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Thread: Mazzer mini -- burrs need replacing?

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    sdg
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    Mazzer mini -- burrs need replacing?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    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-)

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    Re: Mazzer mini -- burrs need replacing?

    Quote 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

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    Re: Mazzer mini -- burrs need replacing?

    Quote 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.

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    Re: Mazzer mini -- burrs need replacing?

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

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    Re: Mazzer mini -- burrs need replacing?

    Quote 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 ::)

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    Re: Mazzer mini -- burrs need replacing?

    Hi Simone,

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

    Chris

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    sdg
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    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?


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    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.




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    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 :)

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    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!

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    Senior Member javabeen's Avatar
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    Re: Mazzer mini -- burrs need replacing?

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

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    Re: Mazzer mini -- burrs need replacing?

    Gee -- has it been nearly a week!? :o

    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?

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    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.

    Quote 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






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    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.

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    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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    Re: Mazzer mini -- burrs need replacing?

    Always subject to correction from more knowledgeable people, but I doubt you will find any grinder manufacturers actually manufacturing their own plates / burrs. The burrs are more likely to come from a subcontracting company that specialisies in burrs.....for lots of manufacturers. So whether a set of plates / burrs has a grinder brand name stamped on or not probably doesnt have much to do with whether the burrs are "genuine" as in if they were actually made by the grinder manufacturer. I would be more concerned they are genuinely european made rather than say, chinese made, in fact we get blurb from grinder manufacturers in china that advertise the grinding plates they use are Italian made! I have never fitted a set of grinding plates / burrs that didnt do the job well, whether they came direct from the grinder manufacturers spare parts, or from a third party supplier, as long as the order specified that the plates should be of a quality atleast equal to the "original fitment". There are different grade burrs available depending on type of material and hardening process used, and what a client fits is entirely up to him and his budget. After that, you probably wont find a difference in the quality of the grinds, rather how long they last in terms of volume beans put through the grinder before the plates need to be replaced again. Will an 80 dollar set of plates last longer than a 50 dollar set? Who knows, you will only know if you have kept track of the quantity of beans put through 2 identical grinders running identical blend coffee through the two different sets of* plates to the point where they are considered worn out* ;)* And if it is in home use, you will never know because you wont wear out a set of these plates in home use in somewhere around 25 years at say 300 grams a week average use!

    Hope that helps.



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