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Hi from USA
allenb
Top  #21 Print Post
Posted on 02/10/2023 6:53 PM

Quote

Koffee Kosmo wrote:

Quote

renatoa wrote:

He means something as in the attached image.
A round cut to reveal completely the turbine, for full unobstructed airflow, and no chaff clogging, and leave only one inch ring for lamp protection.

A single level power roast, other than maximum power, I am afraid would

be far from ideal.
You have attached a typical roast of mine, with power control steps generated by TC4ESP, based on some algorithm.
Somewhat unattended until approaching development.
The start power is 32%, used for preheat somewhere in the 180C ballpark, the maximum power (around DE) is about 66%, then lowered to 58% in the FC-development phase.
Probably a two steps approach could work. I mean start with 32%, TP around 1 minute, soak 1 minute, set to 48% at minute 2, then 64% at minute 3, and keep there to the end.
But a single level start to end... Shock





That is exactly “as in the photo” of how I have cut away the defuser plate

KK

I’m glad I was able to view this photo. My turbo head baffle does not obstruct any of the IR emission from the halogen lamp so I will need to add a baffle. To be clear, I should leave a small portion of the lamp unobstructed?
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
Koffee Kosmo
Top  #22 Print Post
Posted on 02/10/2023 7:27 PM
This is a photo of my TO diffuser plate mod

[img] i.postimg.cc/4mgXs8Vd/01-B31220-01-D5-4-D2-F-BD39-12841-C2-C5512.jpg[/img]
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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allenb
Top  #23 Print Post
Posted on 02/10/2023 7:47 PM
So all directly downward radiant energy is unimpeded so most IR is making it to the coffee ?
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
renatoa
Top  #24 Print Post
Posted on 02/11/2023 3:36 AM
Is a matter of how wide you cut the remaining ring.
Start with a first cut having the turbine diameter, and see how you like it.
When I did this first attempt I didn't noticed any change in roast progress, it was still majoritary convective, as with uncut screen, very little IR effect.
Could roast to the end without heat reduction before FC, but power level required was bigger, about 5-10% more power needed for same roasting time. The only gain was no chaff accumulating in the center of screen.
This could be of interest for your intended roast style, keeping power constant as much as possible.

Attached is a roast from that time, using the smallest cut screen, temperature is ET, not BT, and RoR the same.
Notice the constant power to the end, the lower red line.
renatoa attached the following image:
image_2023-02-11_114203840.png
Edited by renatoa on 02/11/2023 3:45 AM
 
Koffee Kosmo
Top  #25 Print Post
Posted on 02/11/2023 11:56 PM

Quote

allenb wrote:

So all directly downward radiant energy is unimpeded so most IR is making it to the coffee ?


I have found it to be the best option - based on trial and error
I started off with drilling holes with a hole saw and then progressively went all the way to what you see in the photo above

So just use that fold depression in the metal as a line guide and cut the centre away for best results


KK
Koffee Kosmo attached the following image:
a606b831-3177-44b1-a78b-9bcb48727ecc.jpeg
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.
 
Web
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