[Homeroast] Poisson's ratio WAS: Re: Compak vs Macap vs Rocky Grinders

Ryan M. Ward silvercro_magnon at hotmail.com
Tue May 18 15:36:08 CDT 2010


Hey, I never met a French fish I didn't like. 

-- 
Ryan M. Ward

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http://www.ubuntu.com

**Note: This signature was placed here by me and is not automatically-generated-annoying-end-of-email-spam placed here by anyone other than myself. I am a Linux nut and am doing my part to support open source software and the Linux and Ubuntu communities by getting the word out with each email I send, I encourage you to do the same.




> Date: Tue, 18 May 2010 09:30:03 -0700
> To: homeroast at lists.sweetmariascoffee.com
> From: sweetmarias at sweetmarias.com
> Subject: Re: [Homeroast] Poisson's ratio WAS: Re: Compak vs Macap vs Rocky	Grinders
> 
> Doesn't this mean "Fish's Law"?
> 
> Are we gonna take our queues from fish now? French fish at that?
> 
> ;-0
> 
> >Engineering is all voodoo anyway ;)
> >
> >--
> >Ryan M. Ward
> >
> >*Note: This email was sent from a computer running Ubuntu Linux 9.10 
> >(Karmic Koala)
> >http://www.ubuntu.com
> >
> >**Note: This signature was placed here by me and is not 
> >automatically-generated-annoying-end-of-email-spam placed here by 
> >anyone other than myself. I am a Linux nut and am doing my part to 
> >support open source software and the Linux and Ubuntu communities by 
> >getting the word out with each email I send, I encourage you to do 
> >the same.
> >
> >
> >
> >
> >>  Date: Tue, 18 May 2010 07:59:46 -0700
> >>  From: theotherjo at gmail.com
> >>  To: homeroast at lists.sweetmariascoffee.com
> >>  Subject: Re: [Homeroast] Poisson's ratio WAS: Re: Compak vs Macap 
> >>vs Rocky	Grinders
> >>
> >>  Mike,
> >>  Nice to hear a human description of a "Natural" force of nature.  We being
> >>  part of nature. Although some would argue I'm not at all natural of this
> >>  earth like my mother who used to ( tongue in cheek I'm sure ) tell friends
> >>  when introducing me as a child that "Joe did not come by stork, there was
> >>  this small shiny ship that landed one night in our neighborhood." Could this
> >>  be why I love Sci fi and this black gold that runs through this list's
> >>  vein's? I did a wiki pedia and some other reading so I would have a clue
> >>  when you and RayO or anyone else shares information on this 'spro tamping
> >>  topic.
> >>  Very interesting and fun now back to my coffee.
> >>  JoeR
> >>
> >>  On Tue, May 18, 2010 at 7:34 AM, Mike Koenig <koenig.mike at gmail.com> wrote:
> >>
> >>  > I'm probably splitting hairs here, but Poisson's effect happens on the
> >>  > molecular level, with bonds elongating under pressure or strain. 
> >>I'm not a
> >>  > geoscience guy, but I imagine the effect effect would happen in rocks,
> >>  > dense
> >>  > clays and shale, etc,  but what you are seeing in a coffee puck is
> >>  > interactions between discrete non-uniform particles.
> >>  >
> >>  > I'm not arguing at all that you don't get some lateral expansion during
> >>  > tamping, since that certainly does happen, but it's not necessarily
> >>  > uniform,
> >>  > and dependent on the distribution (and re-arrangement under force) of the
> >>  > particles, as opposed to poisson's effect, which describes a predictable
> >>  > amount of lateral expansion based on the change axial length.  If the
> >>  > expansion was due to poisson's effect, the puck would spring back when you
> >>  > let go of the tamper.   What you are getting is some re-arrangement of the
> >>  > particles under force (like when you step in sand, and it moves out of the
> >>  > way under your foot).
> >>  >
> >>  > --mike
> >>  >
> >>  >
> >>  >
> >>  > On Tue, May 18, 2010 at 3:01 AM, <raymanowen at gmail.com> wrote:
> >>  >
> >>  > > Then I don't know why the grounds would press out and seal against the
> >>  > > sides
> >>  > > of the basket when you are only applying axial force with the tamper.
> >>  > > Hydrostatic?
> >>  > >
> >>  > > I hope I don't owe a refund of all our pay at the Geophysics Research
> >>  > > Institute at CSM. Please don't tell Dr. Levent Ozdemir or Dr. 
> >>Russ Miller
> >>  > > we
> >>  > > were doing bad oil shale research. Damn!
> >>  > >
> >>  > > What supports you when you walk on a sandy beach?
> >>  > >
> >>  > > Teach me, please. -ro
> >>  > > _______________________________________________
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> >>
> >>
> >>  --
> >>  Ambassador for Specialty Coffee and palate reform.
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