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Grind retention: best grinder that happens to be good on other points as well?
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Discussions > Coffee > Machines > Grind retention:...  
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rasqual
Senior Member
rasqual
Joined: 29 Jun 2005
Posts: 1,071
Location: Chicago area
Expertise: I love coffee

Espresso: *$ Barista, non-pressurized
Grinder: SMP
Vac Pot: Yama, Aeropress
Drip: Porcelain Melitta 103, Hario
Roaster: "ring roaster", mod popper
Posted Mon Jul 29, 2013, 11:38am
Subject: Grind retention: best grinder that happens to be good on other points as well?
 

Let's just ask the question this way: what's the grind retention like, in your favorite grinder?

This is a non-espresso question, and the point at issue is grinding multiple coffees (for various brewing methods) without cross-talk.

Think of it this way: If I serve a decaf to someone after serving a non-decaf to someone else, what will be the upshot for the decaf drinker?

Given some of the retention figures I've seen, this is not a trivial question.

For my purposes, purging or other methods are not practical. This is just "which grinder retains the least."

Anyone?
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,854
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 Mon Jul 29, 2013, 2:51pm
Subject: Re: Grind retention: best grinder that happens to be good on other points as
 

Either of my Bunn grinders, a G9 or the LPG have zero retention and they both have two bean hoppers so switching between the two is as easy as flipping a switch.

The dose is controlled by a slide valve allowing beans to drop int the grind chamber. The grinder cotinues to run the grinder for about 15 seconds after the gate closes to clear out any and all beans that are waiting to be ground.  

You can single dose by only putting in your set volume into the hopper and when that is groud, it is ground. The down side of the grinders is that they are set for one grind, in the case of me, drip so to adjust for other brew methods is not such an easy task as on a grinder that is designed for adjustment between batches. It is adjustable, but it takes  a screw drinver and some bending LOL!

 
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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jpender
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jpender
Joined: 11 Jul 2011
Posts: 708
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Mon Jul 29, 2013, 3:55pm
Subject: Re: Grind retention...
 

Hand grinders.

I have casually measured the retention of two hand grinders and they both have low retention, a few parts in a thousand for my typical dose, but not zero. My Kyocera CM-50 (aka Hario Skerton) has typically been in the 0 to 5 centigram range and my OE LIDO usually retains a bit more, maybe 3-7 centigrams. I'm kind of making those numbers up as I haven't really written anything down, only noticed the (bean weight) - (grind weight) difference numerous times. When the burrs are freshly cleaned the retention is temporarily higher, so there is probably always a small amount (0.1g?) of old coffee stuck in there, hopefully not causing any problem. Occasionally the grind retention will be slightly negative. This is either a scale error or some retained material from the previous grind subsequently falling out.

When I first got my OE LIDO the retention was very unpredictable. Then I noticed bean fragments on the floor that had popped out of the top, so I added a lid.
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Mon Jul 29, 2013, 5:45pm
Subject: ...
 

...
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emradguy
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emradguy
Joined: 31 Mar 2011
Posts: 3,163
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4, Pharos,...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Mon Jul 29, 2013, 7:23pm
Subject: Re: Grind retention...
 

Yeah, my Lido was the first grinder I thought of, though my Macap is pretty darn good too (except one needs to brush it out and it's espresso only).

 
.
Always remember the most important thing is what ends up in your cup!
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jpender
Senior Member
jpender
Joined: 11 Jul 2011
Posts: 708
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Mon Jul 29, 2013, 7:50pm
Subject: Re: Grind retention...
 

Netphilosopher Said:

Weird about popcorning of bean fragments.  I get it rarely now, but did early on in my LIDO.  How much do you grind at a time?

Posted July 29, 2013 link

22 grams is my magic number. I wonder if lighter roast / harder beans contributes to popcorning?

I have noticed that some coffees are a little stickier or more static-prone and that increases the retention slightly. The way the dust sticks to the adjustment mechanism and that cave-like area below the burrs is the one thing I dislike about the LIDO. It's not a lot of dust in terms of coffee mass but it's messy. It's a messy design which I'm assuming OE is now fixing.
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Tue Jul 30, 2013, 4:15am
Subject: ...
 

...
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GlennV
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Joined: 27 Oct 2011
Posts: 29
Location: UK
Expertise: I love coffee

Posted Wed Jul 31, 2013, 1:42pm
Subject: Re: Grind retention: best grinder that happens to be good on other points as
 

calblacksmith Said:

Either of my Bunn grinders, a G9 or the LPG have zero retention and they both have two bean hoppers so switching between the two is as easy as flipping a switch.

Posted July 29, 2013 link

What's the trick? Great grinder though it is, my LPG holds back a gram or two behind the flaps, and if I remove the flaps the grinds fly everywhere.
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