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Thread: Clumping problem in a doserless Rocky

  1. #1
    Senior Member speleomike's Avatar
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    Clumping problem in a doserless Rocky

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all
    Just have a new doserless Rocky Grinder and Im finding the coffee clumps when I dose it into the filter basket. last month I did 4 hours at the Vittoria Coffee College and their ground coffee flowed and easily settled down with a knock to the group handle. Im using "Wolloomooloo" coffee beans fresh from Tobys Estate, at room temperature. The day is humid.

    I did find via searching this sites archive a thread that mentioned clumbping and suggested to look at: http://www.home-barista.com/forums/viewtopic.php?t=292
    But the thread there was really discussing a quite diff grinder.

    What do people do to reduce this clumping? Am I right to blame the humidity?
    Im trying to learn tamping and learn to use my new Silvia that I just got this week.

    Mike

  2. #2
    Mal Dimal's Avatar
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    Re: Clumping problem in a doserless Rocky

    Hiya Mike,

    The clumping tendency is definitely affected by changes in humidity.... lower RH = flows freely (sometimes associated with static problems) and higher RH = the start of clumping. The type of coffee bean, the degree of roast (oily beans) and the grind fineness also affect the tendency to clumping so in the end, it can be due to a combination of all of these factors as to why you experience it with your Rocky D/L.

    I really only experience it with my Rocky when using Oily Beans, as the grind setting I use doesnt change all that much, maybe +/- 2-3 steps max. When clumping does occur, its never really worried me all that much though as after tapping on the bench a couple of times and then tamping down, always get a great brew afterwards and thats the main thing isnt it?

    Maybe just try some different beans or better yet, roast some of your own ;D and see how that goes. I dont think it is really a big deal in the end,

    Cheers,
    Mal.

  3. #3
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    Re: Clumping problem in a doserless Rocky

    I notice some clumping too but it is really just a narrow exit shute on the rocky that I think causes this.

    Nothing to worry about.

    Grant

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    Re: Clumping problem in a doserless Rocky

    Hi Mike

    I wouldnt be too worried about the clumping.
    Are you looking for quite a restricted pour? If so it might be necessary to go into slight clumping territory.
    Doserless grinders, no matter what make, will tend to clump the grinds more than a grinder with a doser. The dosing mechanism breaks up the clumps.
    Many things can cause variations in the nature of ground coffee, old beans, fresh beans, dark roast, lighter roast, humidity et al. Clumped ground coffee might not be ideal for perfect distribution, but a couple of settling taps and a good firm tamp should sort that out for the most part.
    How is your pour?
    Are you choking the Silvia with the clumped grind?
    Its been said ad nauseum but... how does the coffee taste? If clumped grounds makes coffee you like then stick with it.


    -Stephen-


  5. #5
    Senior Member speleomike's Avatar
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    Re: Clumping problem in a doserless Rocky

    Hi all

    Thanks for the feedback. Okies I should not worry then about a little clumping.
    The pour seems OK, Im getting about 25 or 30 ml in 25-30 secs and a mouse tail pour.
    The Woolloomoolloo still tastes a little bitter but its hard to tell as I dont have anything to compare against. Im playing at the moment to get the hand of the thing. Ill make posts about the Silvia in the brewer section.

    Mike

  6. #6
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    Re: Clumping problem in a doserless Rocky

    The 25 ml in 25 seconds rate of pour "rule" is really only a guide and will be subject to the difference in the coffee / blend being used & the miriad other variables in any given situation etc etc etc.

    So if at that rate of pour you are still dissatisfied with the result in the cup, try finer, try coarser, less or more tamping etc and see where you get the best result. You may find the best result in your situation for that blend might end up being a rate of pour of 20 seconds, or 32 seconds or wherever....ultimately it doesnt matter as long as you get a good result (or a result that suits you) in the cup.

    No one should be standing over you with a stop watch, and operators that set the grind with a stop watch are missing the point (and believe me, I have seen some service providers doing just that). ;)

    Regardz,
    FC.

  7. #7
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    Re: Clumping problem in a doserless Rocky

    FC:

    I agree with you wholeheartedly.

    It is a dynamic thing and you really need to watch what is happening during the pour to determine the endpoint.

    It is also machine dependent. The characteristics of some machines mean that longer shots often work better than ristretto type shots.

    As you say there are a number of other variables also but in the end it is the taste that counts.

    Grant



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