HomeRoast Digest


Topic: Gene Cafe First Roasts (5 msgs / 171 lines)
1) From: Jeff Guarino
Well I just tried my first roast using my new Gene Cafe that Santa brought. I used the profile that Eddie had posted and my roast at FC came out at 20min. Looking at Eddie's and MiKe's times it seems that it was long. I'm using an extension cord in my garage and haven't tested the voltage. Can that make a big difference?
Thanks!
Jeff

2) From: Larry English
Voltage could make a difference, but what is the ambient temperature when
you roast?  I'm roasting in an unheated garage, temps around 50-55F and
roasts take around 17 minutes to reach City+ level, maybe 18 for Full City,
with the usual variation for bean density.  I'm not exactly like Eddie's
profile, though.  I preheat the roaster empty at 300F for 2 min, then cool
to 140F; add beans and go 4 minutes at 300F, then 456F until C+ is reached.
I cool to 212F in the roaster, then finish cooling in a mesh strainer over a
downdraft fan.  For darker roasts I usually use 465F rather than 456F.
Times are shorter on warmer days (over 60F), by a minute or so.  So far it
hasn't been colder than 50F here.
Larry
On 12/26/06, Jeff Guarino  wrote:
<Snip>
-- 
"You can't know the unknowable, but you can do the doable." - Jon Carroll

3) From: Eddie Dove
Jeff,
A long / light duty extension cord could make a difference; not sure what it
would do to the heating element, but the fan may run slower / not as
forceful.  The electronics experts on the list can probably help here; I am
not one of them.
Ambient temperature could also make a difference and for the sake of
consistency from batch to batch, which is why I preheat the roaster.  The
lowest ambient temperature in which I have roasted (this past weekend) is 62
F (WINTER!) and the roaster did just fine.  Still, this was only about 10 F
lower in ambient temperature than when I normally roast.  This was in an
unheated garage, but plugged directly into the wall, which is about 40-50
linear feet from the transformer (following the lines) and about 15-20
linear feet (following the lines) from the where the service enters the
house; I've got good voltage there and when I checked it some time ago I
think it was about 121-122V.
The profile I posted is a baseline and one should tweak from there.  I did
34 roasts this past weekend in the Gene Cafe and varied the profile from
bean to bean with very good results ... time will tell this week, but the
Guatemala "Blue Quetzal" Bourbon, Mexico Organic Nayarit Terruno and the
Timor FTO Maubesse turned out great even on only 24 hours rest.  The results
of the Mexico Organic Nayarit Terruno (this is a real gem!) changed my mind
about Mexican coffee; I had tried them before and really did not like them,
but now I am sure it was a result (in some part) of my roasting and not
necessarily the coffee.  The Columbia Excelso 13556 and Guatemala Fraijanes
that I roasted for gifts and sales also turned out excellent.
The biggest factor that will cause inconsistent results with the Gene Cafe,
and perhaps many / all roasters, is batch size; SIZE MATTERS!!!  That
profile that I published for the Gene Cafe is based on 226-230 grams; it did
not perform the same on 300g batches.  When batch size is increased, the
bean mass is going to react more slowly.  The batches that I roasted this
past Sunday were all 250g batches and I tweaked the profile a bit
accordingly.
I plan on posting my roasting and brewing results sheets on my blog sometime
this week; I still need to get better at recording my notes in them like
Kevin.  He does an excellent job.
Hope this helps ...
Respectfully,
Eddie
-- 
My Home Coffee Roasting Blog and Profiles for the Gene Cafehttp://southcoastcoffeeroaster.blogspot.com/On 12/26/06, Jeff Guarino  wrote:
<Snip>

4) From: miKe mcKoffee
This is a multi-part message in MIME format.
If you "need" to use an extension cord and don't "want" voltage drop get a
heavy duty 12g construction extension cord.
 
Both ambient temperature AND line voltage can AND do greatly affect roast
with electric roasting appliances. Think about it with the Gene Cafe. For
ambient air temp X with Y voltage supplied to heater it's designed to work a
certain way. Lower X with constant Y and resulting actual heat to beans will
be lower because Y to heater must heat X more to achieve target temp. Now
lower Y and not as much heat to begin with. Combine lower X & Y and expect
long roasts indeed and sometimes not even possible to get hot enough.
 
If measuring voltage through extension cord (or outlet for that matter) only
measure under load or results will be near meaningless.
Kona Konnaisseur miKe mcKoffee 
URL to Rosto mods, FrankenFormer, some recipes etc: http://mdmint.home.comcast.net/coffee/Rosto_mod.htm
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.  
From: homeroast-admin
[mailto:homeroast-admin] On Behalf Of Larry English
Sent: Wednesday, December 27, 2006 1:21 AM
Voltage could make a difference, but what is the ambient temperature when
you roast?  I'm roasting in an unheated garage, temps around 50-55F and
roasts take around 17 minutes to reach City+ level, maybe 18 for Full City,
with the usual variation for bean density.  I'm not exactly like Eddie's
profile, though.  I preheat the roaster empty at 300F for 2 min, then cool
to 140F; add beans and go 4 minutes at 300F, then 456F until C+ is reached.
I cool to 212F in the roaster, then finish cooling in a mesh strainer over a
downdraft fan.  For darker roasts I usually use 465F rather than 456F.
Times are shorter on warmer days (over 60F), by a minute or so.  So far it
hasn't been colder than 50F here.  
Larry
On 12/26/06, Jeff Guarino  wrote: 
Well I just tried my first roast using my new Gene Cafe that Santa brought.
I used the profile that Eddie had posted and my roast at FC came out at
20min. Looking at Eddie's and MiKe's times it seems that it was long. I'm
using an extension cord in my garage and haven't tested the voltage. Can
that make a big difference? 
Thanks!
Jeff-- 
"You can't know the unknowable, but you can do the doable." - Jon Carroll 

5) From: David B. Westebbe
This is a multi-part message in MIME format.


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