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Mazzer Robur uneven grinds?

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  • #16
    Is it still taking 12 seconds to grind 20grams of coffee?

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    • #17
      Originally posted by rackxp View Post
      Is it still taking 12 seconds to grind 20grams of coffee?
      Timing has improved as well, but is not where it should be yet. At a guess I'd say closer to 8-10 seconds for 20 grams. However, I have only been single dosing the grinder, which causes it to grind slower than with a hopper & beans above it. Might test this tonight.

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      • #18
        Did you buy genuine burrs? Are you grinding to fine? That's still too long in my experience. Should be around 4 seconds with new burrs.

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        • #19
          Originally posted by rackxp View Post
          Did you buy genuine burrs? Are you grinding to fine? That's still too long in my experience. Should be around 4 seconds with new burrs.
          Yep and my grind is only as find as it needs to be to produce good shots from the Silvia.
          I'll check the grind speed tonight when the hopper on it and report back

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          • #20
            Could you take a photo of the ground coffee? Could you weigh out a double shot and tell us how long it pours for?

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            • #21
              I am single dosing too and it takes around 10 sec to grind as well (can measure it properly if you like). With hopper it took around 4 sec (3.x) indeed.

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              • #22
                Originally posted by samuellaw178 View Post
                I am single dosing too and it takes around 10 sec to grind as well (can measure it properly if you like). With hopper it took around 4 sec (3.x) indeed.
                This is good to know. At least I'm somewhere in the ballpark

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                • #23
                  Originally posted by rackxp View Post
                  Could you take a photo of the ground coffee? Could you weigh out a double shot and tell us how long it pours for?
                  Certainly can. I'll report back with the details tomorrow (hopefully!)

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                  • #24
                    Originally posted by rackxp View Post
                    Did you buy genuine burrs? Are you grinding to fine? That's still too long in my experience. Should be around 4 seconds with new burrs.
                    I agree - with new burrs there is still something that doesn't sound quite right. I have mine set at around 3.8secs for a 25g triple basket…

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                    • #25
                      Commercial grinders for domestic use may have problems initially. My brand new Kony-e took at least a year before it ground completely clumpless grinds. But now it is perfect and has been so for ~5 years

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                      • #26
                        If your still not having any success. I'm happy to come over and try and help you.
                        (I travel to Brisbane three or four times a week for work)

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                        • #27
                          Didn't get a chance to test last night, so only had a chance for a quick test this morning before work. Will do some more checking tonight.
                          But so far found..... Time to grind 20grams single dosed was 9 seconds. Made my second coffee of the morning shortly after with the hopper on but only about 150 grams of beans in the hopper (I'm also new to the home roasting and haven't quite worked out my timing of when to roast yet!!). The grind time with beans in the hopper was just under 7 seconds for the same volume. So slightly quicker. I think this would probably be even quicker with more grinds in the hopper??
                          First photo is a shot of the grinds and second photo shows ~ 30ml espresso which poured in 26 seconds. The beans are only 4 or 5 days old so I think I'm using them sooner than I should.

                          One thing I've just realised as I type this, is that after single dosing, I always remove the electronic doser chute lid and with a small brush, brush out any grounds I can reach and then purge the grinder. I do this because there seems to be a fair amount of grounds that are in there. I haven't actually tested whether I can taste a difference between doing this or simply leaving the grounds for the next coffee? Any advice on this? I also assume this then plays with the timing of the next shot as there aren't the grounds at the front of the grind path that there would be if I didn't sweep them out?
                          Hope this makes sense.....
                          Anyway, let me know thoughts or if I'm doing anything particularly wrong.
                          Thanks
                          Attached Files

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                          • #28
                            I think if you try using it without single dosing, sweeping or purging - your grind times will come within spec.

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                            • #29
                              Looks fine to me. My dose is 15g for 30-40s extraction.

                              Just measured my timing this morning - my grind time is about 9-11s before I hear the sound starts changing - indication of 95% grind was done. There is normally a bean or two worth of chunks not going through due to popcorning. So at that point, I stop pressing the button and then pulse again (I don't use the single/double button). 100% of the beans will go through then - rather than holding the button for 15-20s continuously in one go.

                              To be honest, it's not worth loading the hopper with 1 kg worth of bean just to get it down to sub 4s grind time - too much wastage. I'm pretty sure if you load more beans, it will get close to 5s, and less when the burrs are broken in further. The Robur is so much quieter compared to ANY grinder I've owned in the past, so it's not really a problem.

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                              • #30
                                Originally posted by samuellaw178 View Post
                                Looks fine to me. My dose is 15g for 30-40s extraction.

                                Just measured my timing this morning - my grind time is about 9-11s before I hear the sound starts changing - indication of 95% grind was done. There is normally a bean or two worth of chunks not going through due to popcorning. So at that point, I stop pressing the button and then pulse again (I don't use the single/double button). 100% of the beans will go through then - rather than holding the button for 15-20s continuously in one go.

                                To be honest, it's not worth loading the hopper with 1 kg worth of bean just to get it down to sub 4s grind time - too much wastage. I'm pretty sure if you load more beans, it will get close to 5s, and less when the burrs are broken in further. The Robur is so much quieter compared to ANY grinder I've owned in the past, so it's not really a problem.
                                Thanks mate. I too only use the manual grind button. Also gives me a chance to lightly tap the portafilter to settle 80% of grounds before grinding the rest in. I found using the preset timer I'd end up with grinds all over the bench.

                                Agreed. I was not planning on leaves beans in the hopper ongoing, rather wanted to ensure my grind speed and quality is on par with other Roburs.
                                Thanks for your input.
                                GQ

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