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Brainiac
Join Date:July 27, 2007
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Hello from Berkeley, California
Tjames
Iíve been roasting on/off for a while but mostly unsuccessfully with a cast iron, heat gun, or some combo of both. Iím building a custom roaster on a budget for small batches. Itís still in the drafting phase but Iím looking at an insulated metal box design with PID controlled heating element, air recirculation fan, small steel rotisserie drum, and a couple thermocouples hooked up to Artisan to provide profile data. Still unsure of which heating element to use, a standard stove coil is all I am thinking.

I joined the forum to look for ideas and learn more about what makes a good roaster. Thanks for having me.
renatoa
I recommend you too look instead to a turbo oven lid based build, like SCTO or KKTO.
Simpler to build than an oven/drum assembly, and better heat circulation.
Cheaper... also, simpler to measure bean temp.
gustavomonarin
@renatoa you mentioned in another post about a design with air recirculation.

Have you already shared somewhere?
renatoa
TO recirculates by design the air inside the oven that hosts the roast insert.
Check attached picture for a better image.
Some air, including smoke, is exhausted by a second turbine, identical with the heater turbine, placed in a compartiment above the heater support plate.
The role of the second turbine is cooling, to not allow radiated heat go into upper plastic case hosting the thermostat and timer.
The two turbines are the black parts.

...
renatoa attached the following image:
to_airflow_diagram.jpg

Edited by renatoa on 03/11/2021 1:30 AM
Koffee Kosmo

Quote

renatoa wrote:

I recommend you too look instead to a turbo oven lid based build, like SCTO or KKTO.
Simpler to build than an oven/drum assembly, and better heat circulation.
Cheaper... also, simpler to measure bean temp.


I agree on the above suggestion

KK
I home roast and I like it. Designer of the KKTO
Roaster Build information
https://forum.hom...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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