HomeRoast Digest


Topic: Home Built Roaster opinions (20 msgs / 544 lines)
1) From: Lowe, David
Since starting to roast last March or April I have contemplated, from =
time to time, building my own roaster. As a user of a WB II (from a =
thrift store) most of my thoughts have centered around an air roaster. =
Seeing the efforts going on here has encouraged me to move beyond just =
thinking. 
My question is related to drum vs. air roasters: in terms of the result, =
what are the advantages of each? I'm not thinking so much about =
complexity of design, but rather whether one is inherently better than =
the other. If it makes any difference, I want something that can roast =
about 1/2 lb or so. Any thoughts?
Dave Lowe

2) From: floyd burton
Check out Ed Needham's site www.homeroaster.com for some ideas.  SInce there
are gas grills all over the place it maybe easier to build a grill based
drum roaster than a fluid bed or air roaster.  IMHO if u can control the
heat in an air or fluid bed roaster you should be able to get results
similiar to a drum roaster.  Now is a very good time to buy gas grills-big
closeouts all over the place-bought mine a month too early-they just knocked
another $25 off the price.  Wahhhhh
good luck

3) From: AlChemist John
Sometime around 10:51 AM 1/24/2003, Lowe, David typed:
<Snip>
I don't think one is inherently better.  It has to do with fully what you 
like and what you want.  In general, the drum roasted coffee are talked 
about as being deeper and fuller as compared to fluid roaster.  That is the 
direction I lean.  OTOH, the fluid beds are talked about giving a brighter 
and cleaner cup.
What profile do you like in your cup.?  I think that could lean you heavily 
one way or the other.
I am in the middle of chemical analysis 6 coffee samples roasted by 
different methods.  Right now, there do appear to be some subtle 
differences between the different methods, but I won't know more until I 
digest the data.
I know you said you are not thinking much about complexity of design, 
implying a little consideration in that direction.  IMNSHO, fluid air 
roasters are simpler to design and implement than drum roasters (at least 
from scratch).  The heated moving parts in a drum roaster can be tricky.
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

4) From: floyd burton

5) From: Mike McGinness
From: "floyd burton" 
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a
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add
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get
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Ditto suggesting Ed's excellent site. I'm currently in the control the fluid
bed camp using dual variable transformers for heater & fan and love the
ability the control roast length and ramp. However, it would most likely be
simpler and cost less to build a gas grill drum roaster. But not necessarily
cost less, popcorn poppers are cheap, I got a 10A variac on eBay for $35
(heater control), fan control parts new another $15 or so, $10 for Weber BBQ
thermometer 5-1/2" probe. So for about $60 bucks you can have total control
of a home fluid bed roaster. (doesn't include all the *bells & whistles* I'm
including in my new combined controller, digital true rms ac panel meter
cost me $70 - new in box old stock... eBay again - *regular* best price I
could find $180!) But grill/drum you don't have to mess with tricky
electrical circuits nearly as much. On the other hand, I don't believe a
home drum roaster is as versatile in achieving different roast profiles.
Choices choices choices! Almost as *bad* as the array of greens available to
roast!
MM;-) aka Kona Konnaisseur miKe mcKoffee
Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

6) From: Owen Davies
In a slight change of direction for this thread, what about combining hot
air and drum roasting?  I'm thinking about a horizontal drum with stirring
vanes and a hot-air source aimed so that the air circles the drum and exits
the machine by going in one end of the drum and out the other.  Should
combine the benefits of hot-air and drum roasting, kind of like the Rosto is
supposed to, with plenty of opportunities for chaff collection and the
insertion of thermocouples.  It looks to me like cooling would be the only
significant challenge, and even that might be handled.  Any thoughts?
Owen Davies
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

7) From: Ben Treichel
Now we're back to my question of what is drum and what is hot air I 
asked before.
Owen Davies wrote:
<Snip>
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8) From: Mike McGinness
From: "Ben Treichel" 
<Snip>
*Hot air* is what gets typed here a lot, *drum* is the sound of my better
half hitting me up side the head for too much hot air!:)
MM;-) aka Kona Konnaisseur miKe mcKoffee
Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

9) From: Dan Bollinger
Owen, This is what I am building.  I'm using a heat-blower (much quieter
than a heat-gun) to supply the heat into a stationary drum. I'll rotate the
internal dashers to tumble the beans.  Adding a TC is easy when the drum
isn't turning.  With this arrangement, I think it will be possible to
duplicate any profile and mimic hot-air roasters as well as drum roasters.
Dan
<Snip>
exits
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is
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10) From: Owen Davies
Among other comments, Dan Bollinger wrote:
<Snip>
I was thinking you'd stick the thermocouple in the open end of the drum and
bend it at a right angle, between two rows of vanes, so that it would always
be well buried in the beans.  You'd have to stiffen it up against the
sideways force of the beans, but that shouldn't be too difficult.
<Snip>
Are you planning to do Mike McK-style manual controls or some thing more
elaborate?
Owen
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

11) From: Ben Treichel
Mike McGinness wrote:
<Snip>
If thats the case then my wife did a 'drum' solo this morning when I 
told her how I spent my remaining Chistmas & Bonus money.
The opening cadance was '$200 for a grinder are you ......" :-(
<Snip>

12) From: Dan Bollinger
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and
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always
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One option you might consider, but I rejected, was to use a hollow,
stationary shaft through the drum. Attached perpendicularly to the shaft is
another hollow tube pointing downward.  The TC is at the bottom of this tube
with the lead running inside the tube and shaft out to your
thermometer/thermostat.
<Snip>
roasters.
<Snip>
I plan on using the programmable profile roaster that Jeff, Ben, and others
are designing.  One reason I wanted a thin-walled drum and fan forced
electrical heat supply was that the thermal mass would be extremely low.
This means I can make the roast follow almost any profile I want.  I can
also run the thing on manual and let the controller 'learn' what I'm doing
and then repeat it later.  Dan
<Snip>
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

13) From: AlChemist John
Sometime around 09:25 1/25/2003, Owen Davies typed:
<Snip>
Yes.  That is basically what my design incorporates.  I am planning on just 
switching off the heat and forcing more air through the drum for cooling.
--
John Nanci 
AlChemist at large
Roasting and Blending by Gestalt
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

14) From: Owen Davies
<Snip>
just
<Snip>
Yeah, I figured either that or dump it into a colander and blow on it.
Owen
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

15) From: Ed Needham
I think you are asking a question that has no answer.  Some like drum
roasting and some like air roasting.  Some beans do well with one and some do
well with the other.  Some people like beans roasted in an air roaster that
others don't like, and vice versa.  Bottom line is...yes and no.  Or is that
no and yes?
-air roasting is generally faster than drum roasting (but not always)
-air roasting 'tends' to bring out brighter characteristics in the beans (but
not always).
-drum roasters tend to bring out more body in the beans (but not always)
-large air roasters are a bear to build (but not always)
-BBQ drum roasters are easy to build (but not always)
-air roasters agitate the beans using forced air
-drum roasters agitate the beans by stirring them in a rotating drum
-some air roasters manually stir the beans
-some drum roasters blow air to help roast the beans
Any questions?
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
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16) From: Ben Treichel
Best summary I've seen.
Ed Needham wrote:
<Snip>
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

17) From: Ed Needham
The only thought I have is..."Go for it!"  It sounds like a really cool
concept.
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
****************************************
**********************************************

18) From: john kangas
Me, too! My drum's different, it will rotate, and eventually use propane 
heat via heat exchanger and forced air. I finally got some vanes made up 
this last week, and tacked them in Friday. 4 vanes, 2 angled one way, and 2 
the other way. I weighed the drum, with vanes and one end tacked on... 9.6 
lb.!
I'll try to track down a digital camera next weekend.
I like the heat blower idea, that would be a good way to experiment with 
airflow and heat requirements before actually firing the thing up, I'll have 
to track one down!
John (enjoying the last cup of our second to last batch of Kii)
<Snip>
MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*.  http://lists.sweetmarias.com/mailman/listinfo/homeroast">http://join.msn.com/?page=features/virushomeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

19) From: Mike McGinness
From: "Ed Needham" 
<Snip>
(but
<Snip>
Great explanation, perfect for a HOME ROASTER T-SHIRT!!!
MM;-) aka Kona Konnaisseur miKe mcKoffee
Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

20) From: Ed Needham
I can see it now...
HOMEROASTER emblazoned across the shoulders like those 'SECURITY' shirts you
see at public events.  A Poppery II stenciled on the front .
Ed Needham
To Absurdity and Beyond!http://www.homeroaster.comed
****************************************
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