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Thread: Rocky Burr Alignment Problem

  1. #1
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    Rocky Burr Alignment Problem

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi Guys,
    I noticed that when my Rocky was turned down to below 5 on the dial there was a noise that appeared to be the burrs catching. They are not grinding on each other but seem to catch each time the motor turns. This produces a knocking noise and gets worse the finer the grind.
    I took the hopper and the top burr off but when re-assembled there was no improvement.
    After some research on the net Ive seen that a number of others have experienced the same problem with their Rockys.
    Just wondering if anyone has had this problem and if so, is there a fix you can perform? Im expecting to have to take it to Cerebro to be checked out but if there is an easier way around it Id love to know.
    Cheers

  2. #2
    Senior Member fatboy_1999's Avatar
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    Re: Rocky Burr Alignment Problem

    If it is under warranty, let them look at it.
    If not, how long since last cleaned?
    When I do a clean of my Rocky, I follow the instructions from coffeegeek http://www.coffeegeek.com/guides/cleanrocky which has the re-alignment of the burrs as one of the last steps (obviously).
    Essentially, there seems to be a bit of play in the position of proper zero on the Rocky. Mine goes to about -2. If you proper zero happens to be around +4, then there might not be any real issue (apart from the numbers being out of whack).
    If your grind is not fine enough and its making these noises, yes there might be an issue.

  3. #3
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    Re: Rocky Burr Alignment Problem

    Thanks Fatboy,
    The burrs seem to be catching when obtaining the necessary grind. As I regularly change beans, I use anywhere from 2-6. From 5 and up the grinder is whisper quiet (when empty). Below that number and the burrs start to catch. I have only owned it for 6 weeks and it was after its first clean today that I paid more attention to the noise. It had actually done it since day one. With the top off I noticed the burrs slowing down quicker when they were "catching". Being so new it is still under warranty so Ill take it back next week.
    Thanks

  4. #4
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    Re: Rocky Burr Alignment Problem

    Newbean,
    I have just finished cleaning my rocky and concur with fatboy, WRT the zero position. When you screw the top burr in, until it touches the the bottom burr, by hand, spin the bottom burr. Just twist the big silver nut in the middle. If the burrs are touching you shouldnt be able to spin it, so that is zero. Back the top burr off a poofteenth so the bottom burr can spin freely. Fit the hopper, putting the zero mark as close as possible over the arrow on the front.

    I assume that when go to spin the bottom burr, it catches the top burr at one particular point in the revolution? Is it accompanied by a metal on metal clink? This would indicate the burrs are not sitting flat (three screws hold them in place), and if its under warranty, definitely take it back. Though Cerebro should have (usually) tested it before letting it out the door.

    If you were really keen, with the top burr off, spin the bottom burr, to eliminate the possibility of a bearing flat spot ( more of a knock sound). But then again, if its under warranty, ask for a replacement.

    Jon

  5. #5
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    Re: Rocky Burr Alignment Problem

    Fellas, and Newbean.

    By all means take it back to the agent but afraid not much may come of it.

    Many grinders are not perfectly "true" in the sense that if you turn the adjustment down to very close to where the plates will touch, you find they are not totally "true" (in alignment) to each other as you have found...however, in reality this should make very little if any difference to the resulting cuppas you produce and is possibly within a certain "acceptable" tolerance allowed by the manufacturer in production.

    In addition, afraid you will also find that if you are operating /grinding that close to rubbing the plates together (2 to 6 range), that the resulting grind is far far finer than was ever intended and would result in burnt coffee with diabolical flavour when brewed. At that point the coffee is virtually pulverised, scorched due to the friction, and all "balled" up into fine oily clumps.

    Not sure what brewing method you are employing that requires such a fine grind, but the rocky is sold as an "espresso" grinder as matched to rancilio domestic espresso machines and you would normally find the appropriate grind for these, as well as most other pump driven espresso machines, to be somewhere around the 12 to 15 number range (on the adjuster of that grinder) in which case it would never be any where near rubbing the plates together in practice except after a considerable volume of coffee has been ground and the plates have been worn down to virtually useless. This usually requires say, a tonne of coffee or more to have been put through.

    Hope this helps, but it is possible we need more information given the range of grind you are apparently operating in.

    Regardz,
    FC.

  6. #6
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    Re: Rocky Burr Alignment Problem

    Thanks Everyone,
    Ive dropped the grinder in this morning to Cerebos who perform the servicing for Rancilio. When I did speak with them yesterday over the phone they mentioned it may be an alignment issue.
    Im not sure of the true zero for mine as I havent mucked around with it too much. With the grind in the 2-6 range (on the dial) I am getting shots in the 25-30 second range with pretty good crema. Different beans are the reason for the variation.
    Ill let you know the outcome when I get it back!

  7. #7
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    Re: Rocky Burr Alignment Problem

    Newbean,
    Got it back yet? If so, can you share the diagnosis?

    Cheers

    Boris

  8. #8
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    Re: Rocky Burr Alignment Problem

    Hi Boris,
    Got the call yesterday that it will be fixed by Tuesday, 3 weeks all up!
    They have offered to courier it to me which is pretty decent. As soon as it arrives Ill let you know whats been done and how it performs.
    Cheers

  9. #9
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    Re: Rocky Burr Alignment Problem

    Well the sega continues. I expected to receive it Tuesday but got the call Monday arvo it wouldnt be ready till Wednesday. Wednesday came and no delivery. I called up at 5pm to see why and didnt get a call back. When I called *today they advised that because I had taken it apart and hadnt aligned it properly when I put it back together I had to pay $33 for the service. I was not too happy as the problem was there before I took it apart. Of course I couldnt prove it and now I have to pay up. Heres hoping it arrives tomorrow.
    My first visit to Cerebros to have a Silvia service was great. I organised to have the service done while I waited and the guys were really helpful. This time round, not so good. 3 1/2 weeks wait only to have to pay to have the problem fixed. They believe that me taking it apart had led to it being out of alignment, I believe it wasnt aligned correctly at the start.



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