[Homeroast] Jimma

Yakster yakster at gmail.com
Thu Oct 14 14:33:57 CDT 2010


picture of the thermocouple here:

http://m661.photobucket.com/albumview/albums/yakster/Thermocouple.jpg.html#mm_collapsed

Pecked out on my mobile phone.

-Chris

Pecked out on my mobile phone.
On Oct 14, 2010 11:57 AM, "Robert Yoder" <robotyonder at hotmail.com> wrote:
>
> Thanks, Chris, for the detailed information! I think this is very useful,
and if you do develop a Bean Mass Temperature-indicator, I'd like to see
those data plotted along with the others. Do you plan to use "FarmRoast's"
method?
>
> I would like to see how you mounted your Enviro Temperature Thermocouple.
Any chance you might have a picture?
>
> Thanks again, and,
>
> Happy Roasting,
>
> robert
>
>> Date: Thu, 14 Oct 2010 10:44:43 -0700
>> From: yakster at gmail.com
>> To: homeroast at lists.sweetmariascoffee.com
>> Subject: Re: [Homeroast] Jimma
>>
>> For understanding the Behmor profiles, nothing beats Ira's BehmorThing
>> program available on www.behmorthing.com. I use it to plan and track my
>> roasts and greens inventory, it's invaluable if you're trying to get a P2
>> temp drop to occur at a given time (though I almost never use a P2
profile
>> anymore myself and now just open the door to cool things down). Also,
never
>> walk away from the Behmor during the roast... it may be tempting because
>> it's pre-programmed, but the results could be disastrous.
>>
>> I'll keep this somewhat on-topic by using my Jimma roast profile as an
>> example in this email.
>>
>> Since the Behmor doesn't have a temperature display, it's hard to talk
about
>> temperatures. It's also going to depend on the voltage available during
the
>> roast which can affect the heat output. It's also going to vary depending
>> on where you measure the temperature in the Behmor because of the air
>> circulation.
>>
>> The following picture is a roast graph of my roast of the Jimma, I
roasted a
>> full pound on a 1# P3 B profile which I ended up extending the time on to
>> reach my desired roast. It took quite a while to take the full pound to
>> first crack, the coffee is tasting very good now but I may roast my next
>> batch with a P1 profile which is full power throughout the roast. I have
a
>> thermocouple taped along the bottom of my roaster that's positioned about
>> one quarter inch below the bottom heating element to give me a good idea
of
>> the heat output of the roaster during the roast. I don't have a Bean
>> Temperature thermocouple installed yet.
>>
>> http://www.twitpic.com/2xkz9g/full
>>
>> You can see that even though the profile (blue line) shows a stepped
roast,
>> the heat ramps up and is not instantaneous. I pre-heated the Behmor and
>> old-style chaff tray for one minute on a P1 profile before putting in the
>> beans and starting the roast, so the drop-in temp is about 200 degrees.
Be
>> careful not to pre-heat too long (more then about 2 minutes) or the
roaster
>> will not restart after stopping it, and wear Ove Gloves or other
protection
>> for your hands.
>>
>> The hump at about 8 minutes in is when the afterburner and fans kick in
for
>> smoke reduction. The green bar at the bottom indicates when I started and
>> stopped controlling the temp by opening and shutting the door. I started
>> early, probably too early, to kill some of the momentum going into first
>> crack. I watch the temperature and listen to the roast while adjusting
the
>> door position to get the temps where I want them. The olive box indicates
>> the start and end of first crack. Finally, the dip at about 25 minutes is
>> when I stopped the roaster and pulled the beans to quickly cool them in
my
>> bean cooler. I let the Behmor take care of the cooling in the beginning
as
>> it's pretty good at getting hte temps down to start with, but when the
temps
>> drop low enough I pull the drum and restart the cool cycle while cooling
the
>> beans myself. Here's a picture of the beans cooling:
>>
>> http://www.twitpic.com/2x6sgj
>>
>> I'm not posting this information to be held up as an ideal roast, it's
not.
>> This is pretty much a generic roast profile for me that I use for a lot
of
>> beans as a starting point that works well for espresso and brewed coffee
>> most of the time. It may be sacrilegious, but I've actually been using
>> profiles that take longer to get to first then the experts recommend on a
>> regular basis and been very happy with the results, especially when I get
a
>> full pound of beans out of the roast in one batch to brew for the week. I
>> look at the Quest roaster and it looks really nice, pretty much the
opposite
>> of the Behmor with full manual control, but I don't know if I'd be happy
>> with 200 gram roasts. I've gotten to like being able to come home and
roast
>> a pound of coffee at night, but I know a more hands-on roaster would help
>> develop my roasting skills. I think next time, as I said, I'll use a P1
>> profile and open the door to control entry into first crack with my next
>> Jimma roast.
>>
>> Also note that this is a roast of a full pound of beans. As such, things
>> ramp slower and the beans gain more momentum. I can open the door during
>> first crack on full pound roasts and see the temperature hold steady with
>> the door fully open. With a smaller batch, you'll get to first much
quicker
>> and the bean mass won't hold the heat so much.
>>
>> Hopefully this information will help others understand how the Behmor
works
>> and how the profiles work, that's the intention anyway.
>>
>> -Chris
>> _______________________________________________
>> Homeroast mailing list
>> Homeroast at host.sweetmariascoffee.com
>>
http://host.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.com
>> Homeroast community pictures -upload yours!) :
http://www.sweetmariascoffee.com/gallery/main.php?g2_itemId=7820
>
> _______________________________________________
> Homeroast mailing list
> Homeroast at host.sweetmariascoffee.com
>
http://host.sweetmariascoffee.com/mailman/listinfo/homeroast_lists.sweetmariascoffee.com
> Homeroast community pictures -upload yours!) :
http://www.sweetmariascoffee.com/gallery/main.php?g2_itemId=7820


More information about the Homeroast mailing list