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Thread: Play in Rockys burr carrier thread

  1. #1
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    Play in Rockys burr carrier thread

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Just noticed some lateral movement of rockys hopper, difficult to measure but finger pressure on top of the hopper is showing about 1 mil maybe a bit more of lateral movement, grinder is getting on to 3 months old, never noticed it before but never looked for it either, just thought everything is fine as the hopper does not shake in use.
    I dont know how much movement is within the manufacturers tolerance, can any one advise, or maybe post how much there rocky has using gentle finger pressure.
    Not sure which way to go with it, send it back and be without it for 2 or 3 weeks maybe to be told it is within spec.
    Do the teflon tape mod, or my current fix of resting my spare hand on the lid with a bit of downward pressure.

  2. #2
    Mal Dimal's Avatar
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    Re: Play in Rockys burr carrier thread

    Gday vr,

    Just checked on my Rocky and to be honest, there doesnt appear to be any lateral "play" as such but there is a little play within the step position locator, not enough to worry about though. I guess if youre worried about it it might pay to contact the vendor you bought it from to see if they can check a couple of new Rockys they have on hand and report back to you.

    Pushing on the top rim of the hopper is probably not the best way to measure this though as you would be getting some pivoting action around the centre of the thread exacerbating the apparent movement. Would be better to apply slight pressure opposite the direction you want to measure the play and then push the top burr-carrier towards that side and measure the play resulting from that. Hope thats clearer than mud vr :-?,

    Mal.

  3. #3
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    Re: Play in Rockys burr carrier thread

    Rockin rocky has now been tefloned. Ill see how that goes. Man that thing is solid inside.

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    Re: Play in Rockys burr carrier thread

    Update
    The teflon tape mod has made a big difference. Hopper adjustment feels smooth and damped, rockin rocky now has no thread slop. It sounds better, more precise in use. French press coffee has a cleaner taste with less mud in the bottom, indicating a more consistent grind.
    My dilemma is, do I take out the tape and return it to the retailer who will then send it back to the distributor who may deem it to be within tolerance or repair it, if repaired would it be as good as I am now getting, it may come back tighter, but to tight to take the tape mod if needed. I have spoken to a person at the distributor, who didnt understand what what was wrong and said stuff like "you havent had it apart have you" and "it still grinds dosent it".
    Or do I keep it as is and replace the tape from time to time when I pull it apart to clean the burrs.

  5. #5
    Mal Dimal's Avatar
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    Re: Play in Rockys burr carrier thread

    Hmmm,

    Lot to be said for dealing with highly reputable establishments I guess, cant imagine a Site Sponsor leaving you dangling in the wind like this.....

    If it was me, Id try and have the Rocky replaced, especially if it has only been in your possession for a very short time. I know you shouldnt have to explain this to a vendor worth his/her salt but the fact that the excessive play in your particular Rockys Burr carrier system can be noticed in the quality of shots you produce should be enough to warrant its replacement.

    In the end, I spose its a choice that only you can make :-?.... All the best with which ever way you choose to go,

    Mal.

  6. #6
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    Re: Play in Rockys burr carrier thread

    Rocky is now at the vendors who will return it to the distributor, we compared it to one on display and it has the same tolerance issue as mine. The vendor is doing his bit but it will be up to the Rancilio distributor to fix it or not. I think I may be in for a bit of a battle here to get satisfaction, the thread is clearly cut to loose but I have to convince them of that, dosent help that the average customer wouldnt know the difference and just accepts whats given.
    Damn this forum ignorance is bliss. ::)

  7. #7
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    Re: Play in Rockys burr carrier thread

    Quote Originally Posted by Mal link=1182672500/0#4 date=1183280509
    Hmmm,

    Lot to be said for dealing with highly reputable establishments I guess, cant imagine a Site Sponsor leaving you dangling in the wind like this.....

    If it was me, Id try and have the Rocky replaced, especially if it has only been in your possession for a very short time. I know you shouldnt have to explain this to a vendor worth his/her salt but the fact that the excessive play in your particular Rockys Burr carrier system can be noticed in the quality of shots you produce should be enough to warrant its replacement.

    In the end, I spose its a choice that only you can make :-?.... All the best with which ever way you choose to go,

    Mal.
    Id do the same, a grinder of this stature should be better than that, plus I would insist on a loaner while its being repaired / replaced...... It is the least they should do. Ray. 8-)

  8. #8
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    Re: Play in Rockys burr carrier thread

    This is simply manufacturing tolerance. The brass burr carrier threads cannot have an inteference fit so some clearance is necessary and mass production ensures that there will be variation between Rockys. All stepped grinders with brass burr carrier will be subject to this + wear will increase the clearance and the wobble. Id teflon wrap the upper burr carrier of any grinder of this type.

    Since Mazzers use spring loading to locate the grind position, they dont suffer from this as the springs also stabilise the burrs. Someone here once added preload springs burr to their Cunill Tranquilo to stabilise the upper burr and found an improvement - how easily this can vbe done with other grinders, I dont know.

    The plastic carrier used in the Lux/Iberital/Isomac etc doesnt suffer from this since the plastic threads are a slight interference fit.


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    Re: Play in Rockys burr carrier thread

    " This is simply manufacturing tolerance."
    Yep I agree it is manufacturing tolerance but I believe it is excesive, the amount of slop would be like rotating the adjustment back and forth in use, I did teflon it and the diference in taste is noticeable. It is now up to the distributor to replace the top carrier with a better fitting component or shirk their responsability and return it as is. I have read posts about Rockys burr play, but not recent posts, so had assumed earlier batches were so affected but I was wrong as current runs also suffer.
    Thread slop would also degrade resale value why should I suffer this if other rockys have tighter tolerance.

  10. #10
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    Re: Play in Rockys burr carrier thread

    They may well have to cherry pick amongst their stock to get you a Rocky with tighter tolerance. Id still teflon tape even if the replacement is noticably better as the tighter location will reduce wear of the carriers (a poofteenth, anyway).

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    Re: Play in Rockys burr carrier thread

    Quote Originally Posted by kaanage link=1182672500/0#9 date=1184028396
    They may well have to cherry pick amongst their stock to get you a Rocky with tighter tolerance. Id still teflon tape even if the replacement is noticably better as the tighter location will reduce wear of the carriers (a poofteenth, anyway).
    What was that "poofteenth" or "poopteenth" ;D ::)

  12. #12
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    Re: Play in Rockys burr carrier thread

    Rocky has returned the same as he went away. The distributors doctor deemed him, a fit healthy little rocky, nothing wrong with him they say. The diagnosis hasnt soured our relationship, hes such a robust little fellow, he looks like he will last forever, I dont mind adding a bit of teflon tape to help him achieve his goals in life. Wish I knew what the specs were though just for peace of mind.

  13. #13
    Mal Dimal's Avatar
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    Re: Play in Rockys burr carrier thread

    Gday vr,

    A bit frustrating in some ways I guess :-/ but as you say, the inherent build quality is there and the addition of a small amount of plumbers tape will soon take care of the excess play in the thread. All the best mate and many happy brews ahead :),

    Mal.



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