HomeRoast Digest


Topic: Turbo roasting update (13 msgs / 375 lines)
1) From: EuropaChris
Just a quick update/comments on my Turbo roasting adventures.
Been drinking some Columbian (don't remember the origin) the last two days in the Bunn at work that I test roasted.  It's a very nice cup.  Muted acidity, good body.  However, I notice there's not a lot of aroma to the roasted beans in the ziplock back.
Roasted a cup of Monkey Blend last night.  Roast came out fairly even, but not as even as an air roast.  Probably should have cut back on the amount a bit.  Again, I noticed less aroma in the mason jar this morning compared to an air roast.  The espresso was good, but a bit under-roasted and lacking in complexity.  I should have let it go another 30 seconds into 2nd crack.
Total roast times are in the 11 to 12 minute range, so I'm not over-extending the roast.  However, the Turbo oven roast seems to be limited by the temperature rise of the oven itself.  That is, I preheat to 350F.  Pour beans in and crank the temp to full blast.  It seems the roast progresses only as the temp rises in the oven.  It's getting up to max (475F) at about the end of the roast.  I don't have a thermometer in the oven, so I'm only going by what the thermostat is telling me.
Now, I've only run 3 roasts, so I'm hardly familiar with it yet.  But, with all the talk lately about profiles, I'm wondering what the opinions are....
Again, for reference, here's my procedure:
1) Put low rack and perforated metal 'diffuser' pan into oven.
2) Turn on to 350F and let warm up.
3) When it hits 350F, dump about 1 cup of beans into the pan, evenly 
spread out.
4) Replace lid and start timer
5) At about 3 minutes, remove lid and stir beans lightly to ensure even 
roasting.
6) When the oven reaches 350F again, crank thermostat up to 450F/max.
7) At about 7 minutes, first crack starts, and is drawn out over a 
minute or two.
8) At about 10 minutes, second crack starts, again, not a real 
'agressive' second crack.
9) When I decide it's 'done', I remove the top, grab the inner pan with 
my channel locks and carry it to where I can dump the beans into a big 
pan for cooling and chaff removal.
Chris
The NEW Netscape 7.0 browser is now available. Upgrade now!http://channels.netscape.com/ns/browsers/download.jsp
Get your own FREE, personal Netscape Mail account today athttp://lists.sweetmarias.com/mailman/listinfo/homeroast">http://webmail.netscape.com/homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

2) From: Steven Van Dyke
Chris,
I *tried* a pure air-oven roast and was not at all happy with it - could
*not* get good agitation and couldn't get an even roast without it.
Spotted a StirCrazy popcorn popper (the big 8-quart model) for only $40 at
the local Dillards and mentioned to my ever-indulgent wife that it could be
used as part of a roaster.  She was willing to buy it on the spot but I
deferred an hour or so while I came home and checked my list archives to see
if I had to modify it in any way (no).  Having it stirring the roast makes a
*tremendous* difference.  I just set my air oven for full power, dump 1 cup
of beans on the popper base (could probably do 2 cups if I wanted to), set
the oven top over the popper and let 'er rip!  Takes about 7 minutes to get
to around Full City - some coffees I stop just as the first couple of beans
hit second crack, some I take to a 'rolling' second crack.
You *will* need some oven mitts at this point - the handles of the popper
are almost as hot as the coffee.  I pour it into a large steel strainer I
bought at the oriental market for a few bucks and hold that over a small
fan.  I use a large spoon to stir the mass and periodically pour it back and
forth between the strainer and a thin steel colander I also bought at the
oriental grocery.  The pouring is to get the chaff out - make sure you point
the fan slightly out rather than straight up or you'll get a face full, he
said in an experience voice.  After a couple of minutes the beans are cool
enough to work with my hand (I get a better mixing action this way). Within
the desired 4 minute window they're at room temperature or slightly below.
Sure, it's a bit of a Frankensteinian assemblage, but it works really well -
10 minutes to go from a cup of greens to a pint of fresh roast.
Enjoy!
Steve :->
http://www.svandyke.com<- my simple home page
http://www.cafeshops.com/stevespics<- my little store of Impressionist &
Special Events Photography stuff)

3) From: EuropaChris
I've got a few more roasts to try with the 'naked' Turbo, then I may try the Crazy iteration.  I already have a Crazy, but if I wreck it, I'm dead.  My wife loves a good batch of Stir Crazy popcorn.  
My goal is to mod the oven to add in some sort of agitation.  Not sure how to do it yet.  My roasts aren't too uneven, but 3/4 to 1 cup is the max, and I stir the beans about 3 minutes into the roast to help even them up.  I also shake the oven gently every few minutes to move the beans around.  Not perfect, but it helps.
"Steven Van Dyke"  wrote:
<Snip>
The NEW Netscape 7.0 browser is now available. Upgrade now!http://channels.netscape.com/ns/browsers/download.jsp
Get your own FREE, personal Netscape Mail account today athttp://lists.sweetmarias.com/mailman/listinfo/homeroast">http://webmail.netscape.com/homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

4) From: Steven Van Dyke
Chris,
You don't have to make any modifications to the Stir Crazy Popper (well, you
*might* have to bend the ends of the stirring arm up a touch if they're
dragging but you need to do that anyway for making popcorn).  Just set the
Turbo air oven top neatly centered over the Stir Crazy base and you'll see
that it fits with about 1/4" gap all the way around (at least with my set of
things it does).
Get a shallow box you can set everything in to catch the chaff, or do the
roast *outside* - trust me on this one. 
Honeywell makes and Wal-Mart sells a nice little box fan (about $10) that
can be wall mounted so it rotates to vertical or the better near-vertical
position.  Use that and a strainer / colander for your cooling.
Enjoy!
Steve :->
http://www.svandyke.com<- my simple home page
http://www.cafeshops.com/stevespics<- my little store of Impressionist &
Special Events Photography stuff)

5) From: Ryuji Suzuki -- JF7WEX
From: EuropaChris (Chris Beck)
Subject: Re: +Turbo roasting update
Date: Wed, 02 Oct 2002 08:55:40 -0400
<Snip>
  try the Crazy iteration.  I already have a Crazy, but if I wreck it,
  I'm dead.  My wife loves a good batch of Stir Crazy popcorn.
Turbo Oven itself makes very interesting roasts (spares more spiciness
than Turbo Crazy) but it's not as reproducible.
If you use Stir Crazy and try variety of roast range with many
profiles, you'll find what breaks Stir Crazy's phenol-formaldehyde
plastic (bakelite) center screw holding the agitator. If you can't
afford to break one, it's not a good platform.
I found 11" spring cake ring very effective to fit between Stir Crazy
and Turbo Oven. I don't have chaff burning problem as previously
reported here by someone. With my improved agitator, 1.0+ lb
post-roast weight very possible, with slightly more apparent
unevenness.
I'm thinking about making a brass or ceramic replacement for the
center shaft and agitator holding mechanism. It's a very simple
structure, and a couple of hours in a machine shop would do.
--
Ryuji Suzuki
"I can't believe I'm here.
People always say that I'm a long way from normal."
(Bob Dylan, Normal, Illinois, 13 February 1999)
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

6) From: EuropaChris
Thanks for the added info.
I did find last night that the thermostat on the oven was off by 100F!!  I'd set it for 350F and I got 450F!  Hmmm.  There was no way I could see to actually calibrate it, aside from taking off the temp. knob and moving it to the proper setting.  Works, but it's kind of Rube Goldberg.
I also found the air temp in the oven varies by at least 75F between the center of the oven and the outside edge (radially).  This is why the beans in the center of the pan were roasting lighter than the outside beans.  It must be due to the heat and circular airflow.
Now that I have the temperature in line, I can do some more experimentation.  Overall, it's a nice toy, but I still think I'll get an Alp for my espresso roasting and roast chicken in the oven.
Chris
Ryuji Suzuki -- JF7WEX  wrote:
<Snip>
The NEW Netscape 7.0 browser is now available. Upgrade now!http://channels.netscape.com/ns/browsers/download.jsp
Get your own FREE, personal Netscape Mail account today athttp://lists.sweetmarias.com/mailman/listinfo/homeroast">http://webmail.netscape.com/homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

7) From: Ryuji Suzuki -- JF7WEX
If you are using Turbo Oven without Stir Crazy, preheat is almost a
must, especially if you operate by the thermostat. You know the
thermostat is situated on the heater assembly, and you are measuring
the air temperature, from which the glass bowl sucks heat out. It is
not fair to criticize its inaccuracy without considering the heat sink
effect of the glassware.
My thermostat is reasonably accurate but turns off at a bit higher
temp and off at lower temp, with some window. I've manually controlled
the on-off cycles by moving between min and max positions, but the end
result did not make meaningful difference to make a big deal out of
it. For my daily coffee roasting, I just go by the thermostat and the
result is just as good as any other method I tried. Of course, I
preheat to about 140C to minimize the effect of heat capacity of the
apparatus, although I use Turbo Crazy setup almost exclusively these
days. This is partly because my glass bowl part is not perfectly free
of chicken and salmon flavor (and something else).
I suggest to get a 6qt Stir Crazy and 11" spring cake ring. The Stir
Crazy's diameter is about 11-1/2" but when the spring is unfastened
the diameter increases by this much. I saved the paper with catalog
number if anyone is interested, but it shouldn't be too hard to find
one that best fits SC among 11" rings (just measure the
diameter). It's harder to find a store that carries anything bigger
than 9" or 10".
If you get a SC only for roasting, I suggest to cut the heater wiring,
or at least put a dimmer on that branch only. Don't put a dimmer or
transformer on the motor branch.
If someone comes up with a way to agitate beans in the glass bowl
(without SC) it would be great, but I haven't found anything that I
could use without drilling the bowl. Clockwork motor with sufficient
torque that keeps running for 10 minutes would be ideal...
--
Ryuji Suzuki
"I can't believe I'm here.
People always say that I'm a long way from normal."
(Bob Dylan, Normal, Illinois, 13 February 1999)
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

8) From: Ryuji Suzuki -- JF7WEX
I said:
<Snip>
I said above (as well as other parts) as a general comments, and I
didn't ignore that you got higher temp than you set. That may be
because of thermostat inaccuracy... If you don't like pasting paper
for calibrated scale, what about plastic film stickers??
--
Ryuji Suzuki
"I can't believe I'm here.
People always say that I'm a long way from normal."
(Bob Dylan, Normal, Illinois, 13 February 1999)
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

9) From: EuropaChris
Yup, I followed your original comments on Turbo roasting.  I preheated to 350F, poured beans in, waited for 350F again, and then cranked it up to 500F.  But, as I was trying to get some temperature profiles measured last night, I discovered that 350F on the thermostat was closer to 450F in actual temperature!!!  Now I have it where it goes between 325F and 375F for a setting of 350F.  Pretty good.
Now, I can try some temp profiling and get meaningful data.  I also may drill the bowl and make an agitation setup.  I don't need it as an oven, so a dedicated roaster is fine with me.
Chris
Ryuji Suzuki -- JF7WEX  wrote:
<Snip>
The NEW Netscape 7.0 browser is now available. Upgrade now!http://channels.netscape.com/ns/browsers/download.jsp
Get your own FREE, personal Netscape Mail account today athttp://lists.sweetmarias.com/mailman/listinfo/homeroast">http://webmail.netscape.com/homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

10) From: EuropaChris
My fix, which is only after I took apart the entire oven, was to simply re-position the knob on the thermostat shaft so it reads close to actual.  These types of appliance thermostats are notoriously inaccurate.  However, the Turbo Oven is a slick little oven.  I've never actually cooked with one, so I'm going to whip up something this weekend to try it out.  
Also, I thing for coffee roasting, the accuracy isn't too important.  The trick is to get the bowl hot (as you said, it's a big heatsink), and then to let temp rise of the oven set to 500F do the roasting.  It certainly works!
Chris
Chris
Ryuji Suzuki -- JF7WEX  wrote:
<Snip>
The NEW Netscape 7.0 browser is now available. Upgrade now!http://channels.netscape.com/ns/browsers/download.jsp
Get your own FREE, personal Netscape Mail account today athttp://lists.sweetmarias.com/mailman/listinfo/homeroast">http://webmail.netscape.com/homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

11) From: Angelo
Ryuji,
Could you please elaborate on that last sentence? I seemed to have missed 
something....:-)
Angelo
<Snip>
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

12) From: Ryuji Suzuki -- JF7WEX
From: Ryuji Suzuki -- JF7WEX 
Subject: Re: +Turbo roasting update
Date: Fri, 04 Oct 2002 13:02:06 -0400 (EDT)
<Snip>
I post this before I forget...
The cake ring that fits the best (among what I searched for) is:
Bakita (Dr. Oetker) Springform cake ring 28cm diameter. Manufacturer
Article No. 02615. About $12 a piece.
The cake ring doesn't have to be the exact same one, but if you can
find this you can cut the effort to figure out what fits the
best. Take the bottom plate out by loosening the spring, and put it on
top of SC, adjust the spring to fit best. Then start roasting
procedure on SC, but the difference is to put the Turbo Oven on top of
the cake ring, not on the SC directly. Increase capacity, but decrease
the air leak, leading to better control when you intend to raise
temperature quickly, especially when there is much beans. There's no
place for silver skin to exit, which may be a drawback if you are
roasting chaffy beans. In my experience so far, because the distance
from bean to the heating element is increased, only a few chaffs got
burnt.
FYI,
--
Ryuji Suzuki
"I can't believe I'm here.
People always say that I'm a long way from normal."
(Bob Dylan, Normal, Illinois, 13 February 1999)
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

13) From: Chris Beck
Thanks for the info!  Maybe I can find a spare Stir Crazy at the local 
thrift stores...
Chris
Ryuji Suzuki -- JF7WEX wrote:
<Snip>
-- 
Your favorite stores, helpful shopping tools and great gift ideas. 
Experience the convenience of buying online with Shop! http://lists.sweetmarias.com/mailman/listinfo/homeroast">http://shopnow.netscape.com/homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast


HomeRoast Digest