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Dosing techniques for VBM domo

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  • Dosing techniques for VBM domo

    I have been getting some minor channeling on the sides of my coffee puck.

    Dosing technique:

    Dose, collapse, Dose, level, brush off excess, tamp, light tap, tamp

    I have gone to the extent of filling my basket very slowly and collapsing/leveling evenly making sure theres no uneven distribution...

    My guess would be the tap before my last tamp...might agitate the side of the puck...

  • #2
    Re: Dosing techniques for VBM domo

    Gavin
    I am also learning fast, a similar but a different machine:
    Add to you technique
    Vertical tap on bench to settle the grinds
    Side tap after a light tamp to settle the edges. I would not tap after a heavy tamp, I also heavy tamp twice and check the tamper is level - the grinds are level - in the filter basket.

    Then occasionally with my finger I press around the inside of the basket to check the evenness of the tamp.

    I am using the restricted double shot technique - uses a lot of grinds but oh so creamy and sweet.  So The above my not quite apply but may help

    dumiya

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    • #3
      Re: Dosing techniques for VBM domo

      Hmm doesnt seem to be very different ... ill keep practicing...

      Comment


      • #4
        Re: Dosing techniques for VBM domo

        Hi gavin,

        First up, when you say that there is channeling, what are the symptoms? Are you seeing it with a bottomless pf? Is it just a chip in the top of the puck? Is the flow suddenly gushing? Are you tasting it?

        I suspect that youre right about the side tap. Let us know what its like if you get rid of it. The only other thing that springs to mind is that perhaps the puck might be ripping up on the shower screen? You can test this by inserting the handle with the prepared puck and then removing it. I seem to remember having to lower my dose for the VBM. If thats the problem, you could always get a deeper basket.

        If neither of those things is the problem, I think that it might just be a case of keeping it simple. Forget all of the distribution, slow dosing, etc, and see what happens. You might be surprised. In fact, you might want to just try that anyway - it might save you a lot of time!

        Cheers,

        Luca

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        • #5
          Re: Dosing techniques for VBM domo

          You did not mention what grinder you have. Some grinders create clumps that can cause problems in your attempts to get an even distribution. Try the WDT (Weiss Distribution Technique):

          1- overfill the basket
          2- use a straightened paper clip or make a tool by pushing a sewing needle into the rubber eraser on a pencil Use the tool to "stir" the grounds in the basket. Stir in overlapping circles and go all around the basket. This will fluff up the coffee, break up any clumps, and even out the distribution.
          3- Level off the coffee mound with a straight edge across the top of the basket.
          4- gently tap the portafilter assembly downwards on the counter or suitable surface two or three times to settle the grounds.
          5- Tamp

          If we can assume that you have a proper-fitting, flat-bottom tamper, then this should really help if distribution or clumping is the source of the problem.

          Comment


          • #6
            Re: Dosing techniques for VBM domo

            Grinder is mazzer mini. no clumping.

            As with symptoms, I dont have a naked PF. The shot starts off thick but when is starts to get lighter, there are slight signs of blonding all the way through the entire shot. Puck gets chiped slighty at the corner and sometimes visible hairline cracks again at the corner.

            Will give it all a try. thanks guys!

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            • #7
              Re: Dosing techniques for VBM domo

              I should buy a naked pf..... now im at 50 post! lol

              Comment


              • #8
                Re: Dosing techniques for VBM domo

                Originally posted by Gavin1 link=1208869276/0#6 date=1208900813
                I should buy a naked pf..... now im at 50 post! lol
                That you should Gavin

                Coffeeparts and DiBartoli both sell them and at very keen prices as well 8-)

                Comment


                • #9
                  Re: Dosing techniques for VBM domo

                  Ok...the last couple of shots were better actually...no more cracks on the side of the puck...this is what I did:

                  Dose(tap against the fork as I dose), level, light tamp, tap, tamp, twist....

                  But....I ran out of my usual beans and had to swap to another and I started getting a gush as the shot lightens.....probably needs a finer grind......now I dont have time to play anymore as I have to leave.....

                  hmm.....

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                  • #10
                    Re: Dosing techniques for VBM domo

                    Looks like it was the tap that was causing the side channeling.....

                    Comment


                    • #11
                      Re: Dosing techniques for VBM domo

                      Yup,

                      Makes sense Gavin.... Anything in your technique that disturbs the integrity of the puck or its adhesion to the basket is going to cause trouble. Consistency coupled with the simplest approach seems to nearly always win out in the end.

                      Great to have everything back under control, eh.... 8-)

                      Mal.

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                      • #12
                        Re: Dosing techniques for VBM domo

                        Yeap!

                        last shot I pulled from andys freshly roasted beans into these sexy looking bodum pavina espresso glasses looked incredible......coffeeporn

                        mmmm

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                        • #13
                          Re: Dosing techniques for VBM domo

                          I just recently thought about it and could it be that my tamper is not a PERFECT fit and that the tiny tiny tiny little gap is creating less pressure in that area causing the side channel?

                          hmmm ill experiment with my nekkid when it gets here later

                          Comment


                          • #14
                            Re: Dosing techniques for VBM domo

                            Dont worry about getting a PERFECT fit....it does not matter as much as you think it does. Its more important to get a perfect distribution of coffee in your handle and a perfectly level tamp. A little bit of ride up on the edge of the basket is perfectly acceptable and will not effect your extraction to the point where it becomes an unacceptable extraction.

                            Comment


                            • #15
                              Re: Dosing techniques for VBM domo

                              Nekkid PF just came into the mail....Extraction was very even....obviously no more side channeling from all the dosing changes.

                              Solution: Forgot about all your fancy schmancy dosing techniques and just put coffee in there, even it out, tamp and extract.....superb

                              much easier to spot blonding on the nekkid.....gawsh my shots are tasting heaps better

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