I am trying to find a guild / table that indicates - measured - recommended coffee ground particle size targets ( sizes measured in microns ) for different brewing methods and filter types : AeroPress, Chemex, French Press, V60, etc. I have seen visual guides published with coins as a comparison, but no one seems to have published a thorough recommendation table with measured sizes.
“Consumer” products like the new Rafino sieves offer the ability to measure grind size in microns within the affordable price range for consumers and small businesses.
I know “ideal size” is subject to the chain of other variables - humidity of the beans, varietal, extraction time, water temp, etc. However - I believe a table indicating approximate targets for each method is never-the-less useful as a starting point. I would imagine each type of paper filter ( Chemex, Hario, AeroPress, Melita, … ) and metal filters have material densities that establish a recommended range. Each method has its particular impact on extraction time. Granted - each barista will adjust on their own experience and knowledge.
I live in Guatemala and the practice that I see here for small coffee chains that roast their own coffee is that they do test grinds with their coffee, prepare sample standardized brews and test the results via TDS. Depending on the batch of roasted coffee, they adjust bulk grind size up or down to optimize TDS. Makes sense if you can afford a TDS meter, but still leaves the grind size as a qualitative variable ( not measured)
A TDS meter is out of the reach of most people. A quantitative based micron sieve is becoming available.
Can anyone point me to a table of recommended measured particle size targets for different brew methods?
Look forward to the discussions and perspective!