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espresso versus drip grinding
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rmongiovi
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Joined: 7 Feb 2006
Posts: 406
Location: Atlanta, GA
Expertise: I like coffee

Grinder: Ditting KR805
Drip: Technivorm; Bonavita...
Roaster: Hottop B
Posted Tue Feb 10, 2009, 2:48pm
Subject: espresso versus drip grinding
 

I came across a posting on another site yesterday that claimed that the burrs designed for drip coffee are different from those designed for espresso.

The argument was that espresso burrs are designed to produce two humps in the coffee particle distribution - the normal size of the grind and smaller fines - that are required for a good espresso, but that burrs designed for drip coffee are made with only one hump - a uniform grind without fines.

The claim was that espresso burrs end with a flat rim at the outer edge of the burr that produces the fines, but that drip burrs do not.

Now, common sense tells me that if the burrs come to a flat rim at the outer edge, which mine certainly do, that would be the size of the ground coffee particle since no larger particle would make it through the burrs.  If indeed there are fines, they would have to be smaller than that outer rim.

The posting was claiming that grounds that have no fines don't produce good espresso, which may or may not be true.  What I'm more curious about is the basic claim that the burr design for espresso and the burr design for drip are fundamentally different and that a grinder that's good for espresso would of necessity be bad for drip, and vice versa.

Does anyone know anything about the theory of burr design?
Roy
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joey
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Joined: 24 Dec 2002
Posts: 341
Location: madison, wi
Expertise: I love coffee

Espresso: Oscar
Grinder: Mazzer Mini
Drip: Chemex
Roaster: Behmor
Posted Tue Feb 10, 2009, 11:23pm
Subject: Re: espresso versus drip grinding
 

i cant imagine that any one burr is superior for one type of brewing vs another.  the important part is that no matter what, the end result is grinds of the exact same size.
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RapidCoffee
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RapidCoffee
Joined: 4 Dec 2004
Posts: 1,931
Location: Rapid City, SD
Expertise: I love coffee

Espresso: La Spaziale S1
Grinder: Mazzer Robur
Vac Pot: Yama
Drip: misc
Posted Wed Feb 11, 2009, 1:38am
Subject: Re: espresso versus drip grinding
 

joey Said:

i cant imagine that any one burr is superior for one type of brewing vs another.  the important part is that no matter what, the end result is grinds of the exact same size.

Posted February 10, 2009 link

I'm afraid this statement doesn't hold water. Coffee is an agricultural product that is roasted, then literally smashed, broken, and crushed during grinding. This cannot possibly produce particles of exactly the same size. Particle sizing invariably shows a fairly broad range of grind particle diameters. For espresso grinders, you typically see two peaks: a larger diameter particle peak centered around 400-500um, and a much smaller diameter peak (the fines) centered around 40um.

This bimodal particle size distribution is thought to be desirable for espresso because the fines help regulate flow through the puck. For non-espresso brewing, fines overextract, muddy presspot coffee, and clog drip coffee filters.

rmongiovi Said:

Does anyone know anything about the theory of burr design?

Posted February 10, 2009 link

Unfortunately, no. But there's a nice discussion of different burr types here. Note Jim's identification of different grinding zones on the burrs. Some burrs (including Mazzers) have channels that extend to the rim, and may allow certain sizes of particle to escape.
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Luca
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Luca
Joined: 27 Jan 2004
Posts: 2,658
Location: Melbourne, Australia

Espresso: H: Maver W: FB-80
Grinder: H: Super Jolly W: Brasilia...
Vac Pot: Hario TCA-2
Roaster: Sample Roaster at Work
Posted Wed Feb 11, 2009, 4:31am
Subject: Re: espresso versus drip grinding
 

I think that Petracco wrote a chapter on grinder burrs in the Illy book.

Cheers,

Luca

 
General ramblings about coffee: http://www.pourquality.blogspot.com/

Reviews of Australian coffee: http://www.coffeereviewaustralia.com/
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RapidCoffee
Senior Member
RapidCoffee
Joined: 4 Dec 2004
Posts: 1,931
Location: Rapid City, SD
Expertise: I love coffee

Espresso: La Spaziale S1
Grinder: Mazzer Robur
Vac Pot: Yama
Drip: misc
Posted Wed Feb 11, 2009, 11:26am
Subject: Re: espresso versus drip grinding
 

There's a chapter on grinding, with a couple of pages on burrs. I think Jim's discussion is far more comprehensive.
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rmongiovi
Senior Member


Joined: 7 Feb 2006
Posts: 406
Location: Atlanta, GA
Expertise: I like coffee

Grinder: Ditting KR805
Drip: Technivorm; Bonavita...
Roaster: Hottop B
Posted Wed Feb 11, 2009, 12:18pm
Subject: Re: espresso versus drip grinding
 

Anyone have pictures comparing flat burr grinders from an espresso grinder with those from a grinder designed for drip?
Roy
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