roasting pot. After roasting I trickle them slowly into a bowl and then trickle them again slowly into their final resting jar, all the while keeping an eye out.

    What do other people do? (And how do the commercial roasters do it?!)

    There must be ways to filter out rocks based on their heavier weight, but perhaps not simple enough for home use. Then again, I look at pics of the roasters some people are building here and realise some of us love an engineering challenge.

    Rob

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    Re: On not getting stoned

    My grandma had a method to do this when she was hand sorting her spices - mainly for coriander seeds, IIRC.

    A large flat-ish woven thingamajig, with a slight lip at the mouth and a much larger lip at the end that is held (bit like panning for gold/gems in a river). By tossing the seeds from back to front, she seemed to be able to seperate the heavier stones from the seeds. This harks back to my toddler days and Ill have to harass her when I next speak with her. Stay tuned...

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    Super Moderator Javaphile's Avatar
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    Re: On not getting stoned

    If you wanted to see a big one there was a 500 pound commercial de-stoner that was up for sale on evilBay, item number 7568729392.

    Java "No stones please!" phile

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    Re: On not getting stoned

    Wow! Thats fantastic. Whod have thought theres such a special-purpose gadget. Sure, they can make a 500lb de-stoner but lets see them come up with a 500g one!

    Rob

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    Super Moderator Javaphile's Avatar
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    Re: On not getting stoned

    Quote Originally Posted by Robster link=1136439267/0#3 date=1136451805
    Wow! Thats fantastic. Whod have thought theres such a special-purpose gadget. Sure, they can make a 500lb de-stoner but lets see them come up with a 500g one!

    Rob
    Yeah, I would think it would be pretty easy to pick out a 500 pound stone. Why would anyone need a special gadget for that? ;D ::)

    Java "Always looking for a new gadget" phile

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    Re: On not getting stoned


    Hehehe

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    Re: On not getting stoned

    That one picks out the boulders, and it leaves the little ones to wreck your grinder. Very kind indeed!

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    Re: On not getting stoned

    Better than trying to roast it in your 500lb capacity roaster and wondering why you cant get to 1st crack.

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    Mal Dimal's Avatar
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    Re: On not getting stoned

    Hi All,

    What about using one of those salad/veggie drying gadgets, you know the ones that use the principle of centrifugal force in a spinning cage? You just pull a string kind of like starting a lawn mower and the cage starts spinning throwing off all the water...... might work with rocks too :-?

    Mal.

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    Re: On not getting stoned

    I like the centrifuge idea, Mal. With small amounts of beans and a really fast spin the stones may end closer to the centre. But you may need to pick them out while the things still spinning.

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    Re: On not getting stoned

    Robster,
    I have encountered a few rocks in Ethiopian Mao Horse, during the grind! >:( Since then I scrutinise after the roast by pouring the beans onto white paper or silver foil (depends on how soon after roasting - if I jet cool then paper, if I slow cool, silver foil). I find its easier to pick out color and size variation post roast because I keep my roasting to about 300gms. ;)

    Cheers

    Boris

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    Re: On not getting stoned

    Did I ever tell anyone about my K-Mart bean cooler? Well, its pretty good for helping keep an eye on rocks too. Its a wire basket, originally meant to be a household magazine rack (ugly), is roughly 40cmx25cm and 30cm high, and it comes with a lid that fits over the top. Its covered with what appears to be hard, black paint, although it could be a plastic coating, I dont know. Anyway, its great for cooling things down, just dump beans in, put on lid (or not) and make air pass thru it while shaking/stirring - Ive used a strong wind, a fan, and just shook it until the beans are cool, works quite well. I just put a handful or two of cooled beans on the lid, which has a 3cm lip, and shake it around side-to-side a bit and look for stones. Theyre pretty easy to spot this way, they move quite differently to beans, and in most cases are easily spotted because od their colour. Ive also sorted them this way on a baking tray when I didnt have the lid around - possibly a little harder to spot.

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    Re: On not getting stoned

    I tip my beans out of the popper onto a pizza tray (which I hold a big fat fan over to cool the beans). Every stone Ive encountered seems to be very white/with a yellowish tinge, so they stand out immediately against the brown coffee beans and the non-stick coloured pizza tray.

    No stones in my grinder yet! (touching wood)

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    Re: On not getting stoned

    How common is this problem? *I am new to home roasting (havent tried it yet, still getting the gear to try a heat gun) and didnt realise beans may come with rocks :exclamation!

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    Re: On not getting stoned

    Its quite common but its not really a problem. I just pour the beans - once roasted - onto a tray; it takes about 6 seconds to scan through the batch for anything youd prefer not to consume.

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    Senior Member robusto's Avatar
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    Re: On not getting stoned

    The number of posts here will give you an indication of the commonality of stones....But having said that, Ive encountered just ONE stone in my roasting/grinding experience.

    Luckily no damage was done to the grinder....just a few frayed nerves.

    Robusto

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    Re: On not getting stoned

    Thus far, I have not had any rocks.
    When I finish roasting, I dump into a sieve to stir and cool. I always check for stones during this step.
    To get the beans from roasting to inside, they then get dumped into a bowl and then either into the jar or into bags, so I check them a couple more times along the way.


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    Re: On not getting stoned

    Quote Originally Posted by fatboy link=1136439267/15#16 date=1141087100
    Thus far, I have not had any rocks.
    There was that one stone in my mazzer that came from your roaster, but technically thats my rocky experience ;)

    That roast swap thing was fun, we should do it again sometime.

    On rocks, yes they can be common. Some regions have distinctive processing that lead to more rocks in the bag than others. As someone mentioned Ethiopian Harar and Yemen Ismaili are regular CS beans that Ive seen this with, but theyre not alone.

    A commercial roaster uses one of those destoners as mentioned below, but us plebs have to find some other way. Im sure a 500g variant on this theme cant be that hard to make. Framey, once youve done with the roaster, get cracking on a destoner. I will find you a hair dryer for the fan :) Seriously though, they arent that technically advanced, it should be possible to replicate at home. Not sure how *yet*. Anyone with ready access to one that they can describe the function?



  19. #19
    Senior Member fatboy_1999's Avatar
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    Re: On not getting stoned

    Behmor Coffee Roaster
    Quote Originally Posted by poundy link=1136439267/15#17 date=1141775828
    There was that one stone in my mazzer that came from your roaster, but technically thats my rocky experience ;)
    Like I said, I havent had any :P

    Yes, the blend swap was good fun. We should look at doing it again.

    After reading your post however, I am now waiting for the "De-stoner 2000" to be unvieled by one of our more inventive members.



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