I have noticed my shower screen impressions are pretty curved on my pucks (big surprise, with a convex screen), and I wonder if a convext tamp might be better for my extractions. My thinking is that, with my flat tamp, the coffee is having room to expand along the edges, but not in the center, and so it comes out much slower in the middle.
And you know, thinking in those terms, that means that my shots are probably generally underextracting, because I stop them when the outside begins to pale (and of course, if the inside started later, it's much darker and less extracted). Where I am going with that is, I think I DO need to grind finer, because the extractions I am getting aren't full and they take about 30 seconds (and they are 2.5 oz too, should be smaller). Am I making sense?
Yes, but I have a flat tamper as well and cannot discern any difference in results.
Have you tried a slightly smaller dose? I think if you have a little extra headspace you won't have the problem of screen interference causing uneven extraction in the center.
Jon, do use a convex tamp? I have noticed my shower screen impressions are pretty curved on my pucks (big surprise, with a convex screen), and I wonder if a convext tamp might be better for my extractions. My thinking is that, with my flat tamp, the coffee is having room to expand along the edges, but not in the center, and so it comes out much slower in the middle.
Not directed at me but... I'd guess a convex tamp would be desirable with a convex shower screen. I've tried a friend's convex tamp once or twice, and it didn't make much difference in my pours. But I have a flat shower screen (and only pulled a couple of shots with it).
shadowfax Said:
And you know, thinking in those terms, that means that my shots are probably generally underextracting, because I stop them when the outside begins to pale (and of course, if the inside started later, it's much darker and less extracted). Where I am going with that is, I think I DO need to grind finer, because the extractions I am getting aren't full and they take about 30 seconds (and they are 2.5 oz too, should be smaller). Am I making sense?
Sure. I just pulled my first triple in several days using freshly roasted beans, and of course my grind was off, but in the other direction (too fine). Delayed onset, longer flow than usual, and early blonding (starting around 1.5-2oz). Not one of my best but y'know, still very drinkable. A couple of frames follow...
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