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Author Topic: KKTO Wire Agitator as Alternative  (Read 3804 times)

Koffee Kosmo

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KKTO Wire Agitator as Alternative
« on: 12/08/2013, 02:31 PM »
I have been asked by email many times to design an easy DIY agitator to suit all variations of the KKTO roaster
It posed a few challenges but I was up to the task

After some 20 or so designs trialed and tested I found the best performing design was archived by using the wire strands from a whisk, directly coupled onto the shaft

The design brief was set to myself to be -
1) Economical easy to obtain parts / items
2) Home handyman can make it
3) Work equally well as the solid blade
4) Adjustable to suit any KKTO variant roaster
5) Adjustable at time of build to any width of roast chamber

The design brief was actualy exceeded
Below is a series of build photos and a diagram for all to follow easily

Parts required to do the job - shaft, wire, securing plate,

[attach=1]  [attach=2]


After a measure of the wire length feed the strands through the two drilled holes

[attach=3]

The tails can be cut off or secured with a spring - one longer wire piece is bent over and it's secured for life

 [attach=4]

The diagram shows how it is put together

[attach=5]

KK

Continued next post


Bezzera Strega Lever: Robur & BNZ MD74 conical grinder
Pullman Barista Tamper Convex:  Designer of the KKTO Home Roaster: 4 Hand grinders:
Web site - www.koffeekosmo.com
Blog - http://koffeekosmo.blogspot.com

Koffee Kosmo

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KKTO Wire Agitator as Alternative
« Reply #1 on: 12/08/2013, 02:42 PM »
Once that is done its time to shape

The wire can be left as loop shapes and is best for low speed motors and will agitate fine with this design

[attach=1]

Bending the wire blades allows the user to tune to ones roaster and speed of rotation
The leading edge of the bends point to the direction of the rotation
I have always used counter clockwise rotation in my design

[attach=2]  [attach=3]

I always fine tune a KKTO by testing the mixing / agitation action with three red beans as a visual

[attach=4]

Mixing or agitating the coffee beans well is key - it's best that they are constantly turning or spinning with a little intermittent rest time
Aim for the bean mass to be pushed outwards and gradually back to the centre and back out again in a repeat cycle

Mixing not pushing the beans will always produce better, more consistent and even roast results

KK
Bezzera Strega Lever: Robur & BNZ MD74 conical grinder
Pullman Barista Tamper Convex:  Designer of the KKTO Home Roaster: 4 Hand grinders:
Web site - www.koffeekosmo.com
Blog - http://koffeekosmo.blogspot.com

Kelsey

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KKTO Wire Agitator as Alternative
« Reply #2 on: 12/08/2013, 03:17 PM »
What's with the spring?
LONDINIUM I, Compak E10.

Full disclosure: I have commercial arrangements with Bezzera (AU) and Londinium Espresso. I am not required to market them on this forum & any opinions expressed are my own.

Koffee Kosmo

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KKTO Wire Agitator as Alternative
« Reply #3 on: 12/08/2013, 04:11 PM »
What's with the spring?

It's been used as a rudder and a stirring arm when the beans expand over the spring as they roast 
In my post I noted that the wires can be cut and the spring if used just holds the wires neatly together

KK
Bezzera Strega Lever: Robur & BNZ MD74 conical grinder
Pullman Barista Tamper Convex:  Designer of the KKTO Home Roaster: 4 Hand grinders:
Web site - www.koffeekosmo.com
Blog - http://koffeekosmo.blogspot.com

CoffeeParts

 

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