I've owned this machine for over three years, and I cant get a consistently good shot.
-I have thoroughly cleaned and descaled the machine carefully following instructions.
-I am using a Rancillio rocky grinder, which has clean burrs and seems to work perfectly.
-For a double shot I measure 14 grams of ground coffee, and I tamp 'about' 30lbs of pressure which i have measured by pressing on a scale.
This is what happens:
A) Either the shot comes out too fast, about 10 seconds.
or B) If I adjust the grind finer, the machine hesitates (as though unable to push the water through), and finally I get 'channeling' , spurts of pressure, and a real mess.
I had similar issues with my Gaggia Classic and it all got down to bad grinders. I had a Baratza Preciso, purchased directly from the manufacturer (refurb) and I was seeing the exact same thing. My double shoots (18 grams) were running fast in about 13 seconds. If I went to almost 0-2 setting (finest settings), I would get longer brew's but I could tell the water getting stuck for a bit and than running somewhat burned. I reached out to Baratza on the grinder and long story short (after shipping me a 3rd grinder), I finally got a grinder that performed consitant through its settings. I am now in settings 7-8 and consitantly pulling 20-30 second shots with very rich brown crema shots. The grinder makes all the difference, as it may not be working as consitant as it should, causing inconsitant grinds. My two cents, I would troubleshoot your grinder and possibly try to narrow down the problem. (assuming you're using fresh rosted coffee beans).04-28-14 02:55PM
Thanks so much Daniel- this is what I've suspected even though its been a constant problem with my Rancillo Rocky- I'll look into getting the grinder refurbished/replaced and take it from there. Good to know the machine is capable of pulling great shots.