[Homeroast] Things i learned from Dan at USRC

Joseph Robertson theotherjo at gmail.com
Fri Dec 25 11:10:45 CST 2009


Great advice and a fun read too Ray. I am stopping at keeping the batteries
fresh in mine.
JoeR

On Fri, Dec 25, 2009 at 2:51 AM, <raymanowen at gmail.com> wrote:

> Anybody that tries to "recalibrate" a thermocouple readout  meter will find
> out soon enough that it's not nice to fool with mother nature. Have you
> been
> doing it, and did you cause all this recent vile weather?
>
> If you reset any measuring device, you can reset the Zero and the Full
> scale
> Span. A millivolt potentiometer is a laboratory standard, cumbersome to use
> as a real time readout device. Any screwdriver adjustment you might make
> would just obliterate the calibration, making it totally unreliable.
>
> You are already doing the right thing, by taking the temperatures as
> relative numbers, not absolutes.
>
> If you are satisfied with the results you can achieve right now, you would
> be within your rights to SHOOT any hammer mechanic that arbitrarily
> "tweeks"
> your calibrations just because he can also operate a screwdriver.
>
> If you SNAFU your Edsel speedometer so that it reads 15 mph when you're
> parked, and 50 mph when you're doing 80 mph, explanations to the constable
> won't make much progress.
>
> A properly calibrated thermocouple readout or meter will give the
> temperature of the measuring junction, no matter how it gains or loses
> heat.
>
> You could recalibrate the perceived color of a red traffic signal if you
> approach it at 5,000,000 mph. The Doppler shift would shorten the long Red
> wavelength to a nice Green. (The opposite of the Red Shift)
>
> Cheers, Mabuhay, Iechyd da -RayO, aka Opa!
>
> On Thu, Dec 24, 2009 at 9:38 PM, miKe mcKoffee <mcKona at comcast.net> wrote:
>
> > 1st crack 354f ish? That's 40f low start of "real" 1st crack temps. Now
> my
> > USRC 3k's bean probe offset calibration has been off ~20f since the day I
> > got it 2 years ago, ie 1st cracks start my bean temp reading 375-380f.
> > Haven't bothered to call to find out how to correct the offset. And it's
> > been no biggy since I know it's off and have all my profiles built
> > accordingly. But 354f 1st crack? Not real bean temp, no way. Check Tom's
> > pictorial which includes crack temps. My Caffe' Rosto & CCR HotTop
> roasting
> > temps always agreed with Tom's pictorial examples. So I knew my USRC 3k
> > bean
> > probe was calibrated wrong from the git go. If your 3k is reading 354f
> bean
> > temp 1st crack I'd have them correct the calibration before it ships.
> >
> > Slave to the Bean Kona Konnaisseur miKe mcKoffee
> > http://www.NorwestCoffee.com
> >
> > URL to Rosto mods, FrankenFormer, some recipes etc:
> > http://www.mckoffee.com/
> > 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
> > http://themeyers.org/HomeRoast/
> >
> >
> > > -----Original Message-----
> > > From: homeroast-bounces at lists.sweetmariascoffee.com
> > > [mailto:homeroast-bounces at lists.sweetmariascoffee.com] On
> > > Behalf Of michael brown
> > > Sent: Thursday, December 24, 2009 7:14 PM
> > > To: homeroast at lists.sweetmariascoffee.com
> > > Subject: [Homeroast] Things i learned from Dan at USRC
> > >
> > >
> > > Well add me to the list of USRC roaster owners.  I was in Oklahoma
> > > Tuesday to be trained on my new 3kilo roaster.  She's fire engine red
> > > so i've named her Ginger!  Should be shipped out beginning of
> > > next week.
> > >
> > >
> > >
> > > I was really excited to learn more about temperature, times, heat, etc
> > > since i've been a behmor user for so long and have been limited to
> > > profiles.
> > >
> > >
> > >
> > > Here are some of the highlights from what i've learned, and
> > > would love to hear some input;
> > >
> > >
> > >
> > > These are of course generalizations..
> > >
> > >
> > >
> > > Temperature goals:
> > >
> > > 300F in 6.5-7min
> > >
> > > 365F in 10min
> > >
> > > 400F in 12min, then BACK OFF to lengthen out 1st
> > >
> > >
> > >
> > > First crack goal: 10min
> > >
> > > Average 1st crack temp: 354F ish, some as early as 320F
> > >
> > >
> > >
> > > One of staff said this gem: "The first 12min is science, the
> > > last 3 is art."
> > >
> > >
> > >
> > > Michael B
> > > _________________________________________________________________
> > > Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
> > > http://clk.atdmt.com/GBL/go/171222985/direct/01/
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>
> --
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