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Inconsistent grind with Gaggia MDF
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frink182
Senior Member


Joined: 24 Oct 2011
Posts: 2
Expertise: I love coffee

Posted Tue Aug 13, 2013, 6:54am
Subject: Inconsistent grind with Gaggia MDF
 

Hi, I have modified my Gaggia MDF to be stepless. I can achieve a good espresso grind for my Gaggia Classic by setting it at marker '4' for example (depending on the coffee etc). This will give me a ~25sec espresso.
My problem is this: if I grind another dose of coffee immediately after the first dose, and change nothing (coffee, dose weight, tamp, grinder setting), the machine will choke on the second espresso! So it appears that the second grind is much finer than the first. How can this be? I need to adjust the grinder to about setting '5' to get a decent espresso.
If I come back to the machine hours later, the original grinder setting '4' will be correct again.
Help!
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,775
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Tue Aug 13, 2013, 8:07am
Subject: Re: Inconsistent grind with Gaggia MDF
 

I suspect stale coffee is left in the grind path. Another thing, if you adjust the grinder, it takes at least one full dose of coffee to flush the old grounds out and to see what the new setting is, there is a lag.

If you are grinding fresh and it chokes your machine and then you wait to let it stale then it pulls OK, without any movement of the adjustment, I suspect grind retention in the grind path. Many people use a brush to clean the path from the grind chamber after each time they grind for a shot.

Remember, small changes can make a big difference so a big change like a whole number, can make a huge difference. YMMV!

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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brianl
Senior Member


Joined: 1 Dec 2012
Posts: 472
Location: Chicago IL
Expertise: I love coffee

Espresso: Quick Mill Vetrano DB
Grinder: Baratza Vario
Drip: chemex
Roaster: Behmor 1600
Posted Wed Aug 14, 2013, 12:15pm
Subject: Re: Inconsistent grind with Gaggia MDF
 

The gaggia MDF has huuuugggggeeee grind retention. Somewhere in the ballpark of like 4-5 grams if you don't brush it out of the chute after every dose. Don't forget about humidity and the weather too.

I did that, and eventually got sick of it so moved on. However, it does not have any grind issues and I found it very consistent.
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frink182
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Joined: 24 Oct 2011
Posts: 2
Expertise: I love coffee

Posted Thu Aug 22, 2013, 8:06am
Subject: Re: Inconsistent grind with Gaggia MDF
 

Thanks for the help - grind retention was in fact the problem. Since I use the machine 50% of the time for filter, the retained grounds were affecting my espresso grinding. I never noticed, and it now explains why I could never use my bottomless portafilter without spraying everywhere.
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