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1st crack - 2nd crack
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brockton
Senior Member


Joined: 18 Nov 2012
Posts: 1
Location: montana
Expertise: Just starting

Posted Tue Nov 20, 2012, 2:56pm
Subject: 1st crack - 2nd crack
 

12 oz in a SC/TO hits 1st crack in 9 minutes from a cold start with 475 degrees above the beans and then rolls right into 2nd crack without taking a break. i hear FC sounds along with SC sounds at the same time. the beans burn with no more sounds if i keep going. what am i doing wrong?
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Prof
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Prof
Joined: 10 Sep 2004
Posts: 715
Location: Seattle
Expertise: Pro Roaster

Espresso: PV Lusso
Grinder: Pharos 696
Drip: Aeropress
Roaster: Behmor 1600+
Posted Tue Nov 20, 2012, 3:28pm
Subject: Re: 1st crack - 2nd crack
 

brockton Said:

12 oz in a SC/TO hits 1st crack in 9 minutes from a cold start with 475 degrees above the beans and then rolls right into 2nd crack without taking a break. i hear FC sounds along with SC sounds at the same time. the beans burn with no more sounds if i keep going. what am i doing wrong?

Posted November 20, 2012 link

Turn down the heat when 1C gets rolling and let 1C stretch out.  What the actual bean temperature is, you can only guess, obviously somewhat less.

You'll have to do some roasting trials to get more familiar how to "surf" the temperatures because most TO's have a large gap between heat on and heat off.

OH, also check your bean load.  If you are using 1/2#, the temp adjust will be different than with 1#.

 
LMWDP # 010
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Frost
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Frost
Joined: 26 Jul 2007
Posts: 2,105
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Tue Nov 20, 2012, 4:06pm
Subject: Re: 1st crack - 2nd crack
 

Yeah,475F 'above the beans' is too hot. Try a pre-heat the keep time to first crack at 9 minutes or less, and lower the finish ET from 475F to 450-460F. You should be able to run the start of first crack until finish at 3-4 minutes without ever entering second crack.
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