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Tamping: The Myth and The Magic

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  • #16
    Re: Tamping: The Myth and The Magic


    Im on my 3rd EM6900 (Warrantee) and sunbeam tell you not to pack the assessories inc PF...so I have accumulated 3 PFs... so I modified one to a naked....and with buy a single spout for another...

    Marc

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    • #17
      Re: Tamping: The Myth and The Magic

      Hi All,

      There have been a few comments referring to this thread about not polishing at all. Polish all that you want, just dont put any pressure down when you do it. Anyhoo, like I said, this is just what I do with the particular setups that I get to use - not sure if its a technique of general application.

      Hi Thundergod,

      To tell you the truth, I have never really paid much attention to the ridges vis-a-vis dose, I just look at them to make sure that theyre parallel with the top of the basket. In any case, Ive mainly been using my coffeelab and espro lately, as my Pullman has been off being compared with other Pullman prototypes.

      What I tend to do is to grind and use my finger to move the grounds around so that it is level with the top of the pf. I then rap the pf on the bench four or so times to collapse, then top up and level off again. This dose is my nominal starting point. As I have a stepped grinder, Im forced to vary my dose up or down to get the extraction that I want, but dosing in this way gets me in the ballpark.

      Hi Dr T,

      Interesting that tamp pressure makes so much difference to you. I wonder if some of it - eg; dose, tamp, dose more - isnt actually more about varying the dose?

      Id agree with everyone else about removing the plastic thing at the bottom of your PF. In his quick review of the EM6900, Alan Frew had this to say:

      After the first week of testing I had to take a break due to pressure of work. When I resumed, I was getting weird flavours & aromas in the shots, even after rigorous cleaning. Finally I saw that the freshly soaked and rinsed portafilter was still leaking brown goo, from around the black plastic liner. I removed the liner to find an interesting collection of growing things and coffee tars in the base of the portafilter. Thereafter I left the liner out. Sunbeam tell me that it is there to stop heat loss from the coffee to the portafilter, but leaving the portafilter in the group and flushing some hot water through it prior to a shot will prevent this anyway.
      Have fun,

      Luca

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      • #18
        Re: Tamping: The Myth and The Magic

        Hi guys,

        I thought that I should post a link to this article on coffeegeek. It seems that Mark Prince is tamping once, then tamping four more times to dislodge grounds from the side of the basket. He does not say whether he does these subsequent tamps at full pressure.

        Cheers,

        Luca

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        • #19
          Re: Tamping: The Myth and The Magic

          Hi Luca,

          I read that article a few days ago.. it was interesting...

          What I think is important is having a perfectly fitting Tamp and a consistent technique. And not over complicate the tamping procedure - Which I can see is happening... Its a simple procedure that while done right, will yeild quite a nice shot. Having said that, getting the Naked PF is a definite must to define your tamping and dosing... I think what you said in your tamping method is spot on... and yes, I do a light polish to settle any lose grounds after an initial wiggle/\/shake of the PF.

          The "Four or more times to dislodge grounds from the basket" is I think going too far in the procedure.... just upturn the PF and lose the lose grounds and polish once...

          Thats my opinion anyway... :-)

          Marc

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          • #20
            Re: Tamping: The Myth and The Magic

            Originally posted by luca link=1158499987/15#17 date=1160487407
            Hi guys,

            I thought that I should post a link to this article on coffeegeek.
            Gday Luca,

            Just finished reading this article and to be honest, I think it is mostly a load of crap. The method you have described is very similar to the one I have been using for the past couple of years and after dissecting a few pucks both before and after brewing, I can vouch for the fact that the grounds are packed evenly all the way from top to bottom.... no loose bottom third or quarter or whatever. Would have thought that someone with MPs years of experience wouldnt get sucked into regurgitating this kind of tripe.

            Well, thats me for the night ,

            Mal.

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            • #21
              Re: Tamping: The Myth and The Magic

              Mal,

              I remember on the movie "Ferris Buehlers Day Off" he said of his buddy Cameron, "Cameron is so uptight if you stuck a lump of coal up his ass, it would turn into a diamond".

              I think it the case with these coffegeeks too and the sometimes bizzare theories that they come up with. The theory discussed also sounds like total bollocks, by the by.

              Grant



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              • #22
                Re: Tamping: The Myth and The Magic

                Yeah, I, personally, am not going to be changing my tamping style any time soon of the force of Marks article. I get good shots and theyre somewhat consistent, so Im happy.

                I think that theres no reason to have to make presumptions one way or another when it comes to the theory that only the top is compacted. It should be a relatively simple matter to get some cold, hard numbers. The procedure would be something like this:

                (a) Remove the pf spring from the basket.

                (b) Do the control basket. Dose and tamp as normal. Remove the basket and weigh it. Time the shot.

                (c) Dose half-way, distribute, tamp and finish off as normal. Weigh and time shot.

                (d) Dose a quarter of the way, distribute, tamp. Repeat until basket is 3/4 full, then finish off as normal. Weigh and time shot.

                (e) repeat (b) to (d) a few times for good measure.

                If the bottom isnt getting compacted that much, you would espect the single-tamped basket to weigh less and extract faster.

                Cheers,

                Luca

                Comment


                • #23
                  Re: Tamping: The Myth and The Magic

                  Yep,

                  Too simple by far..... I wonder why MP didnt think of that? I just used a standard deflection gauge which measures the amount of force required to penetrate the puck via a 6mm spherical tipped plunger. In all cases, the force required was close enough to identical within the same puck with slight variations from one puck to another but in no case did I find a stratified divergence of compression between particles at different depths from the puck surface.

                  I did all this about 2-2½ years ago just to help me develop a tamping method that did the job, was consistent to apply and manageable for me (have very poor strength left in my hands and fingers). Like I mentioned above, the method I use is almost identical to what you describe Luca and I cant see any need to change it now.

                  Mal.

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                  • #24
                    Re: Tamping: The Myth and The Magic

                    Not to mention the problems of getting a solid tamp around the edges of the puck when tamping at the 1/4, 1/2, and 3/4 levels. Seeing as you will have to use an undersized tamper in order to get it past the spring ridge in the basket. Which of course means that the outter 3mm or so receives no tamp at all until the very last full tamp. Seems to me that would make a perfect route for some major channeling and only with a ridgeless basket would this have any chance of working effectively.

                    Java "Believes in K.I.S.S." phile
                    Toys! I must have new toys!!!

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