HomeRoast Digest


Topic: OT +Silvia-to PID or not to PID?>>>Neither! (3 msgs / 62 lines)
1) From: Kevin
Forgive me for reviving a dead thread but I was thinking about this this for
a while: SMP espresso suitability issue. Wouldn't the shear stress of the
coffee beans exposed to the burr at any one point vs. the elasticity of the
steel burr have a greater effect on grind consistency than any flexibility
in the nylon housing? Also, the nylon in my SMP looks like it is probably
UHMW (Ultra High Molecular Weight) Polyethylene (relatively inexpensive
material commonly used in mfg lines and equipment) which I would assume to
be of greater rigidity (even if it's cheap nylon this should be true) than
the shear stress of roasted coffee beans (which is the key factor here). Any
flex here I assume to have a negligible effect on particle size ( i.e.
elasticity threshold of housing is much greater than the shear stress of the
roasted coffee beans). The only way to truly determine this is with an
industrial particle size analyzer but that'll never happen. My hypothesis is
that the housing in the SMP would have no noticeable effect on grind
consistency vs. a grinder with a steal housing and both would be suitable
for good espresso.
Any ME's with input?
-- 
Kevinhttp://www.funnyhub.com/videos/pages/snl-more-cowbell.html">http://homecoffeeroastblog.blogspot.com/"I got a fever and the only prescription... is more cowbell!"http://www.funnyhub.com/videos/pages/snl-more-cowbell.html

2) From: Justin Marquez
On 12/1/06, Kevin  wrote:
<Snip>
I am but a ChE and relatively unversed in such mechanical matters
(being a glorified plumber...), BUT it does seem to me that if we can
safely munch a roasted bean that the shear strength of the bean itself
is unlikely to pose any significant issues for either a steel or a
nylon mounting, assuming of course that reasonable "beef" is put into
the making of said housings.
Safe Journeys and Sweet Music
Justin Marquez (CYPRESS, TX)

3) From: Kevin
Justin,
I have to agree with you.  I can't see there being enough flexibility in the
housing to make a noticeable difference in particle size considering the
physical properties of the materials involved.  Possibly a durability issue
over 1000's of duty cycles but that's another issue (and most likely
insignificant as well).
On 12/1/06, Justin Marquez  wrote:
<Snip>
-- 
Kevinhttp://www.funnyhub.com/videos/pages/snl-more-cowbell.html">http://homecoffeeroastblog.blogspot.com/"I got a fever and the only prescription... is more cowbell!"http://www.funnyhub.com/videos/pages/snl-more-cowbell.html


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