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homeroaster
10/04/2022 7:11 PM
I'm still alive. Haven't posted here for a while. Still roasting about 20 lb a week. Life is good. Find me on Facebook.

allenb
10/03/2022 3:29 PM
carloswlkr Welcome

allenb
10/03/2022 12:06 PM
HI Michael, go to consumer zone, java trading company and first post is basic rules. PM me with any needed clarifications. Cheers

Michael Kirkpatrick
10/03/2022 11:47 AM
Good morning! what would be the best way to post a coffee roaster for sale? Thanks

renatoa
10/03/2022 2:12 AM
@ittiponcr and welcome cup adrianalindgren

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KKTO - My Humble Turbo Roaster
Koffee Kosmo

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.
 
Wiz Kalita
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.
 
renatoa
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.
 
Koffee Kosmo

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.
 
Koffee Kosmo

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.
 
renatoa
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.
 
Wiz Kalita
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.
 
renatoa
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.
 
Wiz Kalita
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!
 
renatoa
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
 
Wiz Kalita
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.
 
Koffee Kosmo
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.
 
Koffee Kosmo
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.
 
JackH
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.
 
renatoa
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...
 
Koffee Kosmo

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.
 
JackH
That makes sense. Plus the safety concerns of removing the thermostat and other electrical modifications.
---Jack

KKTO Roaster.
 
Koffee Kosmo
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.
 
renatoa
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.
 
Koffee Kosmo

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.
 
renatoa
It is 9.8 liters, so in your range of 9-12, if I remember well.
 
Koffee Kosmo

Quote

renatoa wrote:

It is 9.8 liters, so in your range of 9-12, if I remember well.


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.
 
blumes
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
 
renatoa
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.
 
Koffee Kosmo

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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