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renatoa
03/29/2024 1:55 AM
Soubriquet and kaicee18, welcome to forum

renatoa
03/25/2024 12:38 PM
coffee drink, Ramper?

allenb
03/24/2024 12:10 PM
Siam3D Welcome

renatoa
03/23/2024 3:02 PM
welcome cup, andrewg

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03/21/2024 5:10 PM
TRH629 Welcome

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KKTO build questions***FOR SALE***
mkane
I have some leftover rockwool I used for bass traps I'll try.
Always learning
 
Koffee Kosmo

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.
 
mkane
There's no agitator pic's in this thread.
Always learning
 
Koffee Kosmo

Quote

mkane wrote:

There's no agitator pic's in this thread.


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

i.postimg.cc/cvXj0jHP/257-B22-D0-25-DC-48-A7-B12-B-BA513-ACEB934.jpg

i.postimg.cc/PLJ7x4vJ/298-C1357-BAD3-4241-B850-AD0-CA834-FF1-F.jpg

i.postimg.cc/34DbjxBH/964300-D5-38-A1-42-E5-B54-E-45-D70-AC3920-D.jpg

i.postimg.cc/3yqcDv2B/FE3-CD92-D-D844-4-BDB-A499-926-AA37-F152-B.jpg

Sorry about the wire in the photo but this is a side view

i.postimg.cc/SYhVW7RW/F52-ADAAE-CDC3-4400-95-DE-7-AF7244451-D3.jpg





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.
 
Alaroast
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
 
Koffee Kosmo

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.
 
renatoa
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.
 
Koffee Kosmo

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.
 
renatoa
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 ?
 
Koffee Kosmo

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.
 
renatoa
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.
 
Koffee Kosmo

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.
 
renatoa
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.
 
mkane
Does the false floor need standoff's to keep it perfectly level?
Always learning
 
Alaroast

Quote

mkane wrote:

Does the false floor need standoff's to keep it perfectly level?

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
 
mkane
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
 
Koffee Kosmo

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)

i.postimg.cc/zHyZRVSr/38-CB03-B2-DF4-D-4-BFA-8-DEE-920264-B986-DD.jpg


Some builders have used insulation ribbon externally as in the photos below

i.postimg.cc/hfY1Kh5B/791-EF4-C5-5-B48-487-C-8765-B59-AB7-E19-D16.jpg

i.postimg.cc/rdXGt3TZ/592-E1-E56-514-B-45-AD-9-EC9-3-B610-E8-E6-E23.jpg



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.
 
Koffee Kosmo

Quote

mkane wrote:

Does the false floor need standoff's to keep it perfectly level?


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

i.postimg.cc/7JDSQ2h3/09038244-78-D8-40-A4-A02-C-9-A45-A962666-F.jpg

Pots in place

i.postimg.cc/DJ1qggvf/95-E8-B99-F-F5-BE-4245-ACB2-5-D6-CA01-D712-B.jpg




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.
 
Alaroast

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
 
Alaroast

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. ShockI 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
 
mkane

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
 
mkane
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
 
JackH

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.
 
Koffee Kosmo

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.
 
JackH
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. coffee drink
---Jack

KKTO Roaster.
 
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