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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Turbo Oven Roasters

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KKTO - My Humble Turbo Roaster
seedlings	#26 Posted on 01/14/2009 7:52 AM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	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	#27 Posted on 01/14/2009 8:07 AM
Administrator Posts: 1620 Joined: December 31, 2008	Quote 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 8:41 AM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Koffee Kosmo	#28 Posted on 01/15/2009 10:31 PM
Administrator Posts: 1620 Joined: December 31, 2008	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: I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Koffee Kosmo	#29 Posted on 01/15/2009 10:40 PM
Administrator Posts: 1620 Joined: December 31, 2008	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: Edited by Koffee Kosmo on 01/15/2009 11:28 PM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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seedlings	#30 Posted on 01/16/2009 8:14 PM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	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	#31 Posted on 01/17/2009 12:01 AM
Administrator Posts: 1620 Joined: December 31, 2008	Quote 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 8:12 AM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Koffee Kosmo	#32 Posted on 01/20/2009 7:04 AM
Administrator Posts: 1620 Joined: December 31, 2008	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 6:10 AM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Koffee Kosmo	#33 Posted on 01/22/2009 6:19 AM
Administrator Posts: 1620 Joined: December 31, 2008	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: Edited by Koffee Kosmo on 01/22/2009 6:21 AM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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seedlings	#34 Posted on 01/22/2009 8:15 AM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	: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	#35 Posted on 01/22/2009 7:00 PM
Administrator Posts: 1620 Joined: December 31, 2008	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: I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Island Addict	#36 Posted on 01/22/2009 10:44 PM
1/4 Pounder Posts: 55 Joined: August 13, 2008	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	#37 Posted on 01/22/2009 11:16 PM
Administrator Posts: 1620 Joined: December 31, 2008	Quote 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 Quote 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. Quote 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 Quote 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 11:31 PM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Koffee Kosmo	#38 Posted on 01/23/2009 7:56 AM
Administrator Posts: 1620 Joined: December 31, 2008	Quote 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. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Koffee Kosmo	#39 Posted on 01/23/2009 11:24 PM
Administrator Posts: 1620 Joined: December 31, 2008	Quote 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 11:26 PM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Island Addict	#40 Posted on 01/25/2009 7:48 PM
1/4 Pounder Posts: 55 Joined: August 13, 2008	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


Koffee Kosmo	#41 Posted on 01/25/2009 9:47 PM
Administrator Posts: 1620 Joined: December 31, 2008	Quote 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: Edited by Koffee Kosmo on 01/25/2009 10:42 PM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Island Addict	#42 Posted on 02/04/2009 7:56 PM
1/4 Pounder Posts: 55 Joined: August 13, 2008	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


seedlings	#43 Posted on 02/04/2009 8:11 PM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	Awesome! Island Rob, maybe you could start another thread do document the whole process?? CHAD Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover


Koffee Kosmo	#44 Posted on 02/04/2009 9:13 PM
Administrator Posts: 1620 Joined: December 31, 2008	Quote 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: Edited by Koffee Kosmo on 02/04/2009 9:31 PM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Island Addict	#45 Posted on 02/04/2009 9:44 PM
1/4 Pounder Posts: 55 Joined: August 13, 2008	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


Koffee Kosmo	#46 Posted on 02/04/2009 10:49 PM
Administrator Posts: 1620 Joined: December 31, 2008	Position the fitting to be right on the bottom of the pot or false bottom KK Edited by Koffee Kosmo on 02/04/2009 11:06 PM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Koffee Kosmo	#47 Posted on 02/05/2009 5:30 PM
Administrator Posts: 1620 Joined: December 31, 2008	Here is a drawing Rob Position of chaff catcher KK Koffee Kosmo attached the following image: Edited by Koffee Kosmo on 02/05/2009 5:32 PM I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Gella	#48 Posted on 02/11/2009 5:07 AM
Newbie Posts: 5 Joined: January 17, 2009	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


Koffee Kosmo	#49 Posted on 02/11/2009 9:46 AM
Administrator Posts: 1620 Joined: December 31, 2008	That is terrific and well done Gella :Clap: 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 Quote 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 I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Gella	#50 Posted on 02/18/2009 3:02 AM
Newbie Posts: 5 Joined: January 17, 2009	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 3:09 AM

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