HomeRoast Digest


Topic: Great Idea (20 msgs / 501 lines)
1) From: Gary Raabe
Whether we roast with Poppers, HG/DB, SC/TO, I-Roast, Gene Cafe, or Hottop =
we ALL want to know bean temperature. In fact, I am becoming increasingly c=
onvinced the ultimate gauge and/or tool for roast profile and doneness is b=
ean mass temperature.
 =
Most of the roast appliances give us some kind of temperature readout but i=
t is never bean mass temperature, it’s always some air temp. whether it=
’s incoming or outgoing. While we can figure a way to snake a T/C into so=
me roast devices, there are some that are impossible like the Gene or Hotto=
p.
 =
Here’s my great idea, take the miniature transmitter technology of the =
“Pet ID Chip” and combine it with a T/C. Wouldn’t it be great to have=
 a Stainless Steel T/C “Bean” that transmits a temperature signal? Just=
 put the pill-sized (or coffee bean sized) bean in with your batch and watc=
h a remote readout that displays the current bean mass temp.
 =
Anybody out there with a couple of million $ for development funding?
Gary Raabe
Cincinnati OH
Earn cashback on your purchases with Live Search - the search that pays you=
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2) From: Jack Rogers
I think I've seen that idea already, but can't remember where.  I don't even
remember if it was coffee-related.
I'd end up grinding mine and pulling a shot from it!
Jack
On Mon, Jun 23, 2008 at 3:02 PM, Gary Raabe 
wrote:
<Snip>
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3) From: David Martin
Gary -
That's a great idea, but why did you post it to the mailing list
instead of writing a patent application? :-)
-Dave
On Mon, Jun 23, 2008 at 1:02 PM, Gary Raabe  wrote:
<Snip>
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4) From: miKe mcKoffee
Yup, interesting idea that comes up periodically ala the movie Twister.
Pacific Northwest Gathering VIIhttp://www.mcKonaKoffee.comURL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must">http://home.comcast.net/~mckona/PNWGVII.htmKona Konnaisseur miKe mcKoffeehttp://www.mcKonaKoffee.comURL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.
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5) From: Skydragon454
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6) From: Tom & Maria - Sweet Maria's Coffee
there are a lot of mobile types of thermocouples now ... the ones I 
have seen are put in boxes and shipping containers to monitor 
temperature. I think they write out to flash memory or something, and 
don't transmit. But now in process control applications they use 
transmitting ones quite regularily, i.e. wireless.  It seems that 
there would be many applications where actually having a probe IN the 
batch of material would be ideal - I bet something exists but in high 
tech or in medical/pharmaceutical.
--
                   "Great coffee comes from tiny roasters"
            Sweet Maria's Home Coffee Roasting  -  Tom & Maria
                      http://www.sweetmarias.com                Thompson Owen george_at_sweetmarias.com
     Sweet Maria's Coffee - 1115 21st Street, Oakland, CA 94607 - USA
             phone/fax: 888 876 5917 - tom_at_sweetmarias.com
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7) From: Sean Cary
Gotta be the 3rd time since I joined in '05...
Sean
On Mon, Jun 23, 2008 at 4:46 PM, miKe mcKoffee  wrote:
<Snip>
-- 
Sean M. Cary
Major USMC
Tempus Fugit, Memento Mori
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8) From: Ed Needham
This was seriously discussed a while back.  Some of the issues touched on =
were
-making the 'bean' similar in heat conductivity to a real coffee bean.
-the fact that the heat conductivity of a bean changes drastically =
throughout the roast due to changes in color and moisture, as well as mass.
-finding a transmitter that can withstand 500F+ and some pretty serious =
agitation.
-Oh, and cost.
*********************
Ed Needham
"to absurdity and beyond!"http://www.homeroaster.com*********************

9) From: Rich
Just goes to show that coffee roasting is an art and not a science.
Ed Needham wrote:
<Snip>
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10) From: Paul LaGorce
yes, that's a great idea.  Can we get others to contribute ideas?  Here's
one: There are paint-like materials that change colors at different
temperatures.  Spray can paint a few beans before roasting and when the
paint turns from blue to yellow, you're at your desired temperature.
On Mon, Jun 23, 2008 at 1:02 PM, Gary Raabe 
wrote:
<Snip>
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11) From: peterz
Quick Google brought this.
 >http://filer.case.edu/djy/publications/MEMS2002.pdf<No cost estimate though.
PeterZ
Ed Needham wrote:
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12) From: miKe mcKoffee
<Snip>
Many would disagree and say roasting coffee is an art and a science.
Pacific Northwest Gathering VIIhttp://www.mcKonaKoffee.comURL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must">http://home.comcast.net/~mckona/PNWGVII.htmKona Konnaisseur miKe mcKoffeehttp://www.mcKonaKoffee.comURL to Rosto mods, FrankenFormer, some recipes etc:http://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.
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13) From: raymanowen
*Bean mass temperature*.
Once upon a time there lived a magician named Merlin...
I thought this subject had been archived by the silver dagger. The
instrumented bean would be The Orphan- so far different from every other
bean as to be Totally Useless if you're looking exclusively for an absolute
temperature.
The relative temperature of The Orphan would be no more useful than the
relative temperature indication of any other measurement procedure.
The presumed magic all comes down to this: heat transfer. It occurs because
of contact of the bean with something hot.
The area of contact of a round coffee bean with the inside of a hot roasting
drum is zero. Suppose the bean contacts the drum at three points [it can't,
but we're talking magic!] The area of contact is 3 X 0 = 0. Still zero
contact. No heat transfer, because it has no area of contact.
The beans get hot for the same reason the drum gets hot, not because the
drum is hot.
Measure the first cause or whatever works for you.
Cheers, Mabuhay -RayO, aka Opa!
Got Grinder?
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14) From: Coffee
Yes, art and science...
I think I first read it in a book by Ansel Adams, that one must  
diligently study the craft (science) in order to produce art. If you  
have a desired outcome in your art, you won't be able to achieve it  
without a thorough understanding of your craft.
-Peter
On Jun 23, 2008, at 9:58 PM, miKe mcKoffee wrote:
<Snip>
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15) From: Ed Needham
...and a craft.  We are multi-talented individuals!
*********************
Ed Needham
"to absurdity and beyond!"http://www.homeroaster.com*********************

16) From: Ed Needham
Some roasters have had great success measuring the 'last' step, or the 
roaster exhaust temperature as a reliable method of gauging progress of the 
roast.
I think it has some merit.
*********************
Ed Needham
"to absurdity and beyond!"http://www.homeroaster.com*********************

17) From: Bill S.
..A clever idea; lots of design issues; i.e., heating a small battery to
500F?  The density of the SS bean would have to approximate a coffee bean
otherwise it would migrate to the bottom or top of the beans in the roasting
chamber. It would have to transmit through a metallic drum in most
applications.
..and don't run it through your Mazzer!
On Tue, Jun 24, 2008 at 12:49 AM, peterz  wrote:
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18) From: Stan Klonowski
Why not just place the thermocouple in a bean? It could probably be done
with a small drill bit, a pin vise and the TC.
Stan
2008/6/25 Bill S. :
<Snip>
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19) From: raymanowen
500° F battery? I remember reading about them in the 50's. Incorporate a
Thermopile* into the design of your roasting drum. The voltage output of the
Thermopile* will rise and fall with the changing temperature of its
environment, just like a thermocouple.
*[A thermopile is actually several thermocouples connected in series]
A thermocouple and mil spec'd A/D converter could be powered by the
thermopile to drive an LED with a real time digitally encoded signal. All
the wiring would be fixed in position and connect to an axially oriented LED
in the hollow drive shaft.
Many different thermocouples could have their data multiplexed to the
digital data stream, optically fed out to a fixed detector. A speckless
clean wireless signal.
Cheers, Mabuhay, iechyd da -RayO, aka Opa!
-- =
"When the theme hits the bass, I dance the Jig!" - -Virgil Fox at the Mighty
Wichita (ex- NYC Paramount) WurliTzer- 1976
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20) From: R Nepsund
Thermocouple's require a temperature drop accross it to make electricity.
On Wed, Jun 25, 2008 at 11:10 AM, Stan Klonowski 
wrote:
<Snip>
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