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Thread: Stones 'n stuff I've found in coffee...

  1. #1
    CoffeeSnobs Owner Andy's Avatar
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    Stones 'n stuff I've found in coffee...

    In the last two years I have found a couple of stones in CS greens and this week I found a spare metal zipper tag
    The zipper find is a first, I've not seen any of those floating around in the bags but anything is possible with a raw product.

    ...which is why every green bag says on the sticker:

    NOTE: This is a raw product direct from coffee origin and could contain
    foreign objects that you would prefer not to come in contact with your
    coffee or coffee making equipment. Please process with care.


    I'm glad you found it before tossing them into the grinder!

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    Senior Member Yelta's Avatar
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    Quote Originally Posted by Andy View Post
    The zipper find is a first, I've not seen any of those floating around in the bags but anything is possible with a raw product.

    ...which is why every green bag says on hte sticker:

    NOTE: This is a raw product direct from coffee origin and could contain
    foreign objects that you would prefer not to come in contact with your
    coffee or coffee making equipment. Please process with care.


    I'm glad you found it before tossing them into the grinder!
    This is another recurring subject, found a stone in my green beans (shock horror) checking is no big deal, you get a number of opportunities to do this throughout the roasting process, when weighing out the beans, while tipping the beans into your roaster, in my Coretto during the roasting process, in the bean cooler and the last line of defence as you tip your beans into the grinder hopper, you simply need to keep your eyes open.

    Over a few years I've probably found 8 or 10 foreign objects while roasting, and as far as I know have never had one pass through my grinder, I said it before, this time I'll shout it, KEEP YOUR EYES OPEN.
    Last edited by Yelta; 7th February 2013 at 12:16 PM.

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    Senior Member CafeLotta's Avatar
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    Quote Originally Posted by Yelta View Post
    This is another recurring subject, found a stone in my green beans (shock horror) checking is no big deal, you get a number of opportunities to do this throughout the roasting process, when weighing out the beans, while tipping the beans into your roaster, in my Coretto during the roasting process and finally in the bean cooler, you simply need to keep your eyes open.

    Over a few years I've probably found 8 or 10 foreign objects while roasting, and as far as I know have never had one pass through my grinder, I said it before, this time I'll shout it, KEEP YOUR EYES OPEN.
    Good advice to KEEP YOUR EYES OPEN before dumping beans into your grinder. Last week I had just finished a roast of Indian Mallayanagiri Geisha and was tipping them into a valved coffee bag when I noticed a foreign object. It was about the size of a half pea and appeared to be a piece of hard baked clay like a brick chip or similar. It made me shudder to think what it would have done to the grinder. Luckily its the first foreign object I've found so far but has now put me on alert to carefully check any beans before they go into the grinder.

    P1000217(1).jpg

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    Senior Member Yelta's Avatar
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    Quote Originally Posted by CafeLotta View Post
    Good advice to KEEP YOUR EYES OPEN before dumping beans into your grinder. Last week I had just finished a roast of Indian Mallayanagiri Geisha and was tipping them into a valved coffee bag when I noticed a foreign object. It was about the size of a half pea and appeared to be a piece of hard baked clay like a brick chip or similar. It made me shudder to think what it would have done to the grinder. Luckily its the first foreign object I've found so far but has put me on alert to now carefully check any beans before they go into the grinder.
    Most of the stones I've found have been fairly soft material, and I suspect would pass through a grinder unnoticed, however a couple have been granite, these would certainly be difficult for the average grinder to digest.

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    Senior Member Vinitasse's Avatar
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    Quote Originally Posted by Yelta View Post
    Most of the stones I've found have been fairly soft material, and I suspect would pass through a grinder unnoticed, however a couple have been granite, these would certainly be difficult for the average grinder to digest.
    It could have been worse... two days ago I came across a disposable lighter in a bag of AAA grade beans from Tanzania. Would have been very interesting if it had gone into my drum roaster but the old Mark I Eyeball caught it just in time.

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    Senior Member Vinitasse's Avatar
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    Quote Originally Posted by Vinitasse View Post
    It could have been worse... two days ago I came across a disposable lighter in a bag of AAA grade beans from Tanzania. Would have been very interesting if it had gone into my drum roaster but the old Mark I Eyeball caught it just in time.
    As an aside... it makes you wonder if the AAA grading means all that much

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    Senior Member fatboy_1999's Avatar
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    It might have been an AAA grade lighter.

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    TC
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    Nice!,

    I'll see the lighter and raise with a drop (imitation) pearl earring.

    Thanks CS destoner

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    Senior Member CafeLotta's Avatar
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    Quote Originally Posted by Vinitasse View Post
    It could have been worse... two days ago I came across a disposable lighter in a bag of AAA grade beans from Tanzania. Would have been very interesting if it had gone into my drum roaster but the old Mark I Eyeball caught it just in time.
    May have been a batch of beans that were originally destined for the local Tanzanian market - "comes with bonus lighter" - for that wood fired roast

    Roasting coffee African style - YouTube

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    Senior Member Vinitasse's Avatar
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    Quote Originally Posted by Talk_Coffee View Post
    Nice!,

    I'll see the lighter and raise with a drop (imitation) pearl earring.

    Thanks CS destoner
    Hmmmm... it would seem that the Fair Crack dividend is paying off for the locals.

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    Life-long Learner DesigningByCoffee's Avatar
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    Had a dried corn kernel the other day - popcorn in the corretto! There's a reversal if ever I saw one!
    Matt

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    Senior Member chokkidog's Avatar
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    Good one Vinitasse! Well spotted, did it still have fluid in it?

    When I was in vineyards the worst MOG (material other than grapes) story I heard was of a bicycle being tipped out
    of a fruit bin, with the grapes, into the hopper of a big crusher. I made people at vintage time empty their shirt pockets;
    glasses, medication, cigarettes, telephones, ipods............

    After seeing some commercial roasters collections of 'foreign objects' nothing much would surprise me.
    Other than steel (nuts, bolts, nails, wire) the worst I have seen is bits of plastic from the cherry picking
    buckets which have actually gone through a roast. Anyone for notes of slightly melted bucket?! That and
    a really mean looking, very hard black stone about the shape and size of a roasted coffee bean.

    Corn pops up from time to time in my collection :-0
    Last edited by chokkidog; 7th February 2013 at 06:21 PM.

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    Senior Member Vinitasse's Avatar
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    It was about one third full... and I wonder what it would have done when heated to 220 degrees and being tumbled around with my beans.

    And... speaking of MOG... at one of the vineyeards I worked at the mechanical harvester would dump 1.5 blackbirds per tonne into the crusher destemmer... just added to "le gout de la terroir" I guess

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    Senior Member Yelta's Avatar
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    Quote Originally Posted by DesigningByCoffee View Post
    Had a dried corn kernel the other day - popcorn in the corretto! There's a reversal if ever I saw one!
    Matt
    Yep, I've found a few corn Kernels from time to time, someone on this forum (may have been Andy) once commented the same equipment is used to process both corn and coffee.

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    CoffeeSnobs Owner Andy's Avatar
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    two days ago I came across a disposable lighter
    Wow, far better to find that before you roasted it!

    it makes you wonder if the AAA grading means all that much
    You have more chance of getting something odd like that in a AAA grade than in a B grade coffee.
    Why?
    AAA is all the beans that didnt go through the largest #20 screen.
    B grade had to fit through a #20, #19, #18, #17, #16, #15, #14 size screens and your lighter wouldnt do that.


    I'll see the lighter and raise with a drop (imitation) pearl earring.
    WIN.
    That's a good score and far better than the false tooth I heard about a few months ago.

    someone on this forum (may have been Andy) once commented the same equipment is used to process both corn and coffee.
    Yep, it was me but not process, it was bag/pick/collect...

    Quote Originally Posted by Andy View Post
    I find corn (popped and unpopped) in the cooling tray of the commercial roaster all the time from many different origins.

    I often scratched my head wondering why it was in with the beans then one day my South American broker told me.

    The pickers on the farms will use the same bags (often those woven white plastic bags) to pick corn, fruit, vegies and coffee depending on which picking season it is. Obviously the corn will work its way into the corners of the bags and work its way out on a following crop.

    So as a rule, if you find corn it was the crop prior to coffee in that region.

    Makes sense now why I find corn and why I find the white plastic strands in jute bags.

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    Senior Member chokkidog's Avatar
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    Quote Originally Posted by Vinitasse View Post
    It was about one third full... and I wonder what it would have done when heated to 220 degrees and being tumbled around with my beans.

    And... speaking of MOG... at one of the vineyeards I worked at the mechanical harvester would dump 1.5 blackbirds per tonne into the crusher destemmer... just added to "le gout de la terroir" I guess
    Shhhhh!! Birds nests (used), rats, spiders aplenty, snails. 8-o There's a reason I was never involved with machine harvesting!!

    I think you did extra well in spotting the lighter!!

  17. #17
    Senior Member Yelta's Avatar
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    Quote Originally Posted by Andy View Post
    Yep, it was me but not process, it was bag/pick/collect...
    Almost got it right

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    Quote Originally Posted by Vinitasse View Post
    two days ago I came across a disposable lighter in a bag of AAA grade beans from Tanzania.
    Sometimes we like a lighter roast.

    Barry

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    Senior Member GrahamK's Avatar
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    Found this nasty one in my PNG Wahgi AA just yesterday - reckon it would have done some damage to a grinder. Made a bit of a racket in the roaster, so I was prepared.

    GrahamK
    Attached Images Attached Images

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    Member ASchecter's Avatar
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    Best one I've ever heard about was an unfired 9mm pistol round. Someone saw it and picked it out, otherwise it would have a lively espresso "shot."

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    Super Moderator Javaphile's Avatar
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    Quote Originally Posted by ASchecter View Post
    Best one I've ever heard about was an unfired 9mm pistol round. Someone saw it and picked it out, otherwise it would have a lively espresso "shot."
    The roast heard round the shop!


    Java " " phile
    Toys! I must have new toys!!!

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    CoffeeSnobs Owner Andy's Avatar
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    I just had an email from someone who found a stone in their green beans (before it got to their grinder) and I thought that makes it a good time to bump this thread.

    Here is a current picture of my debris collection from the CoffeeSnobs - BeanBay - Other Stuff - CoffeeSnobs Stainless Steel Coffee Destoner over the last 6 months.

    Stones, concrete, odd looking beans, tree nuts, corn, nails, stainless nut, knife blade etc etc. Nearly time for a new collection jar!

    collection.jpg

    Please remember the bottom of every green bean sticker says:

    NOTE: This is a raw product direct from coffee origin and could contain
    foreign objects that you would prefer not to come in contact with your
    coffee or coffee making equipment. Please process with care.

    It really is true!

  23. #23
    Super Moderator scoota_gal's Avatar
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    You will be able to landscape a garden with that collection soon Andy!

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    CoffeeSnobs Owner Andy's Avatar
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    Considering I paid $10-$40/kg it makes for pretty expensive landscaping!

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    Super Moderator Javaphile's Avatar
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    Use it to make your own Zen garden!


    Java "Ohmmmmmmm...." phile
    Toys! I must have new toys!!!

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    CoffeeSnobs Owner Andy's Avatar
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    Question from email:
    Do you know if a stone would do much damage to a grinder?
    Depends on the stone and the grinder.

    Most of what you find are concrete chips from the drying patios, these will mostly just turn to dust in a good grinder and while they might take the edge off a burr I doubt they would do any amount of real damage.

    Some rocks and objects are much harder... granite, glass, nails etc, these will at best blunt the burrs and if you have a grinder with less torque and flimsy shaft or burr carrier then it could bend the shaft.

    Best bet, don't grind anything except coffee to be sure.

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    I haven't found anything in my greens yet.. But this is a great topic to make sure most are informed to inspect during the roasting and grinding process.

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    Quote Originally Posted by chokkidog View Post
    Shhhhh!! Birds nests (used), rats, spiders aplenty, snails. 8-o There's a reason I was never involved with machine harvesting!!

    I think you did extra well in spotting the lighter!!
    Today we found a perfectly preserved bat in our Tanzanian beans! My boy found it before it went in the roaster.

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    You have more chance of getting something odd like that in a AAA grade than in a B grade coffee.
    Why?
    AAA is all the beans that didnt go through the largest #20 screen.
    B grade had to fit through a #20, #19, #18, #17, #16, #15, #14 size screens

    Really? So B grade is better/cleaner than AAA grade? Or AAA is a reference only to the size of beans?

  30. #30
    Senior Member chokkidog's Avatar
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    As Robin would have said...

    Holy Bat Trap!
    Holy Nick Of Time!

    (genuine quotes http://en.wikipedia.org/wiki/List_of...tions_by_Robin )
    Last edited by chokkidog; 2nd April 2014 at 07:14 PM. Reason: add source

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    Senior Member speleomike's Avatar
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    Hi all

    I have a small pyroclastic rock from the Arenal volcano which was in my Costa Rican Tarrazu some years ago. (see post http://coffeesnobs.com.au/grinders/2...s-grinder.html and search for Arenal)

    Mike

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    I had one bag of coffee that had about 15 stones in it perhaps I was neat the bottom.

    the first stone made a lot of noise in the grinder.

    the rest if the coffee has been good.

    Silly me thought Andy put the warning on the bag just to keep his risk adverse lawyers happy

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    Was at a conference this past weekend, there was an Expobar Minore IV and Smart Grinder prepared to make some quality coffee. About half an hour in, the grinder jammed up. We checked it out and found this jammed in there:



    Which resulted in this:



    Didn't have time or the tools to fix it when we were there so unfortunately we missed out on the coffee over the weekend. Conveniently I had a spare Breville BES860 at my shop which uses the same gearbox as the Smart Grinder. Swapped the new gear in and it's working well. Burrs took no damage from the stone luckily.

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    Senior Member artman's Avatar
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    I thought the SG has a clutch so if it jams the motor stutters away like a driver drill on screw setting? I have witnessed mine do it with very under roasted beans a couple of times.

    Cheers

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    Quote Originally Posted by artman View Post
    I thought the SG has a clutch so if it jams the motor stutters away like a driver drill on screw setting? I have witnessed mine do it with very under roasted beans a couple of times.

    Cheers
    No clutch, just 2 nylon gears driven straight off the motor. This was one of the earlier Smart Grinders though so perhaps in the later ones they added the clutch feature.

  36. #36
    Senior Member artman's Avatar
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    Hmmm interesting. Mine is one of the early ones. Maybe the ratcheting sound is the gears slipping/jumping?

    Cheers

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    Generally under-roasted beans should be the same, if not easier to grind that standard or dark roasted beans. Less work for the burrs to have to do as the bean is less firm/crispy/solid (not sure what word describes this characteristic).
    I think if the gears were slipping or separating there would be something seriously wrong and the grinder wouldn't be working properly at any time. There's basically no room for movement inside the gearbox. If the motor shaft slips on the nylon gear it's going to chew away at it really quickly and something similar to my photo is going to happen. I don't think the nylon gear to gear mesh would slip either.

    A sound might come from the sweeper arm as it is attached to the same shaft as the final drive gear and burr, it has some washers and stuff around it. If the under roasted beans are remaining clogged in the sweeper chamber (as they still may contain some moisture) then it might be causing it to struggle. I would have thought it could handle it though. I might try out a comparison of roasts on my smart grinder at work, although it is one of the newer ones.

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    TC
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    Really? Not according to my hand grinder (or my teeth for that matter)....
    chokkidog and Vinitasse like this.

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    Senior Member chokkidog's Avatar
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    Quote Originally Posted by noidle22 View Post
    Generally under-roasted beans should be the same, if not easier to grind that standard or dark roasted beans. Less work for the burrs to have to do as the bean is less firm/crispy/solid .
    The more developed the roast, the more the cellulose matrix of the bean becomes stretched, sometimes a little ruptured, so the more brittle it becomes.

    The lighter the roast, the more plastic the cell structure remains.

    The darker the roast the more easily the bean will shatter.
    Vinitasse likes this.

  40. #40
    Senior Member artman's Avatar
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    Yeah not sure what it was, happened once or twice ages ago and the grinder has been grinding the same pre and post event. A few other people have mentioned the same noise on the SG thread a while back.

    Cheers

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    TC
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    Hooked a beauty today. Would have killed a grinder for sure...

    Andy- our CS destoner saves my butt each week!
    metalandstones.jpg

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    Coffee+carbon=heaven Mono's Avatar
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    Yep, that is a ripper........... and "ouch" what a potential disaster for someone had it gotten through.

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    Life-long Learner DesigningByCoffee's Avatar
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    Quote Originally Posted by Talk_Coffee View Post
    Hooked a beauty today. Would have killed a grinder for sure...

    Andy- our CS destoner saves my butt each week!
    metalandstones.jpg
    Were all those stones in the same batch as well?
    My little DIY destoner has already caught 4 stones - but that pic looks like a road base stockpile!

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    Quote Originally Posted by DesigningByCoffee View Post
    Were all those stones in the same batch as well?
    My little DIY destoner has already caught 4 stones - but that pic looks like a road base stockpile!
    No- plenty of roasts in that. It's probably 3 weeks of destoner action there....

    Chris

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    Life-long Learner DesigningByCoffee's Avatar
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    Ahhhh that makes more sense! Finally got around to the 'filter clean' I'm guessing…!

    Impressive looking collection nonetheless. I'm always intrigued though, why there is always a bean or two that don't seem to want to fly, when the rest do it so easily…

  46. #46
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    The beans/stones go to the catch tray. The filter gets the dust

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    A bit of FAIRTRADE organic concrete.
    Safe to say I spotted before it hit the roaster
    Attached Images Attached Images

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    Life-long Learner DesigningByCoffee's Avatar
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    This one was spotted in the cooler - didn't even get to the destoner!

    DBC-Stone-Catch.jpg

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    Sticks, stones and other items...

    Do you sort through your beans to make sure there are no sticks, stones or other items that you don't want in your grinder?
    If you do, did you ever find anything - or have you had the misfortune that your grinder found it first?

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    Quote Originally Posted by knastoer View Post
    Do you sort through your beans to make sure there are no sticks, stones or other items that you don't want in your grinder?
    If you do, did you ever find anything - or have you had the misfortune that your grinder found it first?
    Damn... I really did search for a thread like this before starting a new one. Sorry!

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