NobbyR Senior Member Joined: 10 Jul 2011 Posts: 1,661 Location: Germany Expertise: I love coffee
Espresso: Poccino Opus One, Ariete Grinder: Eureka Mignon Istantaneo,... Vac Pot: N/A Drip: Melitta Linea Unica de Luxe Roaster: N/A
Posted Sat May 19, 2012, 1:37am Subject: Re: Extraction question
emradguy Said:
With the wide steps of the Rocky, you will sometimes find you need to be between grind settings. This is overcome by altering dose, rather than tamp pressure ...
emradguy Senior Member Joined: 31 Mar 2011 Posts: 1,795 Location: Houston Expertise: I live coffee
Espresso: Izzo Alex Duetto II Grinder: MacapM4T, Macap M4, OE Lido,... Drip: Espro press; Aeropress Roaster: internet
Posted Wed May 30, 2012, 7:24am Subject: Re: Extraction question
once again, if you're "correct" setting for grind is between steps, you'll have to adjust dose...and you may have to work on grounds distribution
Changing your tamp pressure is not useful. You'll never tamp at the pressure the water comes through the group (about 140 pounds), so changing from 20 to 60 (or some other number in between) isn't going to do squat, other than make you more likely to fracture the puck in the basket (thereby increasing your risk of channeling). Best tamping results are to pick something comfortable and do it the same all the time. Just make sure the tamper fits the basket, and you're keeping it level.
Posted Wed May 30, 2012, 7:39am Subject: Re: Extraction question
emradguy Said:
once again, if you're "correct" setting for grind is between steps, you'll have to adjust dose...and you may have to work on grounds distribution
Changing your tamp pressure is not useful. You'll never tamp at the pressure the water comes through the group (about 140 pounds), so changing from 20 to 60 (or some other number in between) isn't going to do squat, other than make you more likely to fracture the puck in the basket (thereby increasing your risk of channeling). Best tamping results are to pick something comfortable and do it the same all the time. Just make sure the tamper fits the basket, and you're keeping it level.
Your correct. Stay with my current tamp pressure. The tamper could be issue. When i got machime chris coffee sent me their tamper and it surely doesnt seem to fit my basket as close as i had thought. I will look into that and plan to pick up a gram scale
emradguy Senior Member Joined: 31 Mar 2011 Posts: 1,795 Location: Houston Expertise: I live coffee
Espresso: Izzo Alex Duetto II Grinder: MacapM4T, Macap M4, OE Lido,... Drip: Espro press; Aeropress Roaster: internet
Posted Wed May 30, 2012, 8:13am Subject: Re: Extraction question
if you don't have an accurate way to measure what size you really need, and can spare a basket for a while, Reg Barber does custom fit tampers. You send in a basket and they sell you an exact fit base. They offer aluminum, stainless steel, brass and copper. and each comes in various surfaces (flat, curved, more curved, ridged, angles at the edge, and a couple of combos). They also do handles in wood and aluminum (with/without powder coat), and you can get custom engraving too. Not trying to do a sales ad, but I've been really happy with their stuff. People say you should try to get a tamper that matches the shape of your shower screen, but I really don't think it matters (certainly, no one has a screen with ridges).
Posted Thu May 31, 2012, 6:04am Subject: Re: Extraction question
Picked up a scale and started to measure my doses. First one was 19g.. Worked pretty good. Then somehow my next 3 were 21g after switching to new bag of beans roasted on 3/22. So i guess my target is 18-19g?
emradguy Senior Member Joined: 31 Mar 2011 Posts: 1,795 Location: Houston Expertise: I live coffee
Espresso: Izzo Alex Duetto II Grinder: MacapM4T, Macap M4, OE Lido,... Drip: Espro press; Aeropress Roaster: internet
Posted Thu May 31, 2012, 8:32am Subject: Re: Extraction question
In my mind, dose weight should be mostly decided by taste, with adjustments made to grind fineness to achieve the desired extraction time (also decided by taste). I know that's complicated, but the recommendation is to do a taste test exercise using different dose weights (preferably side by side). First you figure out your end point. Get your shot extraction in the apparent desired range (e.g., 22-28 seconds). Then taste the extraction as it drips out of the portafilter (rapid successions of tiny tastes with a small spoon). Once you get a good idea when the extraction is finished, pull your shots at the varied weights and try them side by side to see which you like best.
This gets you a long way, and you certainly can stop there, knowing you've got shots that taste great to you. However, you can also take it a step further and make tiny grind adjustments to see whether you like ristretto, normale, or lungo extractions.
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