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

Ryan M. Ward silvercro_magnon at hotmail.com
Tue May 18 11:14:55 CDT 2010


Engineering is all voodoo anyway ;)

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Ryan M. Ward

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> 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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