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Thread: Couple of Rocky questions

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    Couple of Rocky questions

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I bought a second hand rocky from a forum member. I took it to Di Bartoli to get it cleaned and checked over. They told me the burrs showed signs of wear. Its less than a year old and was only used on weekends for about 6 months by the previous owner.

    Im just wondering what people think of this? Do burrs sometimes wear more quickly? Could Di Bartoli have been wrong?

    Anyway, my plan is to keep using it and see how it goes. What signs of burr wear should I look out for (apart from taking it apart)?

  2. #2
    A_M
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    Re: Couple of Rocky questions

    Define signs of wear ?

    That is a given to me... Once a system has been used....

    If used for decaf then even more so..

    Looks Well worn; would be more of a concern ;)

    Totally Dull or blunt or Stuffed would different again..

    It is not like there is a defined scale when one can look it up and say yep...That is a 3.75 grade out of a 5.00 ;)

    I have seen some burrs last for ever and other get dull much sooner than expected... But ask any Sponsor to provide full warranty on the burrs for ware... They are a consumable and cheep to replace...

    If they fell apart or fractured for no reason... I am sure most sponsors would have a close look and may come to teh party if a manufactures issue... .

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    Sleep is overrated Thundergod's Avatar
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    Re: Couple of Rocky questions

    Quote Originally Posted by 716667716A606B31333333030 link=1284769736/0#0 date=1284769736
    Could Di Bartoli have been wrong?
    I doubt it.

    Quote Originally Posted by 716667716A606B31333333030 link=1284769736/0#0 date=1284769736
    They told me the burrs showed signs of wear.
    Id have asked for more detail.
    Give them a call.

  4. #4
    Senior Member Yelta's Avatar
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    Re: Couple of Rocky questions

    Quote Originally Posted by 0D222B293E012D222D2B29212922384C0 link=1284769736/1#1 date=1284772794
    I have seen some burrs last for ever and other get dull much sooner than expected...
    My original set of Rocky burrs lasted almost 7 years, eventually replaced them with a set of aftermarket burrs (they were a few dollars cheaper) these lasted about 6 months, replaced them with another set of non genuine burrs which also lasted about 6 months >:( So replaced them with a set of genuine Rancilio burrs from Jetblack Espresso, these were still going strong when I sold the machine about 12 months later. ;)

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    A_M
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    Re: Couple of Rocky questions

    Quote Originally Posted by 1B272E3623420 link=1284769736/3#3 date=1284777399
    My original set of Rocky burrs lasted almost 7 years
    And
    Quote Originally Posted by 302726302B212A70727272420 link=1284769736/0#0 date=1284769736
    Its less than a year old and was only used on weekends for about 6 months by the previous owner.
    Thus - I would expect the burrs to be OK..

    But would still show some sings of being used..

    TG.. Has it in one
    Quote Originally Posted by 162A372C262730252D26420 link=1284769736/2#2 date=1284776981
    redrich2000 wrote on Today at 10:28:
    They told me the burrs showed signs of wear.
    Id have asked for more detail.
    Give them a call.

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    Re: Couple of Rocky questions

    Just bumping this thread up. So I am having difficult getting the grinder to grind fine enough for my mypressi twist. I have it set about 3 clicks above zero and the twist pours a double in about 10 secs. Over the weekend Ive been using my hario hand grinder and it has the twist pouring nicely at about 25 seconds.

    Would that indicate that the burrs need replacing on the Rocky or some other problem?

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    Senior Member GregWormald's Avatar
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    Re: Couple of Rocky questions

    The indicated zero point on Rockys is notoriously inaccurate. Dial it down a click or two and see how that goes.

    STOP if you hear the burrs touching--metal on metal should be easy to pick.

    If dialling down doesnt work then a disassembly to check on the zero point indicator would be my next step.

    Greg

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    Re: Couple of Rocky questions

    Worn burrs dont always mean you cant get a fine particle grind, but they are just one indicator that should be investigated.

    Worn burrs are generally detected by heat around the burr casing and/or an overly burnt smell from ground coffee. Worn burrs will also result in the ground coffee being warm to hot, depending upon how much you grind in a short time.

    The burrs should last anywhere from 300 - 500 kilos, depending upon the grind level and whether they were "genuine" parts.

    De-caffe doesnt necessarily mean the burrs wear quicker - de-caffe can sometimes have higher oil levels, but the oils dont materially contribute to faster blunting - certainly not in the same way grinding high-grown hard centrals like a SHB Costa Rica versus a softer Brazil or Colombian.

    Commercial roasters typically budget 400 - 600kg between burr replacement, depending upon the brand of grinder and the workload. Obviously, domestic grinders are a bit below this, but Id expect genuine Rocky burrs to go at least 200+ kgs.

    If you are really concerned, try opening up the burr housing and inspecting yourself or grinding 100g+ in one straight run and detecting any overly warm "bits" (some warm bits are normal if doing 100+ grams).

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    Re: Couple of Rocky questions

    The grinder went into di bartoli after I bought it so I would hope its set right. Also, when it gets to the zero mark it feels tight, like it wont go any further.

    The grinder is only a year old and was only used for about 6 months by the previous owner. Di Bartoli said there were signs of wear on the burrs but not enough that they needed replacing. I dont feel confident taking it apart or in assessing it myself. Im at a bit of a loss.

  10. #10
    Senior Member GregWormald's Avatar
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    Re: Couple of Rocky questions

    If you cant get it right just by dialling it down, and you dont feel confident disassembling it, then see if you can take it in and have a lesson on both use and cleaning level disassembly. They can easily check it at the same time.

    Greg

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    A_M
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    Re: Couple of Rocky questions

    Quote Originally Posted by 695C4B4979415C434F424A2E0 link=1284769736/9#9 date=1286155269
    If you cant get it right just by dialling it down, and you dont feel confident disassembling it, then see if you can take it in and have a lesson on both use and cleaning level disassembly. They can easily check it at the same time.

    Greg
    AND

    Quote Originally Posted by 5C4B4A5C474D461C1E1E1E2E0 link=1284769736/8#8 date=1286154172
    The grinder went into di bartoli after I bought it so I would hope its set right. Also, when it gets to the zero mark it feels tight, like it wont go any further.

    The grinder is only a year old and was only used for about 6 months by the previous owner. Di Bartoli said there were signs of wear on the burrs but not enough that they needed replacing. I dont feel confident taking it apart or in assessing it myself. Im at a bit of a loss.

    The issue can also be that teh stop is not at true ZERO.

    If at true zero the outer lip of teh burrs with touch and you will hear a soft metal on metal sound as it is spinning.

    Thus you might be an extra few clicks from true Zero and that could mean that you 1 click away for teh crind size you want.

    See if teh following is available, Di Bartoli are focused on client support ad should be able to sort you out...

    Quote Originally Posted by 695C4B4979415C434F424A2E0 link=1284769736/9#9 date=1286155269
    then see if you can take it in and have a lesson on both use and cleaning level disassembly.



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    Re: Couple of Rocky questions

    Is it possible the fast pour is being caused by the clumping the Rocky produces?

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    Re: Couple of Rocky questions

    Quote Originally Posted by 342322342F252E74767676460 link=1284769736/11#11 date=1286156743
    Is it possible the fast pour is being caused by the clumping the Rocky produces?
    Doubt it.. Any reasonable tamp gets rid of clumping..

    Fast pour is either STALE beans or TOO course a grind or Too light a tamp.

    My rocky was a balance between *Grind and Tamp - but then I roasts a bit - so fresh beans was not the problem :-)

    Clumping Vs whats in the cup... *I reckon there would be only a few in the world that could even come close to picking and then only if the clumping was severe (too fine a grind/static/oily) - if done blind *:o

    Regardless of the clumping or not it is more the consistency of the dose and tamp that is the real issues as to what in the cup.. * Clumping and others are just artefacts that start people off on applying some rigour to their own processes. * Then the bow is drawn and clumping get blamed.. Yet if ya ask me... The users processes and consistence is the main issue.

    Just watch some of big comps.. I see clumping etc at time... *But do you see some one spending 10 min to mix with a ss rod, and then knock and then dose some more and then use a calibrated card to sweep and then have 3 goes to tamp and knock..

    KISS. * G

    Grind, dose, settle, dose and tamp smoothly AND at the right volume/Level to ensure the shower screen does not distroy ya hard work..


    KISS - *When a bird sh!ts in ya back yard... Dont go looking for a rare bobo bird that every one talks about, but has never seen. *Look for a sparrow ;D

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    Re: Couple of Rocky questions

    Quote Originally Posted by 6374756378727923212121110 link=1284769736/8#8 date=1286154172
    The grinder went into di bartoli after I bought it so I would hope its set right. Also, when it gets to the zero mark it feels tight, like it wont go any further.

    The grinder is only a year old and was only used for about 6 months by the previous owner. Di Bartoli said there were signs of wear on the burrs but not enough that they needed replacing. I dont feel confident taking it apart or in assessing it myself. Im at a bit of a loss.

    Try adjusting either while the grinder is completely empty or while it is grinding, otherwise youll have a whole lot of coffee in the way of the burrs getting closer to each other

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    Re: Couple of Rocky questions

    Quote Originally Posted by 72564C5C575E3F0 link=1284769736/13#13 date=1286175717
    Try adjusting either while the grinder is completely empty or while it is grinding, otherwise youll have a whole lot of coffee in the way of the burrs getting closer to each other
    If he is not happy to play - Then a Sponsor is the way to go.. (And he should be commended for sticking to his guns).

    If assistance is what is needed, then :- In the Grinder section there is a full topic all featured on adjusting the Rocky.. *Pics / link / warnings and tricks...

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    Re: Couple of Rocky questions

    Not sure if its mentioned - are you dosing enough coffee into the portafilter ?

    Even if you have fresh beans and a fine grind, unless to dose sufficient it may pour too quickly.

    Try overfilling the portafilter and working backwards from there.



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