How's my puck’s headspace?

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pcrussell50
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Joined: March 1st, 2009

Postby pcrussell50 » Apr 16, 2018, 11:21 am

How does this headspace imprint look? A little bit of the center screw. None of the imprint of the grid from the shower screen.
Image

Or should there be some of the imprint from the screen as well?

The extraction was nice and even as viewed under the bottomless, though a little bit fast. Next one will tighten the grind.

-Peter
LMWDP #553

Prescott CR
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Joined: May 30th, 2015

Postby Prescott CR » Apr 16, 2018, 3:46 pm

Looks fine really. It's nice and dry?

If you're thinking the screen imprint should be there as well try adding another .5gm dose but - if it tastes good and comes out clean why bother?

Sometimes if you grind a LOT finer you'll be able to fit enough more in the basket that it's worth kicking it up a gram, but if you're just nudging your grinder a little I wouldn't worry about it.
-Richard

BaristaBob
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Joined: November 4th, 2017

Postby BaristaBob » Apr 16, 2018, 4:00 pm

pcrussell50 wrote:How does this headspace imprint look? A little bit of the center screw. None of the imprint of the grid from the shower screen.
<image>

Or should there be some of the imprint from the screen as well?

The extraction was nice and even as viewed under the bottomless, though a little bit fast. Next one will tighten the grind.

-Peter


It looks course and very dry...was this ground using your HG-1 or Vario?
Bob "hello darkness my old friend..."

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kolu
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Joined: June 4th, 2013

Postby kolu » Apr 16, 2018, 4:26 pm

you should check the headspace before extraction, not after.

Tonefish
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Joined: June 26th, 2017

Postby Tonefish » Apr 16, 2018, 7:37 pm

I use the NIckel test recommended here.How to evaluate puck to shower screen distance? Just used it today, in fact, after receiving some new VST baskets. Thumbs Up!

Puck dryness depends significantly on how long it's been since extraction and other variables so it doesn't really tell you about headspace even though large headspace will start the dryout wetter, and, except for the imprints which I have never heard used as a gauge.
LMWDP #581 .......... May your roasts, grinds, and pulls be the best!

pcrussell50
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Joined: March 1st, 2009

Postby pcrussell50 » Apr 17, 2018, 1:11 pm

I'm aware of the nickel test only there's a "complication"... I'm also experimenting with not tamping: RDT/grind/WDT/spin one of those distribution tools, (depth-set to my best guess at what the headspace ought to be)/lock/pull.

I feels as if, if I add tamp to the same dose mass, it will increase head space.

BaristaBob wrote:It looks course and very dry...was this ground using your HG-1 or Vario?


It probably looks dry because the photo was taken at least ten minutes after the shot. As for the coarseness, I can't comment. It was ground with Vario with flapper mod (very very fluffy, clump-free grind pile). I've never done much post-shot forensics, (own weakness) but I can imagine that as the shot progresses, the mix of grind sizes will segregate the same way a bag of chips does, where the smaller pieces make their way to the bottom. That shot was a little fast and could/should have been a little tighter.

-Peter
LMWDP #553

Tonefish
Posts: 630
Joined: June 26th, 2017

Postby Tonefish » Apr 17, 2018, 3:19 pm

pcrussell50 wrote:I'm aware of the nickel test only there's a "complication"... I'm also experimenting with not tamping: RDT/grind/WDT/spin one of those distribution tools, (depth-set to my best guess at what the headspace ought to be)/lock/pull.

I feels as if, if I add tamp to the same dose mass, it will increase head space.
-Peter

Those other techniques you are trying should still support a nickel unless your distribution tool isn't set deep enough.
LMWDP #581 .......... May your roasts, grinds, and pulls be the best!

BaristaBob
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Joined: November 4th, 2017

Postby BaristaBob » Apr 17, 2018, 3:38 pm

pcrussell50 wrote:I'm aware of the nickel test only there's a "complication"... I'm also experimenting with not tamping: RDT/grind/WDT/spin one of those distribution tools, (depth-set to my best guess at what the headspace ought to be)/lock/pull.

I feels as if, if I add tamp to the same dose mass, it will increase head space.



It probably looks dry because the photo was taken at least ten minutes after the shot. As for the coarseness, I can't comment. It was ground with Vario with flapper mod (very very fluffy, clump-free grind pile). I've never done much post-shot forensics, (own weakness) but I can imagine that as the shot progresses, the mix of grind sizes will segregate the same way a bag of chips does, where the smaller pieces make their way to the bottom. That shot was a little fast and could/should have been a little tighter.

-Peter


Hey Peter,
I've been experiencing with no tamping as well. Since we operate the same machine, you have one of those "razor" gizmos like I do. Its preset depth is close to 9mm. I set my distribution tool for this same depth...worked okay, but seeing some signs of surface disruption, holes, etc., though time, amount in the cup, and flavor is all good. Today moved tool to 10mm, think this might do the trick. Time will tell.
BTW...yes, your grinds are very fluffy indeed.
Bob "hello darkness my old friend..."

pcrussell50
Posts: 693
Joined: March 1st, 2009

Postby pcrussell50 » replying to BaristaBob » Apr 17, 2018, 3:58 pm

LOL, I don't even know where my razor/scraper distributing tool is. I've never used it even once.

Now, 10mm, that's 1cm or about the width (give or take) of your pinky finger. That sounds awfully deep, if by that you mean a full 10mm down from the rim of the basket, or the shiny metal part of the tool, the part that fits down into the basket, protruding 10mm out from the black "handle", which rides on the rim of the basket. That sounds awfully deep, unless I'm not correctly visualizing where we are taking the 10mm measurement from.

-Peter
LMWDP #553

BaristaBob
Posts: 312
Joined: November 4th, 2017

Postby BaristaBob » replying to pcrussell50 » Apr 17, 2018, 4:38 pm

Okay, a picture is worth a thousand words. That's my pinky finger. And, I do have my razor, but never have used it except to check head space every now and then.

Image
Bob "hello darkness my old friend..."