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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Turbo Oven Roasters

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KKTO build questions*FOR SALE*
renatoa	#61 Posted on 02/25/2020 8:58 AM
Administrator Posts: 3104 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.


Koffee Kosmo	#62 Posted on 02/25/2020 9:35 AM
Administrator Posts: 1621 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	#63 Posted on 02/25/2020 11:38 AM
Administrator Posts: 3104 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.


mkane	#64 Posted on 02/25/2020 11:51 AM
1/4 Pounder Posts: 151 Joined: October 23, 2017	Does the false floor need standoff's to keep it perfectly level? Always learning


Alaroast	#65 Posted on 02/25/2020 1:51 PM
Newbie Posts: 43 Joined: February 04, 2020	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	#66 Posted on 02/25/2020 3:47 PM
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


Koffee Kosmo	#67 Posted on 02/25/2020 4:28 PM
Administrator Posts: 1621 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	#68 Posted on 02/25/2020 4:38 PM
Administrator Posts: 1621 Joined: December 31, 2008	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 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	#69 Posted on 02/26/2020 7:17 AM
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


Alaroast	#70 Posted on 02/26/2020 7:29 AM
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


mkane	#71 Posted on 02/26/2020 8:31 AM
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


mkane	#72 Posted on 02/26/2020 8:36 AM
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


JackH	#73 Posted on 02/26/2020 3:45 PM
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.


Koffee Kosmo	#74 Posted on 02/26/2020 3:46 PM
Administrator Posts: 1621 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	#75 Posted on 02/26/2020 3:50 PM
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.


mkane	#76 Posted on 02/26/2020 7:53 PM
1/4 Pounder Posts: 151 Joined: October 23, 2017	Quote JackH wrote: 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? 1/2" When I gather all my parts I'll start a build thread. Edited by mkane on 02/26/2020 8:14 PM Always learning


mkane	#77 Posted on 02/26/2020 8:16 PM
1/4 Pounder Posts: 151 Joined: October 23, 2017	Quote Koffee Kosmo wrote: 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 perforated plate - so I would put one there as well KK Always learning


Alaroast	#78 Posted on 02/27/2020 8:59 AM
Newbie Posts: 43 Joined: February 04, 2020	Installed false bottom with about 1.5" thickness of the ceramic insulation. I decided against using the full 2" thickness since this stuff is pretty dense and would have taken a lot of compression and pressure while sealant was curing. I used the copper silicone stuff since it had a little higher heat rating than the red. I found an old aluminum cake plate at the thrift store for $2 which was easy to cut to size with a jigsaw and file for the false bottom. I filed down edges to allow for about .040" clearance around all sides after cutting with saw. After setting bottom in place with sealant, I smoothed out the fillet with my finger and then placed a 1"2 roll of tape on bottom, inserted the inner pot and place a gallon jug of water in there to provide weight while curing. Make sure all holes through false bottom and pots are properly aligned before sealant starts to set up. Should be good to go in 24 hours where I'll do a lengthy heat burn in. Don't want silicone fumes in my coffee Thanks KK for the pictures of how you went about this; it helped out a lot as I did mine. Alaroast attached the following images: Edited by Alaroast on 02/27/2020 9:06 AM Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster


Koffee Kosmo	#79 Posted on 03/03/2020 7:12 PM
Administrator Posts: 1621 Joined: December 31, 2008	Well done Alaroast For ease of use and easy electrical connection to the drive motor it?s best to fit a female connector plug for the wall wart 12V power supply Something like this 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	#80 Posted on 03/04/2020 7:47 AM
Newbie Posts: 43 Joined: February 04, 2020	Thanks! About the drive motor connection; I'm using a 120V motor so I just have it wired in directly to a standard 2 prong plug for house power. I am still trying to figure out roast times and temps though. On my old SC/TO roaster, the roasting chamber space was much smaller and so heat was easier to manage and usually roasts were completed in 12-15 minutes to beginning of 2C. I'm finding that I need to preheat the KKTO at least 10 minutes until I get it up to about 480F. Once I drop in beans, it takes a while to recover in temperature and my last roast took nearly 25 minutes. I think with added insulation and correct preheat times, I'll be able to get that time down to about 15 minutes. My last roast was also 800 grams so I may need to back off to about 650 grams. Fiorenzato Bricoletta Espresso Machine, Obel EB Grinder, USRC 3kg roaster


renatoa	#81 Posted on 03/04/2020 8:29 AM
Administrator Posts: 3104 Joined: September 30, 2016	If possible, try to measure the real power of the bulb heater. There is a big spread in the supply sources the chinese are using to build these lids. Was surprised one day to have a lid that requires 80% level to bring 250 grams into FC in 10 minutes, while my regular workhorse needs only 64% for same task. Measured, and the new lid was been found having 900W !!!


Koffee Kosmo	#82 Posted on 03/04/2020 5:10 PM
Administrator Posts: 1621 Joined: December 31, 2008	Quote Alaroast wrote: Thanks! About the drive motor connection; I'm using a 120V motor so I just have it wired in directly to a standard 2 prong plug for house power. I am still trying to figure out roast times and temps though. On my old SC/TO roaster, the roasting chamber space was much smaller and so heat was easier to manage and usually roasts were completed in 12-15 minutes to beginning of 2C. I'm finding that I need to preheat the KKTO at least 10 minutes until I get it up to about 480F. Once I drop in beans, it takes a while to recover in temperature and my last roast took nearly 25 minutes. I think with added insulation and correct preheat times, I'll be able to get that time down to about 15 minutes. My last roast was also 800 grams so I may need to back off to about 650 grams. I use this method for blended beans to equalise the moisture content but will also work on any single origin Run the beans normally on the lowest temp setting for up to 10 minutes Then ramp up the heat to full and start time on the roast proper for the duration of the roast The sweet spot for the roaster is 600gr to 750gr But as ones roasting experience develops after several hundred roasts - and with some modifications to the TO like deflector mod and thermostat you can roast up to 1 kg The ideal TO is one that operates at 1400W as that is matched to the roaster volume If the TO is lower wattage then the volume needs to be reduced lower to compensate So take baby steps and learn the capabilities of the design Don?t follow any other roaster profile - make up your own to your personal taste in coffee I personally prefer the older roast methods to bring out the full flavour of coffee So experiment with roast times to FC and SC ( no right or wrong here ) and choose the ones that your tastebuds love 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	#83 Posted on 03/04/2020 6:36 PM
1/4 Pounder Posts: 151 Joined: October 23, 2017	Does someone know what steps need to be taken to bypass the Supentown's thermostat. Is it a simple resistor change or is it more complicated? Always learning


renatoa	#84 Posted on 03/05/2020 1:43 AM
Administrator Posts: 3104 Joined: September 30, 2016	Check back in the thread, first page, the repair video link in post #5. When the guy detach the plate with bulb from the glass lid, you see the thermostat hanging in two wires. Unplug thermostat from those sockets and use the terminals to connect the SSR. Or short them if you want to connect SSR in other location. Tip: before going further with electronic control, you could try the diode trick, is much simpler and effective, but sure, not allowing Artisan connection and profiling.


Koffee Kosmo	#85 Posted on 03/05/2020 6:24 AM
Administrator Posts: 1621 Joined: December 31, 2008	Quote mkane wrote: Does someone know what steps need to be taken to bypass the Supentown's thermostat. Is it a simple resistor change or is it more complicated? Try this thread and see post 47 https://forum.hom...owstart=40 KK Edited by JackH on 03/05/2020 4:35 PM 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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