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Mazzer Robur uneven grinds?

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  • DesigningByCoffee
    replied
    Originally posted by pcf1978 View Post
    I agree Matt - that is exactly what I've found with my Kony-e. I just load the hopper with the day's worth of beans in the morning (100g +/-) and grind away. I might dump the first double worth, but no purging between shots and my screen is intact.
    Yep. I only have 120-150g in my micro-hopper - might purge 5-10g before a grind. There might be a slight difference overnight after a late morning brew the day before, but with my super freshly roasted beans (I often end up with them in the machine the same day when people turn up wanting some right now!) I tend to find it can help to settle to pour - really fresh through can be a little bright, but a few hours helps to rest them in the chute!

    I must be a bad, bad, bad snob

    And I tried removing the screen once - a coffee flew out of the bottom of the spout all over the bench and virtually none in the p/f - so out went that idea! Is there for a reason I guess!

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  • moreCoffee
    replied
    Originally posted by DesigningByCoffee View Post
    Ahhhh that makes more sense

    I don't single dose, but when I do completely flush the system (after grinding a bag of plunger for a friend for eg) it does take 4-5 secs for a good flow of grounds to start coming out again, then 3-4 secs more to fill. So sounds like your machine may be fine - it's just not really being used as it was intended

    The whole question of retained grinds is another one of 'those' questions around here - you'll bring out all sorts! FWIW I've left the screen in mine and don't flush out after each grind. This is fine, with little impact on the taste IMHO if you are doing 2-3 doubles/triples a day so refreshing regularly - less than this and it starts to be an issue. But it is a commercial grinder designed for high turnover…
    Just my 2 bobs

    Cheers Matt
    I agree Matt - that is exactly what I've found with my Kony-e. I just load the hopper with the day's worth of beans in the morning (100g +/-) and grind away. I might dump the first double worth, but no purging between shots and my screen is intact.

    Leave a comment:


  • skidquinn
    replied
    Originally posted by DesigningByCoffee View Post
    Ahhhh that makes more sense

    I don't single dose, but when I do completely flush the system (after grinding a bag of plunger for a friend for eg) it does take 4-5 secs for a good flow of grounds to start coming out again, then 3-4 secs more to fill. So sounds like your machine may be fine - it's just not really being used as it was intended

    The whole question of retained grinds is another one of 'those' questions around here - you'll bring out all sorts! FWIW I've left the screen in mine and don't flush out after each grind. This is fine, with little impact on the taste IMHO if you are doing 2-3 doubles/triples a day so refreshing regularly - less than this and it starts to be an issue. But it is a commercial grinder designed for high turnover…
    Just my 2 bobs

    Cheers Matt
    Good to hear. Thanks Matt.
    Interesting point re. retained grinds. I might also give this a go and see if I can actually taste a difference.
    One of the other big reasons I single dose is I like changing around beans.
    Certainly agree with you on the commercial grinder point.... but I was offered this one at a price that I simply couldn't refuse. Plus they are awesome. haha

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  • skidquinn
    replied
    From time to time I do use a bottomless portafilter, however most I make are split for me and the wife. So doesn't get as much use as I'd like.
    However, when I've used it I haven't found issues with uneven shots grinding straight into the portafilter.
    I'll give that a go now that I've got new burrs and report back.

    Leave a comment:


  • DesigningByCoffee
    replied
    Originally posted by skidquinn View Post
    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?
    Ahhhh that makes more sense

    I don't single dose, but when I do completely flush the system (after grinding a bag of plunger for a friend for eg) it does take 4-5 secs for a good flow of grounds to start coming out again, then 3-4 secs more to fill. So sounds like your machine may be fine - it's just not really being used as it was intended

    The whole question of retained grinds is another one of 'those' questions around here - you'll bring out all sorts! FWIW I've left the screen in mine and don't flush out after each grind. This is fine, with little impact on the taste IMHO if you are doing 2-3 doubles/triples a day so refreshing regularly - less than this and it starts to be an issue. But it is a commercial grinder designed for high turnover…
    Just my 2 bobs

    Cheers Matt

    Leave a comment:


  • samuellaw178
    replied
    No worries! Glad to know I'm not the only insane one for single dosing Robur-E at home

    Another question : do you use a bottomless portafilter? I discover that the grind needs to be mixed to pull evenly under a naked portafilter. So because of that, I grind into a stainless steel dosing cup, give it a quick shake/stir, and then pour into the basket. I don't dose directly into the portafilter from the grinder. Slightly more hassle but the results are spot on every time and worth the extra effort for me.

    Leave a comment:


  • skidquinn
    replied
    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

    Leave a comment:


  • samuellaw178
    replied
    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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  • moreCoffee
    replied
    I think if you try using it without single dosing, sweeping or purging - your grind times will come within spec.

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  • skidquinn
    replied
    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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  • rackxp
    replied
    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)

    Leave a comment:


  • dumiya
    replied
    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

    Leave a comment:


  • DesigningByCoffee
    replied
    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…

    Leave a comment:


  • skidquinn
    replied
    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!)

    Leave a comment:


  • skidquinn
    replied
    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

    Leave a comment:

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