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Double shot - tamp line
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j123
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Joined: 15 Sep 2009
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Location: US
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Posted Tue Jun 26, 2012, 5:58am
Subject: Double shot - tamp line
 

Hello

I have a silvia and I'm curious where the tamped puck height should be. Currently I grind into the basket, tap lightly to distribute, add some more grounds, then level with a straight edge.

When I tamp, I am about even with the top of the ridge line. When I put the portafilter in the machine, there is an indention where the screw is.

Thanks
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calblacksmith
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Espresso: ECM Vene. A1, La Cimbali M32
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Posted Tue Jun 26, 2012, 6:33am
Subject: Re: Double shot - tamp line
 

If the screen screw leaves an imprint on the puck before pulling the shot, your level is too high, you should be able to get a dime to nickle between the screen and the coffee.

Use a scale to establish your coffee dose, your method causes lots of difference between shot to shot and consistency just will not be there.

 
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Wayne P.
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emradguy
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emradguy
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Posted Tue Jun 26, 2012, 8:18am
Subject: Re: Double shot - tamp line
 

^+1

Until you get a scale, try filling your basket, without tapping and adding more grounds.  Then level it and tamp as otherwise normal.  Then do the nickel/dime test as Wayne suggested (above).  You should be pretty close to where you ought to be on a Silvia (assuming you're using OEM pf and baskets).  Adjust your grind fineness to achieve the desired extraction time.

 
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Always remember the most important thing is what ends up in your cup!
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j123
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Joined: 15 Sep 2009
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Location: US
Expertise: Just starting

Posted Tue Jun 26, 2012, 8:55am
Subject: Re: Double shot - tamp line
 

Thank you for the replies. To be clear, the screw extends past the screen by a couple coins thickness. Should the puck just touch the screw, which would be a couple coins thickness from the screen or should a dime fit between the puck and screw which would be a decent amount of space between the puck and screen?

I do have a scale. Earlier on I weighed out 14 grams but that always seemed to create a fairly high tamped puck. It is the oem double basket

Thanks
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tracerbullet
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tracerbullet
Joined: 13 Feb 2012
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Location: Saint Paul
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Posted Tue Jun 26, 2012, 1:39pm
Subject: Re: Double shot - tamp line
 

Strange setup. Looking online for pics I see what you mean.

I would say you need to just avoid touching the screen. For most folks the screw head is perhaps a mm, if that, beyond the screen. So saying not to touch it and not to touch the screen are sort of interchangeble. Pics of some Silvias do show a very oversized screw / bolt in that area, big enough that you could get a wrench onto it. In this case I believe the screen is fundamentally what your'e trying to avoid.

Some of those pics brought up online are from people converting that bolt to a screw. Makes snese to me, once you've packed / tamped the coffee into the portafilter, I can't imagine wanting to jam a hole into it like that. Seems like a great way to undo what you've done and get the water channeling through the grounds unevenly.
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