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Time between FC and SC?
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Discussions > Coffee > Home Roast > Time between FC...  
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boss99er
Senior Member


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

Posted Mon Feb 17, 2014, 9:22am
Subject: Time between FC and SC?
 

Hey guys, just completed my second roast. Should there be a "quiet time" between FC and SC? Mine seem to carry right into each other with no discernible time between them. My FC (sharp snaps) started at 9:15 and my SC (subtle crackles) are noticed at 11:15.

I'm using a home built Turbo Crazy. For the roast I had it set to 480 the whole time. I think I'm just ramping up heat too fast and flying right through the two cracks. On my next roast, I considered setting to 480 until FC starts, then dropping to 440 for the rest of the roast. Sound like a solid plan?
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CoffeeRon
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CoffeeRon
Joined: 26 Apr 2009
Posts: 749
Location: Tacoma Wa.
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: Macap M7D, Pharos, Vario W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Mon Feb 17, 2014, 11:42am
Subject: Re: Time between FC and SC?
 

From my experience simply turning it down right then probably won't cool it down quick enough to help, especially running at 480. You might try running a bit cooler from the start (try 450 for starters), and shoot for a bit longer till first crack. From there turning it down will be more responsive as it won't be heating as fast. Lifting the TO to cool it down more helps as well. The more you roast the better feel you'll have for what it's doing and what it's going to do. Enjoy!
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boss99er
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Joined: 25 Jan 2014
Posts: 50
Location: Omaha
Expertise: I love coffee

Posted Mon Feb 17, 2014, 12:53pm
Subject: Re: Time between FC and SC?
 

Cool! Thanks for the info! How long should it take to hit first crack? Is 9:15 way too fast? I'll try setting the heat at 450 tonight and try to hit FC a little later and see if there is a space between cracks. I've been keeping very careful notes, so I should be able to note changes.
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CoffeeRon
Senior Member
CoffeeRon
Joined: 26 Apr 2009
Posts: 749
Location: Tacoma Wa.
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: Macap M7D, Pharos, Vario W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Mon Feb 17, 2014, 12:58pm
Subject: Re: Time between FC and SC?
 

I wouldn't say WAY too fast but going even as far as 12 min or more till first crack can make for some good roasts.
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CoffeeRon
Senior Member
CoffeeRon
Joined: 26 Apr 2009
Posts: 749
Location: Tacoma Wa.
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: Macap M7D, Pharos, Vario W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Mon Feb 17, 2014, 1:15pm
Subject: Re: Time between FC and SC?
 

BTW how are you cooling your beans? The time it takes to cool will make a noticeable difference in your end result. I started out just pouring back and forth between colanders in front of a fan. Didn't work very well really.

A very nice bean cooler can be made by picking up a small cheap shop vac and a 5 gal. plastic bucket. Cut a hole in the side of the bucket that the vacuum hose will just push in snug (about mid way up is what I did), cut a hole in the lid that a colander will sit say half way down in.

When your roast has finished dump the beans in the colander and turn on the vac. Stir with a wooden spoon or whatever for a couple min. and you're good. This simple setup works surprisingly well.
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boss99er
Senior Member


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

Posted Mon Feb 17, 2014, 1:46pm
Subject: Re: Time between FC and SC?
 

My cooling rig is EXACTLY as you described. The 5gal bucket, shop vac, etc. I can get my beans down to ambient temp in about 1 minute.

Ha ha......as I was reading your description I started laughing because you were describing mine exactly!
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Frost
Senior Member
Frost
Joined: 26 Jul 2007
Posts: 2,092
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Mon Feb 17, 2014, 1:51pm
Subject: Re: Time between FC and SC?
 

You can back off the heater a bit to slow the finish, but be very very careful here. You don't want to ever 'cool' the beans during the roast, always keep your oven temperature higher than the bean temperature. It helps to have accurate and well placed thermometers in the roaster to measure your bean temperature and oven temperature. (referred to as Environmental Temperature in coffee roasting) Also having good thermostat control of the heater to avoid wide swings in the temperature when it cycles on and off. (Variac, PID or some form of proportional control)
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boss99er
Senior Member


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

Posted Mon Feb 17, 2014, 1:59pm
Subject: Re: Time between FC and SC?
 

Got any recommendations on a good multi-probe thermocouple.....that isn't insanely expensive?
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Frost
Senior Member
Frost
Joined: 26 Jul 2007
Posts: 2,092
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Mon Feb 17, 2014, 2:06pm
Subject: Re: Time between FC and SC?
 

I've been using this one for ET for about 6 years now. It matches a 400F mercury thermometer fairly well:
http://www.web-tronics.com/csi6500.html

(not multi-probe though...)

For a bean probe, I'm just using one of the digital 'oven thermometers' available at kitchen stores. Make sure it can handle 450F+ temperatures.
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boss99er
Senior Member


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

Posted Mon Feb 17, 2014, 2:10pm
Subject: Re: Time between FC and SC?
 

Bean temp might be tricky to measure with my turbo crazy. I'll have to brain storm how to do that....

Frost, what type of roaster do you use?
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