HomeRoast Digest


Topic: USRC half Kilo (6 msgs / 156 lines)
1) From: Les
My new roaster is in Salt Lake City this morning!  It is suppose to be in
Roseburg on Wed.  I might be too sick to go to work on Thursday!  No, I
wouldn't do that.  The bummer is somebody scheduled me to work this
weekend.  Oh yeah, that was me!  The problem of being the boss and being on
Salary.  I will benefit by having next Tuesday and Wednesday off.  So there
should be a lot of roasting and tamper making done on those two days!  I
don't know, I am drinking an awfully fine Behmor roasted Indonesian as I
type.  I am looking forward to having total control.  All of you lurkers who
have mentioned getting small commercial roasters should start posting some
profiles for us newbies.
Les

2) From: Brian Kamnetz
Hi Les,
I think I am understanding the advantages of your new roaster, but let
me post my understanding and see if I am understanding this correctly.
Both the Behmor and your new roaster have a maximum capacity of about
a pound. But your new roaster allows you to more precisely control the
rise in temp over specific time. Is that close?
If that is correct, can you tell us the mechanism (including method of
producing heat) for controlling temp rise over specific time? Does it
have instruments similar to PID (which I only vaguely understand, so
it's probably not the best example for me to use)?
Thanks,
Brian
On Feb 4, 2008 11:07 AM, Les  wrote:
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3) From: John Despres
Congratulations, Les! I enjoy the control and freedom my Gene Cafe 
allows me. You will have a blast. Keep us posted as how things work out!
John
Les wrote:
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-- 
John A C Despres
Hug your kids
616.437.9182
Scene It All Productions 
JDs Coffee Provoked Ramblings

4) From: miKe mcKoffee
Not Les here but that was once my dream machine so have researched it. (and
jumped past it:-) Les's commercial USRC 1 pounder uses variable gas valving
for heat control and IIRC variable fan speed and dampers for air flow
control combined with environment and bean mass temp monitoring. (Our 8
pounder can vary air flow from 0 to 100% in 1% increments) Changing target
temp set points during the roast also controls heat applied (Burner will
turn off when target reached regardless valve setting).  If/when temp drops
below target or target temp raised burner re-ignites at your chosen valve
setting, valve setting can of course be changed on the fly. Les did not go
with any roast automation options like we did with our 8 pounder so changes
done manually. And a big plus for monitoring roast development and sampling
various roast stages along the way, has tryer. If it behaves anything like
our 8 pounder will actually be able to do 1 pound roasts in ~15min or under
without tipping or scorching. 
Of course could get about 10 Behmors for the same price. However, the USRC 1
Pounder can be expected to last a lifetime. Apples and oranges.
Kona Konnaisseur miKe mcKoffeehttp://www.mckoffee.com/Ultimately the quest for Koffee Nirvana is a solitary path. To know I must">http://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.
Sweet Maria's List - Searchable Archiveshttp://themeyers.org/HomeRoast/
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5) From: RK
This is a multi-part message in MIME format.
Les please post some pictures when you get it set up.
RK

6) From: raymanowen
P- proportional, the further the process (roasting, brewing temperature) is
from the setpoint (desired) temperature, the greater the quantity of heat
commanded-
I - integral, the quantity (electric or fuel used to produce) heat added
compared to the temperature change produced-
D- differential, how rapidly is the temperature actually changing-
With the advent of integrated circuit operational amplifiers having enormous
gain in a single, stable part, all of these transcendental math functions
are feasible in a small low power package, instead of a room full of
thousands of vacuum tubes with their heaters- filaments, drawing a watt or
two each, all within large air conditioned cabinets.
What have we all had to learn about roasting? Heat stays, even when you no
longer need it and especially when you don't want it at all!
How would you like to have a movie theater full of electronics combining
vacuum tubes and discrete solid state devices to control a single roaster-
or flight simulator? The young troops didn't understand electron flow, and I
thought holes were an empty concept.
With IC's, it's an easy transition from a flow chart to circuit design- you
don't need a civil engineer to design a whole superstructure and HVAC
equipment to tame a digital remote control or a PID controller.
Cheers -RayO, aka Opa!
Got Grinder?
On Feb 4, 2008 9:48 AM, Brian Kamnetz  wrote:
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