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My Humble Turbo Roaster
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| seedlings |
Posted on 01/14/2009 06:52
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Super Admin
Posts: 3047
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Wow! Is that picture the Kenyan? Very even, nice looking, City+ roast! How long does it take to get 600g roasted?
CHAD
"You know, I think that horse is getting deader." |
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| Koffee Kosmo |
Posted on 01/14/2009 07:07
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Super Admin
Posts: 616
Joined: 31.12.08
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seedlings wrote:
Wow! Is that picture the Kenyan? Very even, nice looking, City+ roast! How long does it take to get 600g roasted?
CHAD
Yep thats the picture of the Kenyan
Roasting times are -
Normal as any roast Chad, you just need to follow a heat curve
Chad do you know how to upload an excel spread sheet
I would like to show you the excel graph of the heat curve of this roast
The excel template graph was kindly supplied from a fellow coffee snob here in Australia
KK
Edited by Koffee Kosmo on 01/14/2009 07:41
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Koffee Kosmo |
Posted on 01/15/2009 21:31
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Super Admin
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Just an update of how I fitted the thermocouple
What I used was some old press button stud fasteners normally used for canvas tarps
They come in 2 pieces those sharp spikes go through the pot and a small holding plate then bent over to secure.
I fitted 2 of them to allow for the height adjustment of the bean chamber
KK
Koffee Kosmo attached the following image:
[51.99Kb]
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Koffee Kosmo |
Posted on 01/15/2009 21:40
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Super Admin
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This is the bean chamber mod with the perforated plate
It was needed because some beans would fall or squeeze through the holes
The perforated plate has small diameter holes and as an added advantage I believe it helps with even heat distribution to stop burning and tipping
Chad if you could make one of these diffusers for your BM extend the agitator to suit the new height you will have a perforated diffuser on the cheap 
KK
Koffee Kosmo attached the following image:
[75.15Kb]
Edited by Koffee Kosmo on 01/15/2009 22:28
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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Posted on 01/16/2009 19:14
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Super Admin
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Where is the thermocouple in relationship to the beans? Above, below or in the bean mass?
CHAD
"You know, I think that horse is getting deader." |
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| Koffee Kosmo |
Posted on 01/16/2009 23:01
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Super Admin
Posts: 616
Joined: 31.12.08
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Where is the thermocouple in relationship to the beans? Above, below or in the bean mass?
CHAD
Hi Chad
The thermocouple is positioned in the bean mass
If you click the photo of the bean basket above to enlarge it
You will see under that clip thing 3 holes I use the bottom hole
The agitator is angled inwards at that point (made that way on purpose) and the probe goes in about 1/2 inch right in the bean mass
KK
Edited by Koffee Kosmo on 01/17/2009 07:12
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Koffee Kosmo |
Posted on 01/20/2009 06:04
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Super Admin
Posts: 616
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I have compiled an online slide presentation of the roaster build
Should you want to build one for yourself
http://docs.googl...amp;size=l
Comments or questions are welcome
KK
Edited by Koffee Kosmo on 01/22/2009 05:10
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Koffee Kosmo |
Posted on 01/22/2009 05:19
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Super Admin
Posts: 616
Joined: 31.12.08
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Keeping you updated
RE: Chaff separation
Just a photo of how the chaff rests in the bottom of the pot during and after the roast
A point to note the roasting beans do not come into contact again during the roasting process once the husk separates from the bean
It was built into the design
Due to the Turbo Ovens fan forced action the chaff spins in a small whirlwind under the beans. The chaff colour is cream
When the TO is taken off I am left with a ball of chaff around the drive shaft as its final resting place
Great results
KK
Koffee Kosmo attached the following image:
[48.61Kb]
Edited by Koffee Kosmo on 01/22/2009 05:21
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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Posted on 01/22/2009 07:15
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Super Admin
Posts: 3047
Joined: 27.06.07
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Wonderful presentation! I want one! Hmmm...
Are you goning to patent it or copyright it? Can we make one too?
CHAD
"You know, I think that horse is getting deader." |
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| Koffee Kosmo |
Posted on 01/22/2009 18:00
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Super Admin
Posts: 616
Joined: 31.12.08
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Chad
Here is a photo of the very roast that left that chaff behind
PNG Jiwaka Peaberry 500 grams or 1 pound
I am very pleased with how even it roasts, no burning no tipping
Photo taken in natural sunlight
KK
Koffee Kosmo attached the following image:
[83.88Kb]
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Island Addict |
Posted on 01/22/2009 21:44
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1/3 Pounder
Posts: 58
Joined: 13.08.08
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Thanks for posting this. It looks like a very compelling design. Thanks especially for the very detailed instructions. I'm seriously considering building something like this.
A couple of questions:
What is the optimal size of the holes? I have a colander that might work, but the holes are very small. I could drill them out if necessary, but I don't want to make them too big.
Other than the design of the stirrer, is there any limit on how small a batch can be? I would ideally like a roaster than can do 225-450 gram batches well, but also roast 150 gram samples without loss of quality. Is there an optimal chamber diameter for a given batch size?
How do you handle cooling and dumping of beans at the end of the roast?
Is any particular turbo roaster brand well suited or not suited for roasting? Will any 1200 watt model work?
Rob |
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| Koffee Kosmo |
Posted on 01/22/2009 22:16
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Super Admin
Posts: 616
Joined: 31.12.08
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A couple of questions:
What is the optimal size of the holes? I have a colander that might work, but the holes are very small. I could drill them out if necessary, but I don't want to make them too big.[
Thanks for your question IA aka Rob
The holes that are on the perforated plate are a perfect size @ 4.5mm or just under 1/4 inch
Other than the design of the stirrer, is there any limit on how small a batch can be? I would ideally like a roaster than can do 225-450 gram batches well, but also roast 150 gram samples without loss of quality. Is there an optimal chamber diameter for a given batch size?
The agitator was a brainstorm of an idea because I needed to do small or large batches. That said the design is such that you can build several stirrers to suit any situation
I have tested several 100-150 gr batches without problems however you will need to monitor the heat curve closely as smaller batches get to first crack (1C) quicker.
How do you handle cooling and dumping of beans at the end of the roast?
Although the TO has a cooling feature it is not quick enough so I use my exhaust fan powered bucket cooler total cost $2.00 due to some free buckets (will post some build instructions in the cooler section soon)
The bean roast insert is taken out while wearing an oven glove and dumped in the cooler
Is any particular turbo roaster brand well suited or not suited for roasting? Will any 1200 watt model work?
Yes any 1200W TO will work the crucial thing is the volume of the pot
To much pot volume = less heat control and smaller batches
Thus I needed to make a false bottom to reduce volume.
Dont forget to view the slide presentation of the build with a lot more text and photo detail
It is always being updated as questions and answers are received/answered so every time you visit you may find something new
However I am only to pleased to help here on this forum as I visit several times daily
Here it is again
http://docs.googl...amp;size=l
KK
Edited by Koffee Kosmo on 01/22/2009 22:31
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Koffee Kosmo |
Posted on 01/23/2009 06:56
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Super Admin
Posts: 616
Joined: 31.12.08
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seedlings wrote:
Wonderful presentation! I want one! Hmmm...
Are you goning to patent it or copyright it? Can we make one too?
CHAD
Chad
I know U want one
U know U want one
No patent pending & its free from me to you (and others)
So now you can make one 2
KK
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Koffee Kosmo |
Posted on 01/23/2009 22:24
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Super Admin
Posts: 616
Joined: 31.12.08
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Other than the design of the stirrer, is there any limit on how small a batch can be? I would ideally like a roaster than can do 225-450 gram batches well, but also roast 150 gram samples without loss of quality. Is there an optimal chamber diameter for a given batch size?
Hi again Island Addict
So you can see for yourself I have made a video for you
To view the agitator in action
It starts with an empty chamber
I add 100 grams of green beans
I then add another 50 grams
In this way you can view both amounts
My assessment is
You cant get better stirring for a small batch
What do you think Rob??
KK
Edited by Koffee Kosmo on 01/23/2009 22:26
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Island Addict |
Posted on 01/25/2009 18:48
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1/3 Pounder
Posts: 58
Joined: 13.08.08
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Thanks for the video! This looks like it will suit my needs in terms of range of batch sizes.
I'd like to use 2 thermocouples -- one for bean temp and one for environmental temp. Any thoughts on the best location for the ET thermocouple?
I'm starting to assemble parts. 
Rob |
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| Koffee Kosmo |
Posted on 01/25/2009 20:47
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Super Admin
Posts: 616
Joined: 31.12.08
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Island Addict wrote:
Thanks for the video! This looks like it will suit my needs in terms of range of batch sizes.
I'd like to use 2 thermocouples -- one for bean temp and one for environmental temp. Any thoughts on the best location for the ET thermocouple?
I'm starting to assemble parts.
You can place your TC probe on or close to the centreline of the pot
It may be a good idea to get BBQ temp gauge as an alternative
I have received a few questions regarding
The sliding height adjustable brackets and the basket
So I have come up with an alternative arrangement that still does the same job
The brackets can be made as one (1) unit
Picture a basketball ring with 2 backboard brackets. But made with thinner gauge steel or sheet
I have found a suitable insert/bean roast chamber
It is known as a Chinese colander 20 cm dia is a good size
The shape is good with relatively straight sides and coming in at the rounded edge of the suitably flat bottom, and the holes are small enough to contain the beans
You may need to make a wire handle to remove when hot
Here is a drawing
KK
Koffee Kosmo attached the following image:
[32.78Kb]
Edited by Koffee Kosmo on 01/25/2009 21:42
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Island Addict |
Posted on 02/04/2009 18:56
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1/3 Pounder
Posts: 58
Joined: 13.08.08
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Turbo oven and gear motor arrived today. Still waiting on collander and other parts. . . . Just wondering about chaff in the convection fan/heating element. It looks like it might be a good idea to add a stainless steel screen over the fan to keep chaff out, or is that not necessary?
I'm also thinking of boosting the voltage on the fan for greater circulation. Probably not necessary, but I have the parts for it from a previous project so might be worth trying.
Rob |
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Posted on 02/04/2009 19:11
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Super Admin
Posts: 3047
Joined: 27.06.07
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Awesome!
Island Rob, maybe you could start another thread do document the whole process??
CHAD
"You know, I think that horse is getting deader." |
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| Koffee Kosmo |
Posted on 02/04/2009 20:13
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Super Admin
Posts: 616
Joined: 31.12.08
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Island Addict wrote:
Turbo oven and gear motor arrived today. Still waiting on collander and other parts. . . . Just wondering about chaff in the convection fan/heating element. It looks like it might be a good idea to add a stainless steel screen over the fan to keep chaff out, or is that not necessary?
I'm also thinking of boosting the voltage on the fan for greater circulation. Probably not necessary, but I have the parts for it from a previous project so might be worth trying.
I repeat Chads comment "Ausome"
I have not had a problem with the chaff going into the TO's element but the TO should have a S/S shroud already over the element
While roasting the chaff can be clearly be seen spinning on the bottom of the pot completely separate from the beans 4 inches away and 8 inches away from the TO element.
However if you want to try it with extra fan power I don't see any problems
I would be inclined to set the fan to a variable speed adjustment It will be another way to to vary and control the temperature at any part of the roast.
If you have a chaff related problem as a direct result of the extra fan power you may require a chaff collector
I have a drawing of a chaff collector
(see Picture)
Time the RPM of the motor to a range of 42 rpm to 55 rpm as optimal
If you need images of specific items you only need to ask
Keep me in the loop
I am always here to help
KK
Koffee Kosmo attached the following image:
[35.11Kb]
Edited by Koffee Kosmo on 02/04/2009 20:31
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Island Addict |
Posted on 02/04/2009 20:44
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1/3 Pounder
Posts: 58
Joined: 13.08.08
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I'm thinking about a chaff collector. Where do you think would be the best place to put it? On the side of the pot? On the bottom?
Rob |
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| Koffee Kosmo |
Posted on 02/04/2009 21:49
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Super Admin
Posts: 616
Joined: 31.12.08
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Position the fitting to be right on the bottom of the pot or false bottom
KK
Edited by Koffee Kosmo on 02/04/2009 22:06
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Koffee Kosmo |
Posted on 02/05/2009 16:30
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Super Admin
Posts: 616
Joined: 31.12.08
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Here is a drawing Rob
Position of chaff catcher
KK
Koffee Kosmo attached the following image:
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Edited by Koffee Kosmo on 02/05/2009 16:32
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Gella |
Posted on 02/11/2009 04:07
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Newbie
Posts: 5
Joined: 17.01.09
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Hi KK
this is Gella have built the turbo roaster and roasted my first batch of greens tonight brewed up a cup just perfect. The only thing I did different was I lagged and cladded the outer pot to keep the heat in and to make it a little bit safe as to not to burn yourself.Best cup of coffee ever had.
Regards
G |
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| Koffee Kosmo |
Posted on 02/11/2009 08:46
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Super Admin
Posts: 616
Joined: 31.12.08
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That is terrific and well done Gella
Its been a while since your PMs
It looks like you have been busy head down tail up & all the building instructions were sufficient
You are the first to make this roaster design (apart from the original)
And then there were 2 & hopefully more to follow
The only thing I did different was I lagged and cladded the outer pot to keep the heat in and to make it a little bit safe as to not to burn yourself.Best cup of coffee ever had.
Good Idea and good adaptation
In Brisbane Australia we are almost in permanent summer so I don't have the heat loss problem but it is a good safety option
Gella when you get a chance please post a photo of the roaster and some roast results
KK
koffeekosmo.com.au I home roast and I like it
Bezzera BZ40:BNZ MD74 Grinder: 7 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer: |
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| Gella |
Posted on 02/18/2009 02:02
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Newbie
Posts: 5
Joined: 17.01.09
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Hi kk
Have got some pictures not sure how to send but have given it a go hope this works.
Regards
G
Edited by Gella on 02/18/2009 02:09 |
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