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 KKTO - My Humble Turbo Roaster
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| Koffee Kosmo |
Posted on 11/10/2018 11:25 PM
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 Administrator  Posts: 1620 Joined: December 31, 2008 |
Quote Wiz Kalita wrote: Does this mean that the pasta pot version performs worse than with the suspended colander? Also: Will a motor with 2 kgf/cm torque be strong enough? Both fitted or suspended colander / roast chambers work The pasta pot version was developed because its easier to construct and this current design followed the suspended roast chamber version first released about 2008/9 Re Motor Always use a motor that can handle the job by a factor of 2 or as close as possible 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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| Wiz Kalita |
Posted on 11/11/2018 8:34 AM
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 Newbie  Posts: 49 Joined: August 06, 2018 |
Thank you for the information. I don't doubt that it roasts equally well, but does the chaff collection work? Since there isn't much of a gap on the sides. |
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| renatoa |
Posted on 11/11/2018 9:12 AM
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Administrator Posts: 3010 Joined: September 30, 2016 |
I see an issue for both roasting recipients: the lateral holes. I would close them with alu/kapton tape, if existing, and let only the holes in the bottom. This way a circular/toroidal airflow is forced through the bean mass, without lateral losses/dispersion. |
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| Koffee Kosmo |
Posted on 11/11/2018 4:09 PM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote Wiz Kalita wrote: Thank you for the information. I don't doubt that it roasts equally well, but does the chaff collection work? Since there isn't much of a gap on the sides. I have completed over 3 thousand roasts in my roaster The chaff removal to the outer chamber is in the ball park of over 95% on both designs https://koffeekos...ogspot.com 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 |
Posted on 11/11/2018 4:40 PM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote renatoa wrote: I see an issue for both roasting recipients: the lateral holes. I would close them with alu/kapton tape, if existing, and let only the holes in the bottom. This way a circular/toroidal airflow is forced through the bean mass, without lateral losses/dispersion. If this design was fully manufactured then this would be an option Possibly as a limited number of slits on the sides and several on the base Exit points on the sides are needed as the chaff in the initial crack stages tends to fly above the roast in a vortex looking for a way out As the chaff becomes dryer and collides to become smaller in size it exits from the side holes that are exposed above the agitating beans However most of the chaff exits from the bottom But that is not due to air pressure force alone - it?s the grinding action and weight of the agitating beans with fan assistance that pushes the chaff down and out from the base holes, the Turbo Oven has a mild fan 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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| renatoa |
Posted on 11/12/2018 1:24 AM
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Administrator Posts: 3010 Joined: September 30, 2016 |
As I see in my machine, the whole acts somewhat is a giant cyclone. Or as a reversed flow Stronghold S7. The air (and chaff) is sucked in the middle, by the turbine, then, passing through blades a peripheral vortex is generated along the lid and then the walls, where the chaff descend spiraling, relative slowly, due to rotating air stream. If chaff not captured somewhere along the outer pot bottom corners, to be evacuated, it will be sucked in the middle of the roasting pot, obscuring about 1/4 of central area, around the shaft. Will come later with a video of the machine fitted with some strings, to see air stream direction in the critical points. |
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| Wiz Kalita |
Posted on 02/27/2019 1:59 AM
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Newbie Posts: 49 Joined: August 06, 2018 |
How critical is the adapter ring? I don't see myself being able to make one, so I'm more likely to plop the lid down on a silicone gasket and aligning by permanent marker. |
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| renatoa |
Posted on 02/27/2019 2:27 AM
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Administrator Posts: 3010 Joined: September 30, 2016 |
You mean the ring on which the turbo lid is placed ? It can be found usually as spare/replacement... they are somewhat standard, at least in Europe, 32 cm everywhere. Seems close size in US, just check dimensions with your lid: https://www.ebay....2365498339 When I build such machine for someone, I am looking to buy the lid together with the ring, for me is part of the design. |
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| Wiz Kalita |
Posted on 02/27/2019 7:24 AM
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Newbie Posts: 49 Joined: August 06, 2018 |
That's the part! I didn't know these rings are commercially available, I'll see if I can find one that fits my lid. Thanks! |
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| renatoa |
Posted on 02/27/2019 7:36 AM
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Administrator Posts: 3010 Joined: September 30, 2016 |
Please be aware this ring volume is not 12l as falsely advertised in the bid title, but about 6.5l, because the height is about 8 cm. I am fitting this ring on a bottom tray, with 4 cm high walls, to achieve the minimum recommended radiant to beans distance, of about 3", i.e. 8 cm. Edited by renatoa on 02/27/2019 12:57 PM |
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| Wiz Kalita |
Posted on 02/27/2019 8:44 AM
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Newbie Posts: 49 Joined: August 06, 2018 |
I was going to handle that by suspending the inner chamber using slotted L-brackets, but getting some extra space from the ring is very practical. |
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| Koffee Kosmo |
Posted on 03/04/2019 4:27 PM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Total roast chamber volume You need to add the curvature of the Turbo Oven in the calculations I encourage you keep as close as possible to the design principles and make small design enhancements if your skill set is capable of doing so Any design can be enhanced but one needs the tools and the skill to do so Keep us in the loop with drawings and photos 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 |
Posted on 07/17/2019 5:14 AM
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Administrator Posts: 1620 Joined: December 31, 2008 |
A quick notice for the KKTO roaster I have had many many emails asking for me to make available a fully manufactured and assembled roaster To that end I am willing to start production of the new KKTO if I have orders of 100 units This number keeps the cost down If interested - follow the link for design update information and take the survey and register your interest http://koffeekosm... Many Thanks 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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| JackH |
Posted on 07/17/2019 2:40 PM
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 Administrator Posts: 1809 Joined: May 10, 2011 |
It would be great to see you back with the KKTO, Mr Kosmo! Will you still be using a converted turbo oven to drive it? ---Jack
KKTO Roaster. |
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| renatoa |
Posted on 07/17/2019 3:16 PM
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Administrator Posts: 3010 Joined: September 30, 2016 |
Reading from the page linked above: Quote To keep the unit costs to a minimum the Turbo Oven won't be included ... so I think this means he is using a regular lid... |
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| Koffee Kosmo |
Posted on 07/17/2019 5:13 PM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote JackH wrote: It would be great to see you back with the KKTO, Mr Kosmo! Will you still be using a converted turbo oven to drive it? Yes a regular Turbo Oven will still be used as a heat source However should you choose to do so one can use a heat gun For American enthusiasts- the voltage is different - so it makes sense to purchase that component locally 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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| JackH |
Posted on 07/18/2019 2:43 AM
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Administrator Posts: 1809 Joined: May 10, 2011 |
That makes sense. Plus the safety concerns of removing the thermostat and other electrical modifications.
---Jack
KKTO Roaster. |
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| Koffee Kosmo |
Posted on 07/18/2019 7:39 AM
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Administrator Posts: 1620 Joined: December 31, 2008 |
The project will only go ahead if the required order numbers reach 100 units I will personally assemble and test all the roasters myself to keep costs down The original design is now 10 + years old and going strong So you can be assured that the product will be engineered for long life 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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| renatoa |
Posted on 08/08/2019 9:58 AM
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Administrator Posts: 3010 Joined: September 30, 2016 |
Walking today in a food facility I seen a tool that spark my imagination... what a great starting hardware for a turbo oven roaster ! All you need is to find an appropriate sieve/pasta strainer and start building. The device I seen looks identical to this, all dimensions: https://www.lelon...Sale-I.htm ... but searching for "dish warmer" you can find a lot of other layouts that could give you more ideas. |
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| Koffee Kosmo |
Posted on 08/09/2019 1:29 AM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote renatoa wrote: Walking today in a food facility I seen a tool that spark my imagination... what a great starting hardware for a turbo oven roaster ! All you need is to find an appropriate sieve/pasta strainer and start building. The device I seen looks identical to this, all dimensions: https://www.lelon...Sale-I.htm ... but searching for "dish warmer" you can find a lot of other layouts that could give you more ideas. That pot set idea has promise As always one needs to stick to the volume parameters I have set down for best 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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| renatoa |
Posted on 08/09/2019 2:21 AM
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Administrator Posts: 3010 Joined: September 30, 2016 |
It is 9.8 liters, so in your range of 9-12, if I remember well. |
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| Koffee Kosmo |
Posted on 08/09/2019 6:00 AM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote The actual overall volume range including the base pot & Turbo Oven dome is 7 to 9 lt - So 8 lt is ideal 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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| blumes |
Posted on 05/23/2020 10:26 AM
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Newbie Posts: 5 Joined: November 28, 2014 |
hi, is this ok for a new kkto? https://www.ikea....-70238999/ or is this better? https://www.amazo...amp;sr=8-8 thanks ciaooo |
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| renatoa |
Posted on 05/23/2020 11:19 AM
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Administrator Posts: 3010 Joined: September 30, 2016 |
I am using this steamer from Ikea in my actual workhorse machine: https://www.ikea....-30152346/ ... but mine is not a 100% KK design, rather something closer to a SCTO, my oven being flatter, and using the whole 32 cm lid size/area. You can see here in action, at the end of the cooling phase: https://www.youtu...acgv5eyX0o You have also the option to use this sieve: https://www.ikea....-90011829/ ... that could allow for a better agitation if matched with a higher speed motor, like those from a bread machine, in the 200 RPM ballpark. This way you could mimic a centrifugal roaster, the high speed would throw the beans laterally on the walls, and the curved bottom will help them to come back to the center by gravitation. |
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| Koffee Kosmo |
Posted on 05/24/2020 12:40 AM
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Administrator Posts: 1620 Joined: December 31, 2008 |
Quote blumes wrote: hi, is this ok for a new kkto? https://www.ikea....-70238999/ or is this better? https://www.amazon.it/Kr%C3%BCger-SPA-Pentola-spaghetti-acciaio/dp/B00GHDLYKY thanks ciaooo I tend to favour this pot set https://www.amazo...eyHM8D3FEo KK Edited by JackH on 05/24/2020 3:05 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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