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 KKTO build questions***FOR SALE***
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| mkane |
Posted on 02/23/2020 3:30 PM
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 1/4 Pounder  Posts: 151 Joined: October 23, 2017 |
I have some leftover rockwool I used for bass traps I'll try.
Always learning
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| Koffee Kosmo |
Posted on 02/23/2020 4:11 PM
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 Administrator  Posts: 1627 Joined: December 31, 2008 |
Quote mkane wrote: A picture tells a thousand words. Will any type of insulation work as long as it's flameproof? I'm going to attempt to duplicate that shaft for the agitator. Thanks I personally use high temp insulation Material used in kilns However any insulation material that has a heat rating over the maximum heat output of the TO is acceptable KK 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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| mkane |
Posted on 02/23/2020 6:23 PM
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1/4 Pounder Posts: 151 Joined: October 23, 2017 |
There's no agitator pic's in this thread.
Always learning
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| Koffee Kosmo |
Posted on 02/23/2020 7:02 PM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote Plenty of photos on the main thread as it?s a step by step build Go to my Koffee Kosmo YouTube Chanel for videos But since you asked, here are a few different options that I have approved Please note - this bend orientation is for anti clockwise operation     Sorry about the wire in the photo but this is a side view  KK 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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| Alaroast |
Posted on 02/24/2020 7:48 PM
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 Newbie  Posts: 43 Joined: February 04, 2020 |
I've got my false bottom cut and drilled and now waiting on the kaowool insulation to get here in a few days. It's a ceramic fiber blanket good to 2300?F. KK, in your pictures, you are using Loctite red silicone sealant. I plan on using a similar red or copper high temp silicone but was wondering about offgassing when it heats up. I'm sure this has been discussed somewhere but wondered if it has to be food safe.
Edited by Alaroast on 02/24/2020 7:53 PM Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster
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| Koffee Kosmo |
Posted on 02/24/2020 10:26 PM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote Alaroast wrote: I've got my false bottom cut and drilled and now waiting on the kaowool insulation to get here in a few days. It's a ceramic fiber blanket good to 2300?F. KK, in your pictures, you are using Loctite red silicone sealant. I plan on using a similar red or copper high temp silicone but was wondering about offgassing when it heats up. I'm sure this has been discussed somewhere but wondered if it has to be food safe. Any heat rated sealant that can be used with auto exhaust gas sensors is OK - but just to be certain do all your testing with heat to burn off any lingering gasses KK 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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| renatoa |
Posted on 02/25/2020 2:29 AM
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 Administrator Posts: 3301 Joined: September 30, 2016 |
You can use simple wool, it is rated at 5-600C, and far more safe to release fibers (and breathe them...) in the atmosphere, than mineral fibers. |
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| Koffee Kosmo |
Posted on 02/25/2020 6:05 AM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote renatoa wrote: You can use simple wool, it is rated at 5-600C, and far more safe to release fibers (and breathe them...) in the atmosphere, than mineral fibers. But the insulation is sandwiched in between sheet metal So it?s safe KK 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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| renatoa |
Posted on 02/25/2020 7:19 AM
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Administrator Posts: 3301 Joined: September 30, 2016 |
Not so familiar with KKTO build details, where is the insulation, on the bottom only ? I don't see any space for insulation on the lateral walls... Is the agitator shaft hole so well sealed ? |
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| Koffee Kosmo |
Posted on 02/25/2020 8:31 AM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote renatoa wrote: Not so familiar with KKTO build details, where is the insulation, on the bottom only ? I don't see any space for insulation on the lateral walls... Is the agitator shaft hole so well sealed ? The design was first announced in 2008 It?s best that you read the thread [url] https://forum.homeroasters.org/forum/viewthread.php?thread_id=1142&rowstart=0[/url] KK 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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| renatoa |
Posted on 02/25/2020 8:58 AM
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Administrator Posts: 3301 Joined: September 30, 2016 |
Yep, a quick scan of the first three pages returns insulation related to false bottom only. Please check PM about the notice I sent you. |
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| Koffee Kosmo |
Posted on 02/25/2020 9:35 AM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote renatoa wrote: Yep, a quick scan of the first three pages returns insulation related to false bottom only. Please check PM about the notice I sent you. There are 9 pages Version one and Version 2 roasters I have already answered the question that the insulation is sandwiched between sheet metal - and it?s totally safe. And no insulation fibres get into into the roasting beans as no insulation material is exposed Please understand that I am a mechanical engineer and have factored in just about every variable KK 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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| renatoa |
Posted on 02/25/2020 11:38 AM
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Administrator Posts: 3301 Joined: September 30, 2016 |
Sure, me too engineer, of another technical discipline, so my way was toward a different approach, only the lid is common. I don't contest something, just try to understand, because I don't see any place for insulation in the lateral walls. |
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| mkane |
Posted on 02/25/2020 11:51 AM
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1/4 Pounder Posts: 151 Joined: October 23, 2017 |
Does the false floor need standoff's to keep it perfectly level?
Always learning
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| Alaroast |
Posted on 02/25/2020 1:51 PM
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Newbie Posts: 43 Joined: February 04, 2020 |
Quote I'm not speaking from experience because I'm still building mine, but...I was not planning on using anything like standoffs but was going to use the thickness of the insulation to give me the desired height of false floor from pot bottom. I will need to compress the insulation slightly (approx. .5") to give me the needed gap between false floor and bottom of the perforated inner pot. As KK posted several days ago in his pictures, he used a level to ensure false bottom was level while silicone is curing. Also, I did purchase the pasta pot with riveted handles rather than welded handles because that is what I could find reasonably priced. The protruding rivets on the inside of the pot did not create a problem getting false floor in place. I just tipped the floor into place under the rivets and all is well. Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster
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| mkane |
Posted on 02/25/2020 3:47 PM
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1/4 Pounder Posts: 151 Joined: October 23, 2017 |
I suppose i could use a piece of wood the correct thickness, whatever it may be, between the perforated pot and the false floor to keep it in place while silicone set's up.
Always learning
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| Koffee Kosmo |
Posted on 02/25/2020 4:28 PM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote renatoa wrote: Sure, me too engineer, of another technical discipline, so my way was toward a different approach, only the lid is common. I don't contest something, just try to understand, because I don't see any place for insulation in the lateral walls. Re lateral walls In the manufactured kit version, the false floor was a whole inset that had an air gap similar to double glazing on the lateral wall However I have recommended that some external insulation be used Something like a towel or wool blanket loosely wrapped ( and in my opinion is all that?s needed ) See drawing below of the kit version as an explanation (Note - Kit no longer available)  Some builders have used insulation ribbon externally as in the photos below   KK 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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| Koffee Kosmo |
Posted on 02/25/2020 4:38 PM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote The insulation material is soft so just press to get the correct level even if you need to add some weights and the silicone will hold it in place once it?s dried The reason the false floor needs to be level is so the shaft does not rub and grind also not to add drag on the drive motor Always make sure that all mechanical connections are either level or dead centre for smooth operation I have mentioned on the main thread about self centre tabs for this important reason Self centre tabs  Pots in place  KK 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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| Alaroast |
Posted on 02/26/2020 7:17 AM
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Newbie Posts: 43 Joined: February 04, 2020 |
Quote mkane wrote: I suppose i could use a piece of wood the correct thickness, whatever it may be, between the perforated pot and the false floor to keep it in place while silicone set's up. That is exactly what I had in mind but was going to use a roll of 1/2" tape since that is what I had. Anything that will establish the 1/2" gap. Are you in the process of building now? Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster
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| Alaroast |
Posted on 02/26/2020 7:29 AM
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Newbie Posts: 43 Joined: February 04, 2020 |
Quote The reason the false floor needs to be level is so the shaft does not rub and grind also not to add drag on the drive motor Always make sure that all mechanical connections are either level or dead centre for smooth operation I have mentioned on the main thread about self centre tabs for this important reason KK That's a good point and the reason I went a bit oversized on my through holes in the pot and false floor. My initial try was to keep everything nice and tight with close tolerances but experienced a problem with my agitator shaft on the first roast. My shaft extension has 2 set screws that I partly tighten down but still allow the extension to be removed from the motor shaft. I should have put some threadlocker on them to keep them in place but didn't. Halfway through my initial roast, one of those set screws backed out seizing against the hole in bottom of pot.  I almost lost this roast but salvaged it. Even with the several minute delay in the middle of roast cycle, It still turned out acceptably; drank some this morning.
Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster
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| mkane |
Posted on 02/26/2020 8:31 AM
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1/4 Pounder Posts: 151 Joined: October 23, 2017 |
Quote Alaroast wrote: Quote mkane wrote: I suppose i could use a piece of wood the correct thickness, whatever it may be, between the perforated pot and the false floor to keep it in place while silicone set's up. That is exactly what I had in mind but was going to use a roll of 1/2" tape since that is what I had. Anything that will establish the 1/2" gap. Are you in the process of building now? Still collecting parts. I have the TO, motors on the way, pots are at the post office. I'm going to have an agitator shaft machined when specs are determined. Haven't decided is it's going to be on wheels or not. I have a few thermocouples and will run this through Artisan. Always learning
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| mkane |
Posted on 02/26/2020 8:36 AM
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1/4 Pounder Posts: 151 Joined: October 23, 2017 |
I pondering over the idea of some kind of bearing for the shaft https://www.mcmas...-bearings/ to pass through on the outer pot. Thoughts? Edited by JackH on 02/26/2020 3:45 PM Always learning
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| JackH |
Posted on 02/26/2020 3:45 PM
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 Administrator Posts: 1809 Joined: May 10, 2011 |
Quote mkane wrote: I pondering over the idea of some kind of bearing for the shaft https://www.mcmas...-bearings/ to pass through on the outer pot. Thoughts? Those look good. I wish I did that for mine. What shaft diameter are you going with? ---Jack
KKTO Roaster. |
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| Koffee Kosmo |
Posted on 02/26/2020 3:46 PM
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Administrator Posts: 1627 Joined: December 31, 2008 |
Quote mkane wrote: I pondering over the idea of some kind of bearing for the shaft https://www.mcmas...-bearings/ to pass through on the outer pot. Thoughts? Those look good. I wish I did that for mine. What shaft diameter are you going with? Yes that will work fine The most crucial area is the false floor plate - so I would put one there as well KK 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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| JackH |
Posted on 02/26/2020 3:50 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
Mkane, I would suggest you start a build post so we can follow your progress. I think we are straying from Alaroast's build thread.
---Jack
KKTO Roaster. |
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