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allenb
OfflineAdmin
· 04/02/2020 4:50 AM
Morning Ed, I haven't done any green coffee hoarding yet but am hoping the supplies don't end up like the toilet paper isles!

snwcmpr
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· 03/31/2020 2:53 PM
Hey Ed. Thanks. roar

homeroaster
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· 03/31/2020 11:21 AM
Hey quarantined home roasters! I hope you have great coffee! If they have a run on coffee, I hope you're set with your great home roast! Find me on Facebook! Ed Needham

snwcmpr
Offline
· 03/25/2020 11:49 AM
New Rochelle in the news. I think of you every time I hear it. ... Please stay safe.

allenb
OfflineAdmin
· 03/21/2020 7:36 AM
Good morning homeroasters morning Everyone is hopefully staying healthy through this. Hang in there and stay safe!

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KKTO Build
mkane
By reconnecting the thermostat ( which is already done) and using a TC. Heck I can't even control the roast on my 1lb. drum roaster.
Always learning
 
renatoa
TC ?
TC4 board ?
ThermoCouple, to measure temperature ?
 
mkane
TC to measure temp using a simple Fluke meter. Don't know if it will be BT or ET.
Always learning
 
renatoa
Gooood...
So no electronics/computer, nothing bad about this, I was there and not disappointed, the results are same class as an Artisan roast.
What would be my steps in this scenario:
- adjust thermostat shifting the temperature scale, to be able to cycle at 250C, if not already there...
- mount the diode that ensure the continuous smooth temperature increase without huge swing due to on-off switching,
or...
- mount a $12 power variator, for perfect profiling experience without compromise.
www.ebay.com/itm/4000W-AC-220V-SCR-Vo...2569538620
 
mkane
What type of diode? 1/2 w. 1 w 5 w? I have plenty on hand. I'll look at the variator. Pairing the TO with Artisan is a possibly. We now use Artisan with a drum roaster.
Edited by mkane on 03/13/2020 9:43 AM
Always learning
 
mkane
Took a look. I have a SUT I can use with this. Might be an inexpensive experiment.
Edited by mkane on 03/13/2020 4:49 PM
Always learning
 
renatoa

Quote

mkane wrote:

What type of diode? 1/2 w. 1 w 5 w? I have plenty on hand. I'll look at the variator. Pairing the TO with Artisan is a possibly. We now use Artisan with a drum roaster.


Double current than your heater, and 1.4x the voltage of the mains.
For an 1300W 230V lid, which means 6 Amps current draw, I would go with a minimum of 12 amps 400V diode, but for 5 cents more I am more safe with 16 Amps 600V

The diode and SCR solutions are exclusive, you should decide which of them.
Edited by renatoa on 03/14/2020 1:54 AM
 
mkane
Think I'll go with the SCR
Always learning
 
mkane
Double Boiler arrived today. I drilled the 4 mm holes in the inner pot, got the bearings installed, cut a false floor using the lid and mounted that also. Tomorrow I'll tinker with the agitator.
mkane attached the following image:
dsc_0300_1.jpg

Always learning
 
mkane
.....
mkane attached the following image:
dsc_0297_1.jpg

Always learning
 
Koffee Kosmo
Does the insert have any holes ?

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
mkane
It does. I drilled them myself. If it needs more, I'll drill em'. 4 mm
mkane attached the following image:
dsc_0302.jpg

Edited by mkane on 03/19/2020 10:40 AM
Always learning
 
Koffee Kosmo
You can put thin slits on the sides if it’s easier

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
mkane
I've got holes in the sides also. There spaced out more that on the bottom. Are these hole just for chaff removal?

I also got the agitator working. Not sure if it's the best but I suppose a roast will tell the whole store. Seems to work best with 350 grams of beans. I'm going to work on another agitator like the fancy unit you designed while holed up here at home. The first agitator doesn't get down low enough with 200 grams of beans. With 350 is looks like it mixes well.
Edited by mkane on 03/19/2020 7:58 PM
Always learning
 
Koffee Kosmo

Quote

mkane wrote:

I've got holes in the sides also. There spaced out more that on the bottom. Are these hole just for chaff removal?

I also got the agitator working. Not sure if it's the best but i suppose a roast will tell the whole store. Seems to work best with 350 grams of beans


The holes have dual purpose
Heat circulation and chaff removal
You will see the chaff spinning above the the agitating beans and you can judge where the holes should go from observing

Agitation is important
It must mix the beans like rolling stones- constantly on the move, not just a mass of beans pushed around and around to achieve a great roast

Have a look at some of my videos with the red bean test and copy the results with your setup

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
mkane
for some reason my pics won't load
Always learning
 
JackH

Quote

mkane wrote:

for some reason my pics won't load


Keep your file name simple, no special characters of spaces. Don't use preview post or reply, for some reason it disables the attached photo.

Keep your image file small. I use resize in MS paint and scale down to 800X600 or so. No need to have 4000X3800 for web viewing.

Loading images to test:
JackH attached the following images:
all_parts.jpg all_top_components.jpg

---Jack

KKTO Roaster.
 
renatoa
The chaff is not exhausted from the roasting insert by the bottom holes, conversely, the air is sucked by the turbine in a vertical column, from the bottom.
The bottom holes are required mainly to ensure a good airflow in the beans bed.

Having a different approach than original KK design, by using a wider and lower insert, that allows using the whole glass area of the lid, I can observe better how is the chaff flow in such oven.
After absorbed and ejected radially by the lid turbine, the chaff path is a descending spiral along the walls to the bottom of the pot.
 
mkane
.............
mkane attached the following images:
dsc_0302_1.jpg dsc_0303.jpg

Always learning
 
Koffee Kosmo
I will give you the physical engineering explanation behind the chaff removal in a KKTO design
Please note that appropriately 90% of chaff is removed to the lower chamber

Chaff spins along the side wall of the perforated pot and above the agitating beans during the early part of the roast

Some smaller chaff exits via the holes on the sides via fan forces
Note - Beans roasting expand in volume size x 3 fold or more

While the bean volume increases the chaff is folded into the agitating bean mass and ground down into smaller pieces
The chaff now smaller works itself to the lower area and exit via the lower sides and bottom of the perforated insert

Note - Slits with a raised gill ( like shark gills ) on the side wall will catch and remove a good percentage of the early circulating chaff
But that is an design idea for a fully manufactured roaster

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
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