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KKTO - My Humble Turbo Roaster
Koffee Kosmo
Just keeping you in the loop
Here is an early short video of the early Turbo roaster tests before any mods

More videos to come of the finished roaster as soon as I put on my directors hat on ;)

[video]http://video.google.com/videoplay?docid=2422688025149101787[/video]

KK
Edited by Koffee Kosmo on 01/23/2009 5:30 PM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
seedlings
Hire James Cameron (or Tim Burton if you prefer) and let's see the full length version!

Very nice sneek peek. The perforations and airflow concept is just outstanding!

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
Brewster
Nice video, KK! Sometimes it doesn't come together until you see it in action...

That was a good looking roast!
Wendell

If the shoe fits, wear it.
If the shoe doesn't fit, you've the wrong shoe!
 
Koffee Kosmo
I have completed all the tests for the roaster and have reached my goal for 600grams of green beans

I am confident that it will roast up to 750grams in its current configuration (pot volume reduced by 1/3 with an insulated false bottom)

I am also confident that if I reduce the pot volume to half from the original the roaster will be capable to roast 1kg (2 pounds)

Just roasted today
600 grams of Kenya Ritti AA
Camera set on Macro and flash on
This is a beautiful and even roast
I also got goose bumps and a feeling of WOW what a roast
See photo

Also here is a link of another short 20 sec video on how the components fit together
[video]http://video.google.com/videoplay?docid=-7943559104339034107&hl=en[/video]

NOTE
I have uploaded 4 short videos so to see all of them just click other videos from this user to view all
Most only go 30-35 seconds

I have learnt that the video quality degrades if one zooms in so I have to redo some others that did not make the cut B)

Enjoy the video via this link
[video]http://video.google.com/videoplay?docid=-2538224871688082370[/video]
KK
Koffee Kosmo attached the following image:
img_kenyaritti.jpg

Edited by Koffee Kosmo on 01/23/2009 5:39 PM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Koffee Kosmo
For some reason I could not attach the photo on my last post so here is a photo of that roast

I will try another image of the same roast just not as close up B)


KK
Koffee Kosmo attached the following image:
img_5556.jpg

Edited by Koffee Kosmo on 01/14/2009 12:13 AM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
seedlings
Wow! Is that picture the Kenyan? Very even, nice looking, City+ roast! How long does it take to get 600g roasted?

:Clap:

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
Koffee Kosmo
seedlings wrote:
Wow! Is that picture the Kenyan? Very even, nice looking, City+ roast! How long does it take to get 600g roasted?

:Clap:

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 2:41 AM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Koffee Kosmo
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:
img_thermocouple.jpg

I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Koffee Kosmo
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:
img_5534.jpg

Edited by Koffee Kosmo on 01/15/2009 5:28 PM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
seedlings
Where is the thermocouple in relationship to the beans? Above, below or in the bean mass?

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
Koffee Kosmo
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 2:12 AM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Koffee Kosmo
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 12:10 AM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Koffee Kosmo
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:
img_5813.jpg

Edited by Koffee Kosmo on 01/22/2009 12:21 AM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
seedlings
:BowDown: :Clap:

Wonderful presentation! I want one! Hmmm...
:BigHug:
Are you goning to patent it or copyright it? Can we make one too?

CHAD
Roaster: CoffeeAir II 2# DIY air roaster
Grinder: Vintage Grindmaster 500
Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover
 
Koffee Kosmo
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:
img_5814.jpg

I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Island Addict
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
 
Koffee Kosmo
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 5:31 PM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Koffee Kosmo
seedlings wrote:
:BowDown: :Clap:

Wonderful presentation! I want one! Hmmm...
:BigHug:
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 :BigHug:


KK
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Koffee Kosmo
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
[video]http://video.google.com/videoplay?docid=-5598275520678947945[/video]
Edited by Koffee Kosmo on 01/23/2009 5:26 PM
I home roast and I like it
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
Island Addict
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. ThumbsUp

Rob
 
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