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Beans not catching in flat burr grinder in cool conditions
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Burner0000
Senior Member


Joined: 28 Jul 2011
Posts: 1,090
Location: Cambridge, Ontario Canada
Expertise: Professional

Espresso: Rancilio Silvia, VFA Expres...
Grinder: Macap MX/VFA N1464/Kyocera...
Drip: Manual Drip, French Press
Roaster: Behmor 1600 / Sonofresco
Posted Wed Sep 25, 2013, 10:20am
Subject: Beans not catching in flat burr grinder in cool conditions
 

So the last few nights have gotten pretty cold here in ONT.. Our house is rather old and drafty.  Last night the temp dropped to around 60'F maybe lower in the house.  When it gets this cold I notice my grinder has a hard time catching beans when I attempt to small dose.  Has anyone experienced this problem?  I usually have to either kick on the heat and wait 5-10 min or grinder course and bring the burrs back down.  Maybe there may be some coffee left in the shout up in the corners from the last grind.  Could this stop grinding coffee flow?

Grinder: Macap MX
Burrs: flat 65mm almost new
Damage? None
Roast: El Salvador FC
Cleaning: Burrs are cleaned whenever I use a different roast of coffee. at least once per month.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,864
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 Wed Sep 25, 2013, 10:58am
Subject: Re: Beans not catching in flat burr grinder in cool conditions
 

Wow, that is weard.

Metal does move with temp but burrs are so small that even with very large temp swings, you will not see more than a thousandth of an inch movement in them then it takes longer than your time frame to warm back up as they are inside the machine and the heat needs to get to them, say half an hour or so. But then, when single dosing the burrs will be open to the air.... IDK.

I know I have had grinders that did not want to single dose well, they would be OK with a hopper of beans but they had a hard time when the burrs were empty to start.

The beans are more exposed to temp than the burrs are I wonder if it has anything to do with them. As there are really only three variables, the temp, the grinder and the beans, next time try warming up only the beans. If there is still a feed problem then  suspect the grinder. If they feed properly then it seems to be something with the beans. When the temp changes and they both change together, you don't know which of the two is having an issue.

 
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Burner0000
Senior Member


Joined: 28 Jul 2011
Posts: 1,090
Location: Cambridge, Ontario Canada
Expertise: Professional

Espresso: Rancilio Silvia, VFA Expres...
Grinder: Macap MX/VFA N1464/Kyocera...
Drip: Manual Drip, French Press
Roaster: Behmor 1600 / Sonofresco
Posted Wed Sep 25, 2013, 11:18am
Subject: Re: Beans not catching in flat burr grinder in cool conditions
 

Yeah maybe it's not the greatest single doser. I'm gonna throw the beans in a cupboard in another area where it's warmer to rule that out.  My set up is surrounded by windows and a drafty door.

I have been drinking darker roasted coffee lately... Maybe I have some oily residue on the burrs too.. I usually clean my grinder by running some instant rice through it.
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Burner0000
Senior Member


Joined: 28 Jul 2011
Posts: 1,090
Location: Cambridge, Ontario Canada
Expertise: Professional

Espresso: Rancilio Silvia, VFA Expres...
Grinder: Macap MX/VFA N1464/Kyocera...
Drip: Manual Drip, French Press
Roaster: Behmor 1600 / Sonofresco
Posted Wed Sep 25, 2013, 12:08pm
Subject: Re: Beans not catching in flat burr grinder in cool conditions
 

Just realized that I haven't brushed the burrs ever.. They are only a few months old but I bet there's a bunch of oil in there... I will do so tonight and see if we get any difference.
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Burner0000
Senior Member


Joined: 28 Jul 2011
Posts: 1,090
Location: Cambridge, Ontario Canada
Expertise: Professional

Espresso: Rancilio Silvia, VFA Expres...
Grinder: Macap MX/VFA N1464/Kyocera...
Drip: Manual Drip, French Press
Roaster: Behmor 1600 / Sonofresco
Posted Sun Sep 29, 2013, 8:17am
Subject: Re: Beans not catching in flat burr grinder in cool conditions
 

So after cleaning the burrs I still have the same problem. Could be a variety of things but dirty burrs aren't one of them.  I have found so far that if I don't single dose it seems to work fine.  I think the climate (dry cool air) in my house combined with ehatever is left behind on the burrs are causing the issue.  I will just dose by grind not bean.
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