by another_jim on Sat Feb 19, 2011 7:09 pm
Patience, this is a little round about ...
I just spent some time at the "302" espresso course beta test, given at the Coffee Fest Chicago by Ellie Matuszek, formerly an Intelly Barista and USBC champ, now the training director for the SCAA (who are finally getting some major talent into their training programs). This is a very promising course that passes on the latest techniques in shot tuning, for instance, as found in Scott Rao's excellent book, to working baristas. The knock on both Scott's book and the gyrations us home baristas go through is that while they may work in a lab, at home, or for competition, they cannot work in a commercial setting. This course is going to prove that wrong
But to tune shots, you need to change dose and grind setting. The course featured the Mahlkoenig K30 WBC grinders. These grind 15 grams in roughly 3 seconds, or 5 grams per second. They are adjustable to the nearest 1/10th second ....
Obviously, they turned out to be somewhat useless for accurate dosing (the minimum 1/10th second adjustment = roughly 1/2 gram change). Therefore, the barista prepping the shot had to weigh doses and gradually zero in with time and grind setting changes to the new level the class was requesting after tasting the previous shot.
In short, 1/10th second timer based grinders with fast grind times are quite hard to tune in, requiring finicky grind and dose changes. Doing this once in the morning for each grinder's single coffee will work. But on the fly, for multiple coffees, timer grinders cannot replace weighing the dose. Therefore their advantage over doser grinders disappears except for Ian' contrast between button pushing versus thwacking.
It is time for a grinder where you can set the dose to the nearest 1/10th gram. That is the only certain method to let shops duplicate the best espresso making practices done in competition or homes. Until then, we are just arguing about which lame dosing method we hate least.