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Discussions > Coffee > Home Roast > Time between FC...  
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boss99er
Junior Member


Joined: 25 Jan 2014
Posts: 50
Location: Omaha
Expertise: I love coffee

Posted Tue Feb 18, 2014, 7:59pm
Subject: Re: Time between FC and SC?
 

Well....my roast tonight was interesting. Instead of cranking the TC up to 480 and letting her go, I did the following:

400 degrees until 5:00 then turned up to 420 through remainder of roast.

Somehow I hit FC much earlier at about 8:15!!! Why would I have hit FC around 9:30 my first two roasts, but at a lower temp I hit it at 8:15. Ambient temp was around 50 degrees.

SC hit at around 11:30 which made me happy....I wanted to extend my time between FC and SC and seem to have done it.

Dumped into cooling rig right at the beginning of SC.

We'll see how it tastes after a couple days!
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CoffeeRon
Senior Member
CoffeeRon
Joined: 26 Apr 2009
Posts: 660
Location: Tacoma Wa.
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: K-30 Vario,Pharos, Vario-W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Wed Feb 19, 2014, 2:29am
Subject: Re: Time between FC and SC?
 

I'm thinking this likely is to do with the dead band on the TO. By turning it up at 5 min. it was likely heating for most of the time till it hit 1C.

You didn't mention what beans you're roasting (or I missed it). Some are much more forgiving than others. I've found a few now that I do quite well with, the list slowly grows as I try new ones here and there. I've also got a few that I've given up on for the time being.

Don't be scared to try a drip brew a few hours after roasting (espresso not so much). Some coffees are pretty good right away, and you'll get to know some of the flavors that will change/go away with more rest as you go. It's interesting to taste the flavors develop and change as the days go on.
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boss99er
Junior Member


Joined: 25 Jan 2014
Posts: 50
Location: Omaha
Expertise: I love coffee

Posted Wed Feb 19, 2014, 7:24am
Subject: Re: Time between FC and SC?
 

That was my guess as well. I think I'll try another roast tonight but start with a much lower "drying out" heat. Any idea what a good setting would be to basically dry the beans before I crank it up to roasting temp? This is the exact reason I'll likely end up PIDing the TC.

I'm roasting Columbian beans right now. Boring, but pretty forgiving for my first roasts. I have a pound of Ethiopian Harrar that I'm saving for after I figure out how to extend the time before FC and also the time until SC......which I'm told I do NOT want to hit with the Harrar beans.
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OregonCityMan
Senior Member
OregonCityMan
Joined: 30 Oct 2013
Posts: 32
Location: Portland, Oregon
Expertise: I love coffee

Espresso: Salvatore SES Semi
Grinder: Ascaso I-2 mini
Roaster: Torrefattore 1KG, DIY 1/2lb
Posted Wed Feb 19, 2014, 10:17am
Subject: Re: Time between FC and SC?
 

The short answer is you should have a pause between FC and SC. I have been using a DIY coffee roaster I designed a year ago. My heat source is a propane camp stove that produces up 10,000 BTU's. The propane stove is a Coleman and offers six distinct heat settings. I use to start the stove on high, then turn it down to medium, and finally to low. This produced  a roast that was completed in 11 to 12 minutes, and had no pause between cracks. The roast was a bit uneven.

I now use the lowest possible setting on the camp stove for the first four minutes, then turn the stove to the second lowest setting for four minutes, then to medium setting until the FC starts. I then drop the stove down to low for the remainder of the roast. This produces a 15 to 16 minute roast of 1/2 pound of greens. I get a nice pause between cracks and an even roast.

I don't use a thermocouple, as the roaster is a stainless steel cylinder that you spin over the flame. It would not be possible to install one anyway. This is an entry level coffee roaster, but you can produce excellent coffee. I know, as I own a small commercial drum roaster that just sits in my garage now as it is much more of a production to use it due to heat up times. I don't roast commercially anymore.
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boss99er
Junior Member


Joined: 25 Jan 2014
Posts: 50
Location: Omaha
Expertise: I love coffee

Posted Wed Feb 19, 2014, 12:26pm
Subject: Re: Time between FC and SC?
 

Sounds like I have some experimenting to do!
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CoffeeRon
Senior Member
CoffeeRon
Joined: 26 Apr 2009
Posts: 660
Location: Tacoma Wa.
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: K-30 Vario,Pharos, Vario-W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Wed Feb 19, 2014, 2:08pm
Subject: Re: Time between FC and SC?
 

boss99er Said:

That was my guess as well. I think I'll try another roast tonight but start with a much lower "drying out" heat. Any idea what a good setting would be to basically dry the beans before I crank it up to roasting temp? This is the exact reason I'll likely end up PIDing the TC.

Posted February 19, 2014 link

These are the kind of questions I'm also trying to get answers to right now. My roasts however usually go to 12 min. or so to 1C. Not sure why yours are going quicker. Did you disconnect the heating element to your sc? That is common practice as the TO puts out plenty of  heat for the roasts. Almico over on HB is getting really long roast times on the other hand and seems to need the extra heat, not sure what's going on there, it seems way out of the norm compared to mine and what I saw on the old threads about SC/TOs when I built mine. Also I don't preheat my setup.

A couple of my favorite beans right now are Mexican Chiapas- really good slightly nutty flavor, and Brazil Conquista- nice smooth chocolaty flavors, both pretty easy to get a good roast from.

Good luck with tonights roast!
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boss99er
Junior Member


Joined: 25 Jan 2014
Posts: 50
Location: Omaha
Expertise: I love coffee

Posted Wed Feb 19, 2014, 2:27pm
Subject: Re: Time between FC and SC?
 

Man....there must be quite a variation in the turbo ovens. I disconnected the heat element in my SC, so that's not contributing. While I was building mine I read that the TO puts out plenty as you mentioned, so disconnected that right away. I also do not preheat mine. Last night I threw the beans in set it to 400 degrees and let it run for 5 min. At that point I kicked it up to 420 and it hit FC faster than if I just set the TO to 480 and let her rip. Ha ha, no idea.....

I do like a nutty coffee....so maybe after my harrar I'll try the Chiapas!
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boss99er
Junior Member


Joined: 25 Jan 2014
Posts: 50
Location: Omaha
Expertise: I love coffee

Posted Wed Feb 19, 2014, 8:44pm
Subject: Re: Time between FC and SC?
 

Ok.......I have no idea. Tonight I set the TO on 300 for the first 6:30. At 6:30 I turned it up to 350. Again I was into FC by 9:15!!! I left it at 350 and hit the first crackles of SC at 11:30....at which time I immediately dumped. My goal is to extend the time before and after FC to get more of a complex flavor.

I wonder, am I doing too small of batches? I've been doing 6oz batches. Maybe if I kick it up to a half pound (8oz) it might help me extend my time getting into FC. I really want to figure this out before I try it on my Ethiopian Harrar.

Whatcha think fellas?
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Frost
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Frost
Joined: 26 Jul 2007
Posts: 2,053
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Wed Feb 19, 2014, 9:44pm
Subject: Re: Time between FC and SC?
 

A couple things:
Setting the TO thermostat to a temperature will have the heater full on until that temperature (or there-about) is reached, at which time the heater will turn off for a period of time. Is there an indicator light that tells you if the heater element is on or off? and does the heater cycle during the roast? If so, when?

How are these batches tasting that you have done already?
When you get a temp probe in there, it will be somewhat easier to tell what is going on when.
I don't see any problem with reaching first crack at 9:15 into the roast as long as the beans are not scorched or tipped. (burnt spots on the beans)

Once you get good control of the heater and ET, all roasters benefit from a thorough preheat.
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CoffeeRon
Senior Member
CoffeeRon
Joined: 26 Apr 2009
Posts: 660
Location: Tacoma Wa.
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: K-30 Vario,Pharos, Vario-W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Thu Feb 20, 2014, 2:04am
Subject: Re: Time between FC and SC?
 

You're probably on to something with the batch size. I usually do 12 oz. roasts and don't think I ever did less than 8 on the scto. I wonder about your thermostat though. I put an oven thermometer in mine early on when I got it and found the temps to be surprisingly right on. Maybe yours is faulty though?

 As you go along, if you like all this, you'll more than likely start buying more beans at a time and a half pound of this or a half pound of that won't be such a big deal. I'm way beyond the starting out stage- I bought a pound of roast coffee from a roaster in Salem Or. when I went down for Thanksgiving last fall. I usually treat myself to a pound for my birthday- IIRC I bought some Intelligentsia last year. Other than that it's all home roast, for better or worse. I buy from 10 to 30 lbs. at a time of the ones I know I like. 5 lbs. just to try one. I usually buy from green coffee buying club or green coffee coop.

 Just giving you an idea of where this can lead.... but buying a pound of this and a pound of that thinking you're going to get the first or second 1/2 lb roast just right can become a frustrating experience (maybe not so much when you really get things down but that doesn't happen overnight). So this is also I guess food for thought.

 Be prepared as well- you'll find even your mediocre roasts will be raved over by friends who drop by and you'll likely tend to go thru more coffee than you're used to.

 Guess I've rambled enough for tonight, busy day at work and I'm tired. Still debating whether to have the espresso machine come on so it's warm when I get home at night, a capp would be good right now.
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