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 KKTO Roaster Wire Agitator Build
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| Koffee Kosmo |
Posted on 08/11/2013 6:02 PM
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 Administrator  Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
Having many emails over an extended time to design an easy DIY agitator to suit all variations of the KKTO roaster posed a few challenges 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 After some 20 or so designs 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 met and was actualy exceeded Below is a series of build photos and a diagram for all to follow easily The diagram shows how it is put together Photos build series are of parts required, and step by step build KK
Koffee Kosmo attached the following images:
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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| Koffee Kosmo |
Posted on 08/11/2013 6:10 PM
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Administrator Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
Also a safe fan guard mod for better heat distribution This mod is safe for all It allows the user to roast larger batches It helps the Turbo Oven to cycle better and quicker KK
Koffee Kosmo attached the following images:
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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| JackH |
Posted on 08/11/2013 6:28 PM
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 Administrator Posts: 1808 Location: Boston, Massachusetts Joined: May 10, 2011 |
Hi KK, These are mods I wish I had at the beginning. The agitator/motor shaft was a problem for me and I wound up cheating and getting one of your KKTO blades. I switched to the wires to test and it really does a great job. I am going to keep them. Are the "S" wire bends away from the direction of rotation like the blade agitator? Mine are straight and I will add some bends to try. My motor goes CCW in rotation. I heard about removing the fan guard completely to get some extra wattage out of the heater. I did this and have no problems. All the other safety devices are gone from my oven anyway. Nice mods and I hope this gets others into this type of roaster. Jack ---Jack
KKTO Roaster. |
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| Koffee Kosmo |
Posted on 08/11/2013 7:29 PM
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Administrator Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
The leading edge of the bends point to the direction of the rotation I have always used counter clockwise rotation So in the photos it reflects this The wire can also be left as loops as per the photo 3 Low speed motors will agitate fine with this design Bending the wire blades allows the user to tune to ones roaster and speed of rotation photo 2 I always fine tune a KKTO by testing the mixing / agitation with three red beans as a visual photo 1 Mixing the beans well by observing is key Mixing not pushing the beans will always produce better, more consistent and even roast results KK
Koffee Kosmo attached the following images:
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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| jkruer01 |
Posted on 01/07/2016 1:33 PM
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 Newbie  Posts: 35 Location: Joined: January 05, 2016 |
Where do you get a shaft to make something like this? |
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| Koffee Kosmo |
Posted on 01/07/2016 6:43 PM
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Administrator Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
Quote The shaft was specially fabricated for me from when I had kits available But that shaft was made specifically for the Arcosteel pot set and the matching base You can fabricate one to suit your build 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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| Tony_C |
Posted on 01/09/2016 1:52 PM
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 1/4 Pounder  Posts: 168 Location: Joined: September 24, 2015 |
I like the design of your agitator, and after staring at it long enough  I see that it is a very simple design, and it's given me some ideas for making mine. The whisk wire would definitively stir through the beans better, and would not just push them around. |
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| Koffee Kosmo |
Posted on 03/04/2017 7:18 PM
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Administrator Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
For anyone wanting to get the perfect Wire agitator shape This shape will also work for the solid blade but with a few bend tweaks Its my pleasure to upload this update for all to use Print this drawing and use it as a template Best way to use it is Print the shape and cut in a circle to suit your perforated insert Poke a hole in the center Place it over the shaft and let it sit on the bottom of the insert Bend your wire agitator to the shape When done Rip the paper away Easy KK
Koffee Kosmo attached the following image:
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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| renatoa |
Posted on 03/05/2017 12:42 AM
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Administrator Posts: 1849 Location: Europe Joined: September 30, 2016 |
I guess this shape orientation is valid for CW rotation, right ? A recommended blade count ? I have a 10 RPM motor atm, do you think is too slow ? Here is a video showing in action with 600 g of greens: https://www.youtu...OlE3pfpblA The big problem I encountered with this type of agitator is after drying phase, the beans are lighter and the whole mass start to rotate with the blades, instead being rock and rolled... so I am forced to shake the whole pot every minute, to to tear down the piles that builds between blades. DIY: TO based IR 750g
Moded commercial: Dieckmann RoestMeister, Nesco, popper(s). TC4ESP, MS6514, USB/Artisan/Apps, PID controllers Grinder: MBK Feldgrind, mod'ed Porlex to 47 conical burrs, vintage PeDe Dienes, Kinu M38 Gaggia Mini, Aeropress, drip |
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| Koffee Kosmo |
Posted on 03/05/2017 2:09 AM
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Administrator Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
Quote renatoa wrote: I guess this shape orientation is valid for CW rotation, right ? A recommended blade count ? I have a 10 RPM motor atm, do you think is too slow ? Here is a video showing in action with 600 g of greens: https://www.youtu...OlE3pfpblA The big problem I encountered with this type of agitator is after drying phase, the beans are lighter and the whole mass start to rotate with the blades, instead being rock and rolled... so I am forced to shake the whole pot every minute, to to tear down the piles that builds between blades. The optimum agitator speed is 65 to 70 rpm " for 2 blades " Using more blades will allow one to use a slower rpm motor Yes the blades are bent to suit an anti clockwise direction The bends in the blades is such, that they mix and direct the beans to the outside wall and back again to the centre, while causing a corkscrew motion at the same time The bent blades need a 10mm / 1/2" gap from the side wall Having straight blades will in affect push the bean mass in a large mass The bend blade pushes and allows an escape of massed beans at the outside wall 10prm is a tad to slow, I recommend that you find and fit a faster rpm motor 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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| renatoa |
Posted on 03/05/2017 4:00 AM
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Administrator Posts: 1849 Location: Europe Joined: September 30, 2016 |
May I have a video of such blade in action ? I can't visualize what could bring the beans back to the middle, and I thought I know a ton of physics... I know that 6x RPM optimal speed from the drum roasting theory, but the reasons are completely different than in the case of a flat surface agitation, as in a TO "pan" scenario. Maybe your pan bottom is not flat, but very mild funnel ? This could explain the force which could bring the beans back to the center... Don't let me wrong, I don't doubt your expertise, but I want to understand first, the believe part comes after, naturally ;) Still don't get notifications for any of your posts, in any thread ! I get a lot of notifications of other people replies, so the issue should be related to your account. Is there any "Ignore" button somewhere that I could push by mistake ? :) DIY: TO based IR 750g
Moded commercial: Dieckmann RoestMeister, Nesco, popper(s). TC4ESP, MS6514, USB/Artisan/Apps, PID controllers Grinder: MBK Feldgrind, mod'ed Porlex to 47 conical burrs, vintage PeDe Dienes, Kinu M38 Gaggia Mini, Aeropress, drip |
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| Koffee Kosmo |
Posted on 03/05/2017 4:40 AM
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Administrator Posts: 1572 Location: Brisbane Australia Joined: December 31, 2008 |
To get notifications you need to turn them on at the top of this thread (Track This Thread) or any thread you want to follow To see all my videos go to the Koffee Kosmo YouTube channel This video is of the solid twin blade agitator that the new wire version is modelled on https://youtu.be/... I have another wire agitator video of the first wire loop design prior to the bend 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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| JackH |
Posted on 03/05/2017 5:11 AM
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Administrator Posts: 1808 Location: Boston, Massachusetts Joined: May 10, 2011 |
Quote renatoa wrote: Still don't get notifications for any of your posts, in any thread ! I get a lot of notifications of other people replies, so the issue should be related to your account. Is there any "Ignore" button somewhere that I could push by mistake ? :) If you are looking in the Active Forums section under Navigation, then the most recent posts should appear. Any new posts you have not read should be highlighted in green. I can see KK's posts. You may want to try clearing your browser cache or cookies. ---Jack
KKTO Roaster. |
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