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KKTO Build
Kinder
Would like some advice. I currently roast with two different set ups. First one being a baby GF with heat gun. I can roast up to around 20 Oz. Second one is a Turbo Crazy, it is the second gen so it is smaller in size which means I can only roast around 12 Oz max. I feel that the SCTO is easier clean up and easier to roast with given I don't have to mess with a hot drum (burnt myself multiple times).

So I have decided since I already have 1350 Watt Turbo Oven I would give the KKTO a shot. I do have the mechanical/electric skills needed so building is not a problem. Mainly looking for some advice on parts. Any help would be appreciated.

What motor is best for this project?
What type of shaft?
Chaff ejection - should I go with a larger pot to create gap between outside pot and roasting chamber, or cut slits in roasting chamber and use similar size pot?
 
renatoa
The KKTO looks seducing, but my experience with various agitators was deceiving.
Gave up with the horizontal pan style beans agitation and now I have my best results ever with 5-600 grams in a 14Dx23L drum, placed in a 12l 32cm dia pot, and powered with a 1400W TO.
I have a Baby GF on the way, and will try the same drum in this oven, then decide which solution to keep.
Drum manipulation is easier than a turning upside down a whole TO pan/pot, to eject the beans, imo.
Good luck with whatever you decide.
DIY: TurboOven, Popcorn
Moded commercial: Dieckmann RoestMeister, Nesco
PID/ramp/soak controllers
 
Kinder
Renato, I believe we have exchanged ideas previously on the Baby GF. I think I just enjoy building things so I figured I would give it a go. Originally I built the SCTO for a back up roaster but have grown to like it for its easy set up and functionality.
I will still use my drum roaster though.
 
renatoa
Yes, I read about Baby GF from your thread, thank you !
DIY: TurboOven, Popcorn
Moded commercial: Dieckmann RoestMeister, Nesco
PID/ramp/soak controllers
 
Koffee Kosmo
For a KKTO you need a motor speed of between 50 and 70 rpm
This speed is best for the larger roasts it can handle from 700 to 1000 grams

I have motors specially made for me on a small batch run @ 70rpm
As to the agitator the shape and bend that I have posted about coincides with the speed of the motor and work in unison

The chaff separates from the beans and settles on the bottom of the outer chamber and the chaff is disposed of at the end of the roast when it's cool

Note
I have posted 2 KKTO designs V1 & V2
Both work in the same way but different pots are used

http://forum.home...ad_id=1142

KK
My web site > koffeekosmo.com.au I home roast and I like it :P
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: BNZ MD74 Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
koffeekosmo.com.au
Kinder
Thank you for the info, I look forward to another roaster build.
 
Koffee Kosmo
More KKTO build thread reading, from JackH
http://forum.home...ad_id=2842

All the information and then some has been written and posted since the design was made available in 2008

I am always here along with other owner builders to help in any way
Member Galumay runs his KKTO roaster that I built for him for 8 hours straight

KK
My web site > koffeekosmo.com.au I home roast and I like it :P
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: BNZ MD74 Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
koffeekosmo.com.au
galumay
...and i push 1200g batches through it all day!
Izzo Pompeii l HG- One l Caravel l KKTO
 
JackH
Kinder wrote:

What motor is best for this project?
What type of shaft?



Heat from the agitator shaft can be transfered to the motor shaft so I used a surplus DC gearmotor (continuous duty). Others have also used automotive windshield wiper motors and window motors. Many have plastic shafts so watch out.

I used a 3/8 socket to allen to couple the motor to the agitator shaft. (I forget the exact size but you will have to research for your motor)


Make sure the allen part of the socket is removable and the allen is the size that matches your motor shaft:
JackH attached the following image:
capture_49.jpg

---Jack

KKTO Roaster.
 
Koffee Kosmo
This is what I use, the shaft connects direct to the motor

And the wire agitator

KK
Koffee Kosmo attached the following image:
image_53.jpeg

My web site > koffeekosmo.com.au I home roast and I like it :P
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: BNZ MD74 Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
koffeekosmo.com.au
Kinder
Thanks again, really appreciate all of the help. Looks like you (KK) sell kits for the KKTO, if so what is the price and whats included?
 
Koffee Kosmo
Kinder wrote:

Thanks again, really appreciate all of the help. Looks like you (KK) sell kits for the KKTO, if so what is the price and whats included?



I dont sell kits anymore
However I can help with the drive section components, that is motor, shaft, wire agitator and the bend template

I have motors that are specially made for me to handle the weight,speed and the heat
These motors are made on a limited run

Best to PM me if interested

KK
My web site > koffeekosmo.com.au I home roast and I like it :P
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: BNZ MD74 Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
koffeekosmo.com.au
Kinder
Ok, just thought I would check to maybe speed up the process. No worries I will more than likely have questions regarding the shaft and agitator. I will probable just purchase a motor on amazon. I will keep you posted, thanks again!!!
 
allenb
I will probable just purchase a motor on amazon


Kk, are there any particular threads one should take a look at to see particulars on picking the best motor in regards to shaft size/length, rpm, torque etc.?

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
Koffee Kosmo
allenb wrote:

I will probable just purchase a motor on amazon


Kk, are there any particular threads one should take a look at to see particulars on picking the best motor in regards to shaft size/length, rpm, torque etc.?

Allen


Most of the information is here - http://forum.home...ad_id=1142

And here - http://forum.home...ad_id=3445

If you need any other info that is not covered, then I will do my best to answer

KK
My web site > koffeekosmo.com.au I home roast and I like it :P
Blog - http://koffeekosm...gspot.com/
Bezzera Strega: BNZ MD74 Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
koffeekosmo.com.au
bobbooks
See www.bobbooks.net for a link on eBay for a high torque 120VAC motor used in a SC/TO roaster.
 
renatoa
Using same motor, but 10RPM, for a drum-in-a- pot TO based roaster.

Also, the diode mod is gold, using for years since popcorn, where the diode usage can led to incredible accurate profiles, but a lot of switching :)

For TO I am using the diode alone for drying phase, and also for development, full power with thermostat for ramp phase.
So very few switches, and the profile is made by natural curve of machine.
The main difference is how I connect the diode, parallel on thermostat ;)
DIY: TurboOven, Popcorn
Moded commercial: Dieckmann RoestMeister, Nesco
PID/ramp/soak controllers
 
JackH
bobbooks wrote:

See www.bobbooks.net for a link on eBay for a high torque 120VAC motor used in a SC/TO roaster.


Very nice write up on the turbo roaster! Wish I had seen it back in 2011 when I was playing with different motors. Thanks for posting.
---Jack

KKTO Roaster.
 
bobbooks
Diode across the thermostat is simply brilliant! Perfect results in ramp control for sure.
 
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