[Homeroast] Ruminations on the QM3 and testing results

Robert Yoder robotyonder at hotmail.com
Sat Mar 12 15:47:53 CST 2011

Thanks, Frank, for your post!
I am very interested to have your take on the differences in the cup between the shorter and longer roast.
Happy Roasting,
robert yoder
> Date: Sat, 12 Mar 2011 08:37:54 -0800
> To: homeroast at lists.sweetmariascoffee.com
> From: fparth at mac.com
> Subject: [Homeroast] Ruminations on the QM3 and testing results
> After having the Quest M3 now for several weeks I have to admit this is the most fun I've ever had
> roasting. I find myself wanting to drink more coffee just so that I can roast more. The amount of
> control and consistency it offers is a blast and satisfies that anal-retentive part of me.
> One of the first things I noticed was that at 8.5 A everything happens a lot faster, a LOT faster,
> than at 7.5 A (duh!). For 150 grams of beans I can get a 11-13 minute roast at 7.5 A while an 8.5
> amp setting is into second crack at 8-9 minutes.
> I got to wondering if the large difference in roasting time would have a noticeable effect in the
> taste. Is the 8.5 A roast too fast? So I roasted two runs of Carlos Imbachi at 7.5 A and two at
> 8.5 A. The only control over the roast was by changing the fan speed. I'm letting them rest for
> three days then I'll carefully brew one cup of each the same way and see if I like one better than
> the other.
> Since I just got everything needed to monitor the temperature using a thermocouple tied to a
> digital monitor, I decided to see if there was a difference between the digital readout and the
> analog dial thermometer that came with the machine. Not only was there a difference, at the 1-2
> minute mark the difference in temperature readouts between the two was huge, as much as 60 degrees
> C. The difference decreased as time went on and the dial thermometer had time to react to temp
> changes. My earlier notes listing time and temperature I realize are now way off in temperature
> readings.
> I took a lot of notes and wrote up a pdf document with pictures, graphs, comments, and questions
> and posted it to my personal web site here: http://fparth.com/misc/Roasting_notes.pdf
> If anyone can help me understand the differences I'm seeing I'd really appreciate the insights.
> Frank
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