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Thread: DIY Atom Eureka Hopper for single dosing

  1. #1
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    DIY Atom Eureka Hopper for single dosing

    G'day guys

    I recently bought an eureka atom and have loved it, however I usually only single dose and with a commercial machine this led to lots of popcorning, long grind times and possibly an uneven grind.

    I had removed the hopper and started only dosing into the part before the burs and putting a filter basket on top to stop the popcorning, but I wanted to do something up like a small hopper.
    I understand the weight of the beans stops the beans underneath popcorning and if I had a smaller hopper less would go stale in maintaining that weight.
    I was in town today and headed over to Clark rubber and knocked this up. Fits perfectly in the atom (50mm inside diameter, 52mm outside), maybe a tiny bit too wide but it does the job.

    Hopefully it suits my needs, I thought I'd share
    For those that don't know the atom,
    the black rubber bit comes with the grinder.


    Attached Images Attached Images
    Last edited by science-teacher; 3 Weeks Ago at 01:01 PM.

  2. #2
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    Thank you for sharing this.

    Interested to know if your filter basket / single dose idea stopped the "pop corning" enough to grind to a normalish grind time?

    Keen to give your small doser chamber idea a try. What part #s did you get from Mr Clark?

    That red cap looks like it might fit direct in to grinder chute for single dose cap
    Last edited by matth3wh; 3 Weeks Ago at 01:46 PM.

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    Quote Originally Posted by matth3wh View Post
    Thank you for sharing this.

    Interested to know if your filter basket / single dose idea stopped the "pop corning" enough to grind to a normalish grind time?

    Keen to give your small doser chamber idea a try. What part #s did you get from Mr Clark?

    That red cap looks like it might fit direct in to grinder chute for single dose cap
    G'day
    The only thing that really stopped the pop corning was more beans, but laying putting the basket there stopped a bit.

    I went in asking for a 50mm perspex tube and he took me out the back to like a workshop and found this piece. He called it something like an eye glass (?), I couldn't understand his accent very well. The cap is just a generic cap thingo.
    A 50 or 52mm perspex tube would work fine and would probably be way cheaper
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  4. #4
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    I didn't get out to Mr Clarks shop but I did have a look in our pantry for some options for covering the beans and holding them down single dose style.

    Tried cutting out a yoghurt container lid first but then it requires my unpatented masking tape cord. Changed to blue cup and old convex tamper from the back of the cupboard.

    18.1 sec - 19.1g in and 18.5g out. I suppose I could have tried another pulse or two to get more out. Will try that now.

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    Quote Originally Posted by matth3wh View Post
    I didn't get out to Mr Clarks shop but I did have a look in our pantry for some options for covering the beans and holding them down single dose style.

    Tried cutting out a yoghurt container lid first but then it requires my unpatented masking tape cord. Changed to blue cup and old convex tamper from the back of the cupboard.

    18.1 sec - 19.1g in and 18.5g out. I suppose I could have tried another pulse or two to get more out. Will try that now.

    The creativity. Yeah thats pretty much what I did except with a basket.

    If you fill up the entire area under your cup the popcorning should stop for the single shot or so.
    I'll video mine tomorrow and show ya
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  6. #6
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    I found a stray bean in the top.

    19.1g in 20g out. First grind for 18 seconds. Second pulse 1 sec. Third pulse 2 seconds.

    Then took this photo.

    Aside from that. This photo shows I need to clean out the throat of the grinder.

    Also found another couple of stray beans there.


  7. #7
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    Be interested to here what you thing of grind fineness too as a result of further single dose testing. I think you mentioned in your first post.

    Yes likely need to grind a little bit finer for your shots. Two test shots.

    Bit cleaner ...



    Some video of spinning - https://www.dropbox.com/s/eh5g4a65h9...%20pm.mov?dl=0

    And now 40.2g of cafetto grinder clean pills in...
    Last edited by matth3wh; 3 Weeks Ago at 09:56 AM.

  8. #8
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    Quote Originally Posted by matth3wh View Post
    I found a stray bean in the top.

    19.1g in 20g out. First grind for 18 seconds. Second pulse 1 sec. Third pulse 2 seconds.

    Then took this photo.

    Aside from that. This photo shows I need to clean out the throat of the grinder.

    Also found another couple of stray beans there.

    Yes no matter how long I grind there are often stray beans due to that auger or whatever it is. Why I resorted to using a small hopper and risking them go stale

  9. #9
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    And now...







    47.5g out.

    Grind Cleaner captured 7.5g of stray grounds.

    Plus this residue to vacuum out.



    And post vacuum we are clean again


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    That's a lot of residual grounds. Jeez

  11. #11
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    Quote Originally Posted by science-teacher View Post
    That's a lot of residual grounds. Jeez
    And here are the first two rounds of shots post vacuuming ... note the missing grinds...

    19g in 9.1g out ... another pulse and eventually 9.7g out

    --> so 9.3g in there somewhere







    And...


    --> next dose much better

    18.9g in and 18.5g out.





    It does clean up nicely
    Last edited by matth3wh; 3 Weeks Ago at 09:13 PM.

  12. #12
    Senior Member matth3wh's Avatar
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    Quote Originally Posted by science-teacher View Post
    That's a lot of residual grounds. Jeez
    Will likely find in most other not specifically designed for single dose grinders that there's anywhere from 2g to 20g hiding up somewhere inside.

  13. #13
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    Good to keep the chute rubber at the hopper in place as without it there's an ingress point for beans in to the body...



    And then there's the easily removable PF holder../


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    Quote Originally Posted by matth3wh View Post
    Will likely find in most other not specifically designed for single dose grinders that there's anywhere from 2g to 20g hiding up somewhere inside.
    So I suppose for us single dosers there's not much we can do except
    -clean meticulously every shot
    - hope the retained band stay hidden up there and the fresh beans pass on through?
    :/

  15. #15
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    You could try removing the declumping mechanism and see if isn't too clumpy

  16. #16
    Senior Member matth3wh's Avatar
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    With my previous grinder - La San Marco SM95/a I would alway single dose... and when switching beans would feed it a sacrificial 5g change of beans to purge old grounds through. That seemed to be about right.

    Since owning the Atom I've changed habits to simply going through one variety of beans at a time and using the standard hopper and generally throwing in enough beans for the days usage. Are beans exposed to air more... sure. Still getting tasty shots out.

    Level3Ninja - I'll have a look inside and see what I can see. I've been curious to see how many grinds I've collected in the body of the grinder at 800+ doubles.

    * Since seeing what happens when grinding, I've wondered about removing the Eureka stamped plastic "auger"/cover in order to see what happens.
    * I've also wondered whether pressing a hole in the middle of the blue cup or foam cup to allow the nut to come up through the cup and further reduce the space for beans to move.
    Last edited by matth3wh; 3 Weeks Ago at 12:49 PM.

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    Quote Originally Posted by matth3wh View Post
    I didn't get out to Mr Clarks shop but I did have a look in our pantry for some options for covering the beans and holding them down single dose style.

    Tried cutting out a yoghurt container lid first but then it requires my unpatented masking tape cord. Changed to blue cup and old convex tamper from the back of the cupboard.

    18.1 sec - 19.1g in and 18.5g out. I suppose I could have tried another pulse or two to get more out. Will try that now.

    Heres a video of mine in action mate
    https://youtu.be/jJOhlPvVoTw
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  18. #18
    Senior Member matth3wh's Avatar
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    Quote Originally Posted by science-teacher View Post
    Heres a video of mine in action mate
    Good video. Clear funnel helps show what's going on. Highlights the pop-corning of the beans.
    If the funnel was about 1/4 that height and you could invert the rubber cap down inside the top to further reduce the bean travel it should reduce grind time.

  19. #19
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    Lid off Part 1





  20. #20
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    Lid off part 2

    * Exit chute/clump buster - coffee collection point... between 2.1g and 3g collects at the clump buster

    * The chute ramp stays really clean











    * Video of all the coffee in the grinds chamber as it is turned by hand https://www.dropbox.com/s/d9kj1dnhr7...%20pm.mov?dl=0
    Last edited by matth3wh; 3 Weeks Ago at 12:29 PM.

  21. #21
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    DIY Atom Eureka Hopper for single dosing

    Post cleaning single dosing test...

    * First - 20g in 11.3g out

    * Second - 20g in 19.1g out

    -- based on cleaning/ weighing so far I'd say about ~7g in chamber and ~2.5g at the clump crusher.
    Last edited by matth3wh; 3 Weeks Ago at 12:44 PM.

  22. #22
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    DIY Atom Eureka Hopper for single dosing

    Clever rubber mounting of the motor / grind chamber... gives the Atom its quiet.


  23. #23
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    DIY Atom Eureka Hopper for single dosing

    Not so good it that coffee grinds can get down on this PCB... waiting to catch it.

    In saying that it's not heaps but then I'm not sure circuitry likes coffee/coffee oils.

    Good to inspect as part of regular maintenance routine.


  24. #24
    Senior Member matth3wh's Avatar
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    DIY Atom Eureka Hopper for single dosing

    Third - single dose grinding 20g in 19.9g out in 36.8 secs

    Kitchen paper towel buffer assist.



    Then coffee was made...

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  25. #25
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    I single dose as well and honestly have been annoyed at the popcorning issue and also how sometimes beans would just not get "sucked in" to be ground. This evening I removed the black plastic agitator (the one with the Eureka logo on it) as I had the same thoughts about it as you did.
    It made things infinitely better. No more popcorning. I tried it about 10 times. 100% of single dosed beans were ground 100% of the time. Grind retention behind the clump buster remained though. I might remove clump buster and see what it does. To be honest, I would rather a bit of clumping than all that grind retention. I used to always stir my grinds after grinding anyway.
    Hope this helps

    Quote Originally Posted by matth3wh View Post
    With my previous grinder - La San Marco SM95/a I would alway single dose... and when switching beans would feed it a sacrificial 5g change of beans to purge old grounds through. That seemed to be about right.

    Since owning the Atom I've changed habits to simply going through one variety of beans at a time and using the standard hopper and generally throwing in enough beans for the days usage. Are beans exposed to air more... sure. Still getting tasty shots out.

    Level3Ninja - I'll have a look inside and see what I can see. I've been curious to see how many grinds I've collected in the body of the grinder at 800+ doubles.

    * Since seeing what happens when grinding, I've wondered about removing the Eureka stamped plastic "auger"/cover in order to see what happens.
    * I've also wondered whether pressing a hole in the middle of the blue cup or foam cup to allow the nut to come up through the cup and further reduce the space for beans to move.
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  26. #26
    Senior Member matth3wh's Avatar
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    Brilliant EnigK. That is really good to know about removing the agitator.

    Yes i think it would be worth trying removing the clump buster as that's another 2-3g potentially not collecting inside.

    However if you do make changes / remove the clump buster I would recommend inspecting again after a session or two for unexpected consequences like grounds remaining in exit chute or grounds ending up in the body of the grinder.

    This thread is going well.

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    It's almost an owners thread, I love it! Hahaha
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    Up and Atom!
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    Hi Mattt..

    Just curious as to where you got the grind cleaner tablets ? I can find the powder but not the tablets. It may be that they are one and the same but the tablets look like a neater option

    Cheers,

    Alastair
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  30. #30
    Senior Member matth3wh's Avatar
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    Quote Originally Posted by Hoggers View Post
    Just curious as to where you got the grind cleaner tablets ? I can find the powder but not the tablets. It may be that they are one and the same but the tablets look like a neater option
    Hi Alastair

    Got some from Di Bartoli online...
    Cafetto Grinder Cleaning Tablets 430g

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    Thanks Matt

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    Quote Originally Posted by Enigk View Post
    I single dose as well and honestly have been annoyed at the popcorning issue and also how sometimes beans would just not get "sucked in" to be ground. This evening I removed the black plastic agitator (the one with the Eureka logo on it) as I had the same thoughts about it as you did.
    It made things infinitely better. No more popcorning. I tried it about 10 times. 100% of single dosed beans were ground 100% of the time. Grind retention behind the clump buster remained though. I might remove clump buster and see what it does. To be honest, I would rather a bit of clumping than all that grind retention. I used to always stir my grinds after grinding anyway.
    Hope this helps
    Hey mate, how did you remove the auger? I find it's spinning and now sure how to lock it in place to remove the nut

  33. #33
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    Oh so what I did was to insert an allen key (any straight and stiff implement will do) through the chute, from the outside where the clump buster is, until it touches the rotating burr housing - this will stop the motor from rotating when it catches on one of the two raised edges of the housing (see those two raised bits at the 6 and 12 o clock positions in photo attached). Hope this helps.
    Quote Originally Posted by science-teacher View Post
    Hey mate, how did you remove the auger? I find it's spinning and now sure how to lock it in place to remove the nut
    IMG_20170928_173211.jpg

  34. #34
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    Hi Atom users, so I have a public service announcement to make. Do not, for the love of god, remove the clump buster. I have tried this and the result was hilariously disastrous! The static build up was so extreme that the grounds just refused to go through the chute and just stuck to the walls of the chute. When I cleared the chute with a chopstick, the highly-charged grounds did make it through the chute but would spray EVERYWHERE and stick to the grinder's body. Seriously, I thought I was gonna see lightning bolts from any static discharge. See photos and have a laugh. So from my experiments, I would recommend auger comes off and clump buster stays in place.

    The clump buster being there does result in quite a bit of grind retention I noticed. Grinds not only got retained at the exit chute but on the burrs as well - see photos. IMG_20170928_175322.jpgIMG_20170928_175444.jpgIMG_20170928_180518.jpg

  35. #35
    Senior Member matth3wh's Avatar
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    Epic result! 🤡

  36. #36
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    Well, that settles that!
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  37. #37
    Senior Member matth3wh's Avatar
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    What about half a declumper? 🤣🤡

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