I've been trying to figure out why random shots with my naked portafilter spray all over even though most shots run through perfectly. I weigh my beans and use a Thor Ridgeline to tamp, so I should have very repeatable results. Today I pulled two shots back to back. The first one sprayed all over, the second was perfect. Same beans, same weight, same grind, same tamp. I am beginning to wonder about the effect of small bits of chaff that remain after I roast. I sometimes see bits of chaff sticking to the inside of the basket after I weigh the beans. I haven't done a definitive data collection, but I'm now wondering if the shots that spray have bits of chaff causing channeling and spray while the perfect shots have no chaff bits. Has anyone else noticed this? Homeroast mailing list Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20
I've long suspected the same cause and effect with regards to chaff. While I have nothing but observed data to support my conclusion, my thoughts are that chaff has different grinding and water absorption properties from the bean which causes the difference of water percolation through the portafilter.
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I'd re-state that to "distribution matters much more than tamp". In fact, tamping is the least important part in building a shot. Even further well distributed builds with NO tamp at all will be with no channeling. Few days ago was working a rush at the café and forgot to tamp a shot! No channeli= ng at all, and I'd have known immediately since all shots pulled nekkid. As far as chaff causing channeling, don't rightly know. Kona Konnaisseur miKe mcKoffeehttp://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must">http://www.NorwestCoffee.comURL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must first not know. And in knowing know I know not. Each Personal enlightenment found exploring the many divergent foot steps of Those who have gone before. Pacific Northwest Gathering VIIhttp://themeyers.org/HomeRoast/=">http://home.comcast.net/~mckona/PNWGVII.htmSweet Maria's List - Searchable Archiveshttp://themeyers.org/HomeRoast/= <Snip> <Snip> <Snip> <Snip> <Snip> <Snip> <Snip> Homeroast mailing list Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee=.com Homeroast community pictures -upload yours!) :http://www.sweetmariascoffee=.com/gallery/main.php?g2_itemId=7820
<Snip> I weigh my beans in the baskets before grinding, so some small bits of chaff often stick to the sides of the basket after I dump the beans into the grinder and don't get ground up. I didn't think it mattered to the taste, so I haven't been wiping them out, but now think I should do that each time as that may be the cause at least in part. Some bits also stick to the stainless steel funnel I use to transfer the grinds into the baskets, so I'll have to be more careful to keep those out of the baskets too. I'll also pay more attention to the pre-tamp distribution although I think I do get the grounds in pretty evenly using the funnel. Thanks Mike and MiKe! Homeroast mailing list Homeroasthttp://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comHomeroast community pictures -upload yours!) :http://www.sweetmariascoffee.com/gallery/main.php?g2_itemIdx20