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  • #31
    Re: EM6910 stuck puck

    My scientific mind is satisfied.   I have a reproducible experiment!  8-)
    • Preheat group handle and portafilter by running 100 ml of water through.
    • Wipe dry portafilter and shower screen.
    • Fill portafilter with freshly ground coffee and tamp with 15kg pressure.
      • A. Fill so that the silver portion of the Sunbeam tamper is about half way above the top of basket.
        (Normal grind)

        B. Fill so that the silver portion of the Sunbeam tamper is completely inside the basket - about 0.5-1.0mm under the top of basket.
        (Slightly finer grind to achieve equivalent extraction to above method.)
    • Pull about a 35-40 ml shot.
    • Wait 20 seconds.
    • Remove PF.

    Method A. will produce a puck that comes out neatly.
    Method B. will produce a puck that will stick to the shower screen and occasionally break up in the PF.

    I performed six experiments in a row, alternating between the two methods.  I had 100% repeatable results with three stuck pucks and three good pucks.

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    • #32
      Re: EM6910 stuck puck

      Yay!!!!!

      So do we conclude that underdosing results in a puck not heavy enough to overcome some kind of suction or other such force at the screen?

      Comment


      • #33
        Re: EM6910 stuck puck

        Originally posted by Thundergod link=1226019023/20#31 date=1228307210
        Yay!!!!!

        So do we conclude that underdosing results in a puck not heavy enough to overcome some kind of suction or other such force at the screen?

        My guess is (based on experience with a La Cimbali 2 group - admittedly a bit different!)

        When water hits the puck it expands.....

        When you updose, there is little or no "head room" for the puck to expend into...
        So the puck becomes compressed and is homogeneous.... like a lump of clay! And stays together rather than sticking to the showerscreen etc... Because it is denser, it wont break up when knocked out.

        With a lower dose the puck has more room to expand into, so doesnt clump together..... it can stick to the showerscreen as it is more like a collection of wet grains of sand..... and will also break up easier.....

        In summary - updosing - a firmer puck which comes out more cleanly (and better tasting espresso as well) - all for the cost of a couple of extra grams of coffee

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        • #34
          Re: EM6910 stuck puck

          Originally posted by 617465746364110 link=1226019023/0#0 date=1226019023
          I have developed a new problem with the puck sticking to the shower screen of the EM6910. I can get it off by loosening the PF and using the manual button to deliver a one or two second burst of water.

          What are the likely causes for the puck sticking to the shower screen?
          Ive been having the same problem. Tried all sorts of solutions starting with a good clean, then varying the dose and the tamping pressure. Every second puck seems to stick.
          Has anyone tried removing the plastic insert that sits under the filler basket?
          I never had this problem with other machines, just with the Cafe series Sunbeam. Apart from that Im happy with it and its more reliable than my Gaggia.

          Comment


          • #35
            Re: EM6910 stuck puck

            Originally posted by 57495D1B0 link=1226019023/33#33 date=1291169381
            Originally posted by 617465746364110 link=1226019023/0#0 date=1226019023
            I have developed a new problem with the puck sticking to the shower screen of the EM6910. I can get it off by loosening the PF and using the manual button to deliver a one or two second burst of water.

            What are the likely causes for the puck sticking to the shower screen?
            Ive been having the same problem. Tried all sorts of solutions starting with a good clean, then varying the dose and the tamping pressure. Every second puck seems to stick.
            Has anyone tried removing the plastic insert that sits under the filler basket?
            I never had this problem with other machines, just with the Cafe series Sunbeam. Apart from that Im happy with it and its more reliable than my Gaggia.
            As stated in teh posts above... Underdosing and tamp is the reason for teh stuck puck.

            What black plastic thing ;D Remove IT

            Comment

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