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Topic: measuring time between cracks? (was moding a Behmor) (3 msgs / 52 lines)
1) From: Dave Ehrenkranz
Now I have a Behmor and can actually hear the cracks. But  
establishing when cracks actually start and end is problematic for  
me. Often after I think record first crack has ended and have  
recorded such I will then hear additional cracks. I realize there are  
always outliers but defining when cracks start and end seems very  
subjective (at least for me). I am curious how others define the  
start/end of various stages. Do you have a minimum number of cracks  
per sec or ....
dave
On Jan 26, 2008, at 9:34 AM, Alchemist John wrote:
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2) From: kevin creason
I'm not an expert on roasting, even in my own mind, but I'll still answer.
I write them down because it might be important to know later-- but I write
them down as "lonely" cracks.
On Jan 26, 2008 1:20 PM, Dave Ehrenkranz  wrote:
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-- 
-Kevin
Admit your errors before someone else exaggerates them. - Andrew V. Mason

3) From: Ken Mary
Outliers are usually due to stuck beans. The first pop of either crack 
occurs at a predictable BEAN temperature assuming normal ramps of 10 to 20F
per minute. Normal first crack pops end within 1 to 1.5 minutes and cover
the range of 398F to 425F. Any noise above 425F and below 439F is likely an
early snap of second due to stuck or broken beans. Here is where a
temperature readout is valuable, telling how close you are to second, and
being able to distinguish these early snaps.
Faster ramps over 20F per minute may delay both the start and end of first,
and the range may often overlap the start of second crack. The first snap of
second normally occurs at the same temperature (about 439F) almost
independent of ramp speed.
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