Results 1 to 11 of 11

Thread: IS MY ROCKY A DUD?

  1. #1
    Senior Member ozscott's Avatar
    Join Date
    Jun 2006
    Location
    BRISBANE
    Posts
    1,998

    IS MY ROCKY A DUD?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I just purchased one...nice bit of kit. Also bought the standard euro size baskets to fit the PF - smaller than the original which is way to big - see Alan Frews article.

    I told the guy at the coffee shop that I had the Sunbeam twin TB and he suggested setting the grinder on level 13 to start with - did that and tamped hard - looked way to rough to me. Sure enough massive under extraction both visually and on the pressure guage. No crema and bitter.

    Ok...half a KG of beans later...down to the second finest setting - great. Middle of yellow on pressure guage...correct time - ie 25 seconds to a bit of blonding and good crema - about 4mm on top. I then went for level 1 and same tamp...did not comletely stall the machine by any means but took too long to extract...still very brown after 25 seconds and slow...slow particularly at commencment of poor. In all cases I used the same dose and tamp. I am happy with the results, but concerned that I am on level 2!! Is that normal?

    Cheers

  2. #2
    Mal Dimal's Avatar
    Join Date
    Oct 2004
    Location
    Warwick, QLD
    Posts
    16,768

    Re: IS MY ROCKY A DUD?

    Gday ozscott,

    Its not really very useful as a means of comparison since the "true" Zero of one Rocky compared to another can vary quite a bit..... For example, my Rocky actually zeros at an indicated setting of -3, so my usual grind setting of 14 (+/-1) is actually 17 from true zero. You might find that your Rockys true zero is actually quite a few more points on the minus side of the scale than mine is but theres nothing to worry about as its only really meant as a comparative guide for you to use when making day to day adjustments when compensating for using different beans, changing ambient conditions, etc.

    So long as you can control the pour rate through the PF and the brew tastes great, that is the main thing. All the best,

    Mal.

  3. #3
    Senior Member ozscott's Avatar
    Join Date
    Jun 2006
    Location
    BRISBANE
    Posts
    1,998

    Re: IS MY ROCKY A DUD?

    THANKS Mal - its very close this one. The hopper will turn to true zero at one below zero - ie "2" is actually 3.

  4. #4
    .
    Join Date
    Aug 2004
    Posts
    2,312

    Re: IS MY ROCKY A DUD?

    The advice you were given was good...whilst there is variation from grinder to grinder, most end up somewhere between say 15 ish and 9 ish in my experience......

    After that, its anybodies guess but I am suspicious of a grind of number 2 where the plates rub together somewhere in the vicinity of zero. This is simply far too fine and will produce a coffee with burnt or far too strong character due to "over" grinding / too much quantity of fines in the grinds & spells *way over extraction. Usually, a grind this fine means the operator has used less than the correct quantity of grinds in the filter (under dosed)...and therefore compensated for this by "over grinding" to slow up the rate of pour.

    Duration of pour (as in "25 ml in 25 seconds" etc) is a guide rather than a "definitive" to be followed to the letter, and of course it assumes otherwise all correct technique. But extrapolating from the above paragraph, you can still get "25....in 25....." even if using incorrect technqiue except that the wet coffee will have a totally different character than the one that it might / should have been. Your very brown crema may well be indicative of this, and I always look for a golden/tan crema.

    In any case if this is producing "wet" coffee you are happy with, using the beans of your choice, then I guess that is all that matters in the end.


    Regardz,
    FC.

  5. #5
    Senior Member ozscott's Avatar
    Join Date
    Jun 2006
    Location
    BRISBANE
    Posts
    1,998

    Re: IS MY ROCKY A DUD?

    Thanks mate...just dialed it back to 8 (actual - 9 on the sticker). I tried upsizing back to the quod shot mega basket that came with the EM6900 - dossed it full and then tamped very hard so that there was about 7-8mm between the top of the puck and the top of the basket. I then expressed on auto for 2 cups - not too bad at all, but still not slow drippy crema - just crema and pressure guage showing about half way into the yellow sector. Took the grinder back a notch again to actual 7 (indicated 8) and same thing, just a bit better crema and slightly slower shot.

    Any thoughts about whether my rocky or my skills might need a change?

    Cheers


  6. #6
    Senior Member ozscott's Avatar
    Join Date
    Jun 2006
    Location
    BRISBANE
    Posts
    1,998

    Re: IS MY ROCKY A DUD?

    I pulled mine apart and cleaned it. Now I understand what everyone is one about. Mine at true zero (when the grinding birs have the faintest of touches when turned on) has an indicated -6 on the dial. So when back together at this point and tuned to 3 indicated, its actually on true 9, which means that mine seems to be operating normally!! Thanksall

  7. #7
    .
    Join Date
    Aug 2004
    Posts
    2,312

    Re: IS MY ROCKY A DUD?

    The idea is to fill the filter to the correct level for the model you are using (it varies with machines). It doesnt matter which filter you use the principle is always the same...fill the filter. If you dont the principle of espresso wont work.

    By "Fill", I mean it has to be at a level that is at the same level as the shower ( the plate through which the brew water is distributed) after tamping. This ensures that when the water comes through the shower, it cant just push the grinds out of the way and produce an incomplete, and fast, underextracted pour.

    You cant set the grind until you know what "full" is.

    Fill the filter to above the top of the rim with loose grinds, tamp down, apply it to the group (wipe the group first to ensure it is dry so the grinds dont stick to it), then remove it (without brewing) and see if you can see the imprint of the shower screen on the coffee. Keep trying with various amounts of grinds in the filter until you get to a point where there is just the "kiss" of the shower imprint on the top oif the grinds.....Thats it. from that point on, always fill to the same level.

    From there...you can work out the right grind for those beans, for that filter, on that machine.

    Use regular size commercial filters please, not those silly over-over-over-over size things or you could end up in hospital with a very bad caffeine overdose that could keep you off coffee for months.

    Regardz,
    FC.

  8. #8
    .
    Join Date
    Aug 2004
    Posts
    2,312

    Re: IS MY ROCKY A DUD?

    Ok you just posted your last entry about a minute before I posted the above. Good.

    FC.

  9. #9
    Senior Member ozscott's Avatar
    Join Date
    Jun 2006
    Location
    BRISBANE
    Posts
    1,998

    Re: IS MY ROCKY A DUD?

    Thanks for that advice FC. Followed it to a T. Reverted to standard basket for double shot. Ground to fill, smoothed, tamped ground to fill again, tamped, placed in head. Pulled out - examined - seal and screw marks faintly but definately evident. Grinder was on true 9 from true zero. Hit the auto button for a double shot. Went a little over time at 35 seconds and fantasitc to look at. They must have finally calibrated the guages in the EM6900 properly because it held nicely right on the top part of the brown mark (ie top of the reccomended).

    Tasted BRILLIANT as an espresso. I then made my best microfoam whole milk since i got it - followed the wand near the centre trick and struggled to keep lifting fast enough!! Doubled size (used ice cold stainless container).

    Taste for a cap - Brilliant. No sugar tastes like my normal order in a caf with 2 sugars. My wife thinks Im brilliant which makes the purchase of all this gear cheap..

    Thanks again

  10. #10
    .
    Join Date
    Aug 2004
    Posts
    2,312

    Re: IS MY ROCKY A DUD?

    Great...now overfill the filter slightly ie so that you get a heavy or heavier mark from the shower screen on top of the tamped grinds, but obviously not so full that the handle cant be applied to the group. You might have to back the grinder off sligthly ( ie go to a sligfhtly more coarse setting) so as not to choke it all up during the pour.

    That should make your espresso exquisite but be aware that overfilling over an extended period might damage something.

    Enjoy.

    Chiz,
    FC.

  11. #11
    Senior Member ozscott's Avatar
    Join Date
    Jun 2006
    Location
    BRISBANE
    Posts
    1,998

    Re: IS MY ROCKY A DUD?

    Behmor Brazen - $249 - Free Freight
    thanks mate - but what do you mean. If I get to exquisite why do I have to pull back to less overdosing... Not sure what you have in mind. I would have to change the grind back to a little finer also? What problems for machine (or do you mean it might damage my stomach!!).



Similar Threads

  1. My new rocky
    By grimac in forum Grinders
    Replies: 8
    Last Post: 15th September 2012, 07:11 PM
  2. Rocky vs K3
    By Pobie in forum Grinders
    Replies: 24
    Last Post: 26th June 2012, 02:38 PM
  3. Is Rocky man enough
    By IRF7 in forum Grinders
    Replies: 7
    Last Post: 4th January 2012, 12:14 PM
  4. I GOT GIVEN A ROCKY!!! :)
    By tysonlt in forum Grinders
    Replies: 17
    Last Post: 22nd April 2009, 12:44 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •