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  • Mazzer mini -- burrs need replacing?

    As some may know, I recently had reason to be looking into the innards of my MM :

    And of course this was a wonderful opportunity to clean inside & out, after which I could get a good look at the burrs.

    They looked sortof shiny, and fairly smooth, which new burrs apparently dont, and arent, but apart from that how would I tell if they need replacing?

    I do get a little "mud" at the bottom of a plunger coffee -- does that mean anything?

    Is there a mazzer distributor in Melbourne who sells actual genuine mazzer parts?

    Thanx in advance for any answers to this little sequence of Qs 8-)

  • #2
    Re: Mazzer mini -- burrs need replacing?

    Originally posted by simone link=1218968002/0#0 date=1218968002
    As some may know, I recently had reason to be looking into the innards of my MM  :

    And of course this was a wonderful opportunity to clean inside & out, after which I could get a good look at the burrs.

    They looked sortof shiny, and fairly smooth, which new burrs apparently dont, and arent, but apart from that how would I tell if they need replacing?

    I do get a little "mud" at the bottom of a plunger coffee -- does that mean anything?

    Is there a mazzer distributor in Melbourne who sells actual genuine mazzer parts?

    Thanx in advance for any answers to this little sequence of Qs  8-)
    If the burr edges are rounded,

    Id be inclined to change them Simone,

    Coffeeparts will be able to assist. Alternately, I have to collect some grinders in the next day or two and can grab some for you...

    regards

    Chris

    Comment


    • #3
      Re: Mazzer mini -- burrs need replacing?

      Originally posted by simone link=1218968002/0#0 date=1218968002
      They looked sortof shiny, and fairly smooth, which new burrs apparently dont, and arent, but apart from that how would I tell if they need replacing?
      Basically, if you drag a fingernail against the burr edges, they should be sharp enough to shave a thin sliver from the nail (especially near the perimeter where the true grinding takes place). You can also tell, with the aid of a magnifying lamp, that the edges are no longer straight when looking from the perimeter towards the centre, especially the outside third of their length. If the burrs are particularly worn, you can even see the beginnings of a rounded or chamfered edge on all the individual cutting edges.
      Theres a couple of threads somewhere about this topic with photos so a search might turn up something. :-?

      All the best,
      Mal.

      Comment


      • #4
        Re: Mazzer mini -- burrs need replacing?

        Darn -- I ran my finger over them without losing any skin; didnt think to try the fingernail trick

        Comment


        • #5
          Re: Mazzer mini -- burrs need replacing?

          Originally posted by 2muchcoffeeman link=1218968002/0#1 date=1218974585
          Alternately, I have to collect some grinders in the next day or two and can grab some for you...

          regards

          Chris
          Hi Chris,

          this sounds like an excellent plan -- thanks!

          Though Id better ask how much these will set me back before I get completely carried away :

          Comment


          • #6
            Re: Mazzer mini -- burrs need replacing?

            Hi Simone,

            Coffeeparts has the burrs at circa $60 + post...

            Chris

            Comment


            • #7
              Re: Mazzer mini -- burrs need replacing?

              Hi Chris,

              yes, I shouldve included them in my previous "bulk" order -- just not thinking ahead >

              So if I could pick them up from you that would be cool 8-)
              -- otherwise will wait til I need a few more things...

              Is there really no one in Melbourne who sell parts?

              Comment


              • #8
                Re: Mazzer mini -- burrs need replacing?

                Gday Simone...

                Managed to find a couple of photos of worn burr-plates; the first one is the Static Burr, the second is the Rotating Burr.

                You can see the wear patterns on the cutting edges I mentioned before and how the edges have developed a rounded or chamfered appearance. Dont know if yours will be as bad as this but at least it gives you a bit of an idea.

                All the best,
                Mal.



                Comment


                • #9
                  Re: Mazzer mini -- burrs need replacing?

                  Hi Mal,

                  thanks for the pix! Ive trying to compare them to the photos I took of mine -- this would work a lot better if I had taken my photos after I cleaned up, rather than before! Duh. But they do look rather similar... And on the 1 shot that was well-enough focussed to get a really close look, some of the edges look sortof, um, battered? :-/

                  So think itd definitely be interesting to give new burrs a go, just to see

                  Comment


                  • #10
                    Re: Mazzer mini -- burrs need replacing?

                    Well, new burrs are in no problems -- thanks Chris for burrs + advice

                    The screwdriver in the throat trick is a goodun, even if we did use a bit of kindling out of the wood basket instead :

                    New burrs to my untrained eye look much like old burrs; feel rougher tho, and better at shaving fingernails.

                    Tomorrow well see what they do to coffee beans!

                    Comment


                    • #11
                      Re: Mazzer mini -- burrs need replacing?

                      Got an update for us Simone? How are the new burrs going?

                      Comment


                      • #12
                        Re: Mazzer mini -- burrs need replacing?

                        Gee -- has it been nearly a week!?

                        Well, the 1st couple of days were a little confusing. I did realise that I would have to adjust my grind, but it seemed to take a while to "settle". Though hindsight sez all those little crevices that I so carefully cleaned out were going to need to fill up again, so those of us who follow the "weigh x grams of beans and throw in grinder" approach to dosing are going to be in a spot of bother.

                        There did seem to be "fines" in the bottom of my cup the 1st few times, but not now.

                        We took some macro photos of the new burrs to compare with shots of used burrs, but the only thing they really showed was that the new burrs had surface rust. Dont know if this is "normal", but expect its all in me now anyway :P

                        (iron in the diet is good, right?)

                        But now the crevices are filled up and the grinders settled down, I cant say Ive really noticed a lot of difference to my coffee -- Im just not consistent enough with my dose, distribution and tamp, so variation there is probably greater than any "new burrs" effect :-/

                        Oh, except the 15g in double-basket setting is now about 3 notches coarser. Now wondering -- is this a lot, or about what I should expect?

                        Comment


                        • #13
                          Re: Mazzer mini -- burrs need replacing?

                          Sorry to open an old thread that probably has been answered before, but I couldnt find the answer I was looking for.

                          Originally posted by 6F42464A472B0 link=1218968002/2#2 date=1218976102
                          Basically, if you drag a fingernail against the burr edges, they should be sharp enough to shave a thin sliver from the nail (especially near the perimeter where the true grinding takes place).
                          When you say "near the perimeter" Im guessing you mean the red arrow as apposed to the blue arrow?

                          When I scrape my nail on the outer edge as in the second pic theres no resistance and no shaving of the nail, but when I scrape in the middle as in the third pic it will take off very slight slices of nail.

                          So is that outside edge the important one and therefore I should change the burrs? Its just that Ive taken it to few barista friends and some parts shops and Ive been given conflicting advice on whether theyre gone or not - so Im a little confused.

                          Also, how long does it take to run the burrs in until theyre consistent? I saw this thread http://coffeesnobs.com.au/YaBB.pl?num=1325840899/22 showing the jagged edges on the burrs and saying it can take around 4000 shots, or around 80 kgs before they were run in. Granted thats a robur and im assuming a SJ would be less, but any ideas on how much?

                          Thanks





                          Comment


                          • #14
                            Re: Mazzer mini -- burrs need replacing?

                            Yep the outer edge is the fine grinding section and will have the biggest effect on the performance of the burrs if its worn.

                            I use the flat of my thumb to check this area, if there is enough of an edge to grab and stop your thumb sliding across the surface, I would consider the burr to be OK.

                            Flat burrs are less complex to machine and seem (from the ones Ive looked at really closely) to have better quality edges. Theres still bits and pieces that will come off in the first kilo of coffee, but I seriously doubt it would take more than a few kilos for a 64mm flat burr to be well and truly up to speed.

                            Comment


                            • #15
                              Re: Mazzer mini -- burrs need replacing?

                              Awesome - thanks Rick!
                              The ones that Coffee Parts have on their site for $47.50 - are they genuine Mazzer burrs?

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