[Homeroast] Homeroast Digest, Vol 25, Issue 23

miKe mcKoffee mcKona at comcast.net
Tue Feb 23 17:53:57 CST 2010

I'll respectfully agree to disagree. Many have used bean mass temperature
monitoring quite successfully (i.e. repeatable) for many years on small home
roasting appliances combined with methods of controlling the roaster making
extremely controllable and repeatable and variable profile roasting
possible. Jim Schulman took his Fresh Roast so far as to PID control it via
thermocouple in bean mass. Mike (just plain) did likewise with P1. Actually
Jim went even further and monitored both bean mass and environment temps
feeding the info to the PID in his FR. I stuck with bimetal thermometer bean
mass monitoring with Caffe' Rosto roasting and manual dual variable voltage
control for heat and air flow. Know of some who've added bean mass and real
environment monitoring to their HotTops including going PID roast control
route. My Computer Controlled Hottop (now pretty much used only for sample
roasting and some profile development) has both bean mass and environment TC

Accurately monitoring temperatures does not replace smell, sound and sight
of roast (in that order) but does greatly enhance consistency and
repeatability and predictability.

Now we can add pigs and snakes to augment civets and jacu birds:-)

Slave to the Bean Kona Konnaisseur miKe mcKoffee

URL to Rosto mods, FrankenFormer, some recipes etc:
Ultimately the quest for Koffee Nirvana is a solitary path. To know I must
first not know. And in knowing know I know not. Each Personal enlightenment
found exploring the many divergent foot steps of Those who have gone before.

Sweet Maria's List - Searchable Archives

> -----Original Message-----
> From: homeroast-bounces at lists.sweetmariascoffee.com 
> [mailto:homeroast-bounces at lists.sweetmariascoffee.com] On 
> Behalf Of Mike Davis
> Sent: Tuesday, February 23, 2010 2:40 PM
> To: homeroast at lists.sweetmariascoffee.com
> Subject: Re: [Homeroast] Homeroast Digest, Vol 25, Issue 23
> It would appear that each roaster and each bean should be evaluated 
> individually.  Obviously some beans just don't look the same at 
> allegedly the same roast level.  Many beans can appear to be at 
> different roast levels in the same batch.  Immature beans come out 
> lighter than mature beans, for example, and dry processed 
> beans are also 
> subject to variations in appearance.
> I'm not completely sold on using temperature because there can be too 
> many variables with that as well.  Commercial roasters are 
> more suitable 
> for temperature measurement because of larger batches and longer 
> roasting times combined with more uniform placement of temperature 
> probes.  Home roasters have accuracy issues with probe 
> placement since 
> temperature probes are not often included within the roasting 
> container 
> itself due to the methods of agitation required (i.e. turning 
> drums, air 
> flow blowers, etc.)  In addition, anyone who cooks knows that you can 
> achieve a thoroughly cooked item with either a long, slow low heat 
> method (crock pot, simmering) or higher heat (broiling, searing).
> So a final roast temperature of, say 450F, might result in the same 
> level on a commercial gas-fired roaster day in and day out, but it 
> probably has no direct correlation to a FreshRoast, iRoast2, Behmor, 
> Gene, Hottop or your backyard grille.
> In my limited experience, I rely on a combination of sound, time, 
> appearance and relative temperature readings from a fixed 
> probe.  Tom's 
> bean chart is my best baseline for comparison until I can 
> find someone 
> to really teach me how to do it 'by the numbers.'  In the 
> meantime, I'm 
> creating my own pig-trail down the jungle path to coffee nirvana with 
> occasional sideways glances in the bushes for snakes.

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