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CheapBastid
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Posted Wed Dec 5, 2012, 9:21am
Subject: Magnestir as a component of ComfortBrew™
 

I seem to be in a creative mood recently around coffee.  I appear to have re-invented the French Pull method (sadly to discover that Trudeau already made the Tirra).  Now I've come up with the idea of using a Magnetic Stir device while doing room temp brewing (I'm partial to calling it ComfortBrew™).  

=)

I picked up an ancient Magnestir S8290 for cheap to use it with my recent foray into Molecular Cuisine and I thought it might help to get more extraction while my grounds are sitting in tepid water.

I've set up a Bodium french press with cheap coffee (Roast2Coast Columbian in a drip grind) using Netphilosopher's 15% ratio for the 60g of coffee.  An interesting side effect is the old motor of the Magnestir heats up as it runs, so the slurry is being warmed to over 106 degrees (only have an oral thermometer).

The experiment is currently running in my kitchen (it's got about 7 hours worth of time on it) and I took the tiniest of pours to see how it's going.  Surprisingly it's not bitter (like I thought it would be) and adding a splash of H&H (I know, I'm a heathen) it has left me with a very nice aftertaste in my mouth.

Anyone else experiment with disturbing the grounds while doing desktop extraction?
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frcn
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Posted Wed Dec 5, 2012, 9:45am
Subject: Re: Magnestir as a component of ComfortBrew™
 

CheapBastid Said:

...  An interesting side effect is the old motor of the Magnestir heats up as it runs, so the slurry is being warmed to over 106 degrees (only have an oral thermometer).

Posted December 5, 2012 link

Thank goodness!

 
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Netphilosopher
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Posted Wed Dec 5, 2012, 10:27am
Subject: ...
 

...
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CheapBastid
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Posted Wed Dec 5, 2012, 11:11am
Subject: Re: Magnestir as a component of ComfortBrew™
 

Netphilosopher Said:

But, maybe the combined constant agitation, slight warming WILL.  Do you have a control brew going at the same time?

Posted December 5, 2012 link

Not this round, I just thought I'd give it a try as I expected it to be a disaster.

Next round I was thinking of using a static tabletop control/contrast with 'good' beans against the Magnestir 'office' beans and see which one was 'better' (both at 15%).  

I was also thinking I might go with a 10% ratio as I'm guessing I'm losing a bit to evaporation as the Magnestir is warm (I'm guessing it's at about 110°ish).
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CheapBastid
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Posted Wed Dec 5, 2012, 11:18am
Subject: Re: Magnestir as a component of ComfortBrew™
 

Another aspect that occurs to me is that the magnetic stir bar might be 'wet grinding' the fines as it's 'scraping' against the glass on the bottom as it spins.  Although with the turbulence it may just be spinning them out to the edges.
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dyqik
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Posted Wed Dec 5, 2012, 11:35am
Subject: Re: Magnestir as a component of ComfortBrew™
 

I doubt the bar would grind the coffee at all, the force holding it to the bottom of the flask is pretty low.  Certainly nothing like the force involved in a (blunt) burr grinder.
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yakster
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Posted Wed Dec 5, 2012, 12:29pm
Subject: Re: Magnestir as a component of ComfortBrew™
 

I've been meaning to make a cheap magnetic stirrer (Instructables.com) from a computer fan for extracting coffee in Tequila but I haven't got around to it yet.

 
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CheapBastid
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Joined: 3 Dec 2012
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Posted Wed Dec 5, 2012, 12:55pm
Subject: Re: Magnestir as a component of ComfortBrew™
 

yakster Said:

I've been meaning to make a cheap magnetic stirrer (Instructables.com) from a computer fan.

Posted December 5, 2012 link

Looks awesome!  If you read down the comments another person set it up so it could be run from USB, also a pot on the line to change speed would be a great addition.  If I didn't have a $20 Magnestir already I'd start hacking away!
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Netphilosopher
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Posted Thu Dec 6, 2012, 6:04am
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