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 Turbo Crazy build and first roast
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| JackH |
Posted on 07/13/2011 6:33 PM
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 Administrator  Posts: 1809 Joined: May 10, 2011 |
A view with the case top removed. The new motor is about 18 RPM with plenty of power.
JackH attached the following image:
---Jack
KKTO Roaster. |
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| JackH |
Posted on 07/13/2011 6:36 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
The stir crazy base sits on top of the motor case and has 4 screws that go into holes I drilled in the SC base. This acts as a guide and keeps things stable.
JackH attached the following image:
---Jack
KKTO Roaster. |
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| JackH |
Posted on 07/13/2011 6:43 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
I also added insulation to the SC base and the plate between the heating element and the wiring at the top of the turbo oven. The SC base still gets hot, but a lot cooler than it was. I also added a TC4/arduino/LCDAPTER to monitor temperatures and log roasts. I built the case by hand and added some cherry side panels.
JackH attached the following image:
---Jack
KKTO Roaster. |
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| JackH |
Posted on 07/13/2011 6:45 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
A rear view of the case. I am not too happy with the panel mount K connectors, they are too loose. You can see the arduino usb and power connectors peeking out.
JackH attached the following image:
---Jack
KKTO Roaster. |
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| JackH |
Posted on 07/13/2011 6:58 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
This was a interesting project. I put a lot of thought and effort into it and it was worth it. I learned a lot. So far it does a nice job roasting, we will see.. I do plan on building a different roaster sometime but this one will do for now.... Thanks to all who helped me with this! --Jack ---Jack
KKTO Roaster. |
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| randytsuch |
Posted on 07/13/2011 7:32 PM
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 1/2 Pounder  Posts: 395 Joined: June 20, 2009 |
Wow, that's a nice looking TC4/Arduino setup you built, I'm impressed with your workmanship. It puts my roaster setup to shame :( Randy |
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| Koffee Kosmo |
Posted on 07/13/2011 7:54 PM
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 Administrator Posts: 1621 Joined: December 31, 2008 |
Jack Nice work on a proven system & I also like the TC4/Arduino setup How did you connect the Variac I have been wanting to add one for a while now Drawings would be good (you have my email) 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 07/13/2011 8:41 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
Randy, thanks for the complements. I am an old prototype builder, mostly electronic musical instruments... It looks good but we'll see how well it performs. I am really liking the TC4 and watching the temps and RoR. I think it will help me time the roast better. KK, thanks for the help with this. Great suggestion about using springs. Variac control and bypassing the thermostat and other stuff can be dangerous. I pretty much gutted the Turbo Oven's wiring and created a suicide machine with no safety switches or thermostat. Needs to be constantly monitored. ---Jack
KKTO Roaster. |
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| JackH |
Posted on 11/19/2011 6:16 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
I went through another design update: A faster motor (Wiper motor running at low speed of 35 rpm) and a different stirring arm design inspired by BenGeldreich's nice new roaster. I am also using a new Bean temp K thermocouple from Omega which is proving to be excellent and fast. The video is rough and I hope it shows up here. It looks kind of surreal to me. Trying a direct link: http://s273.photo...oaster.mp4 Edited by JackH on 11/21/2011 6:38 AM ---Jack
KKTO Roaster. |
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| Koffee Kosmo |
Posted on 11/22/2011 5:19 AM
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Administrator Posts: 1621 Joined: December 31, 2008 |
Try the coloured bean test for viewing good mixing agitation Adjust or revise as necessary The video looks good 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 11/22/2011 5:43 AM
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Administrator Posts: 1809 Joined: May 10, 2011 |
Thanks Paul! I will give that a try. One thing I notice with twice the agitation is that my roast profiles are off. I am baking and it seems I need to shorten the time. Does this make sense? Another thing is that it is fall here and the ambient temperature is much lower. I am in my garage (unheated). --Jack ---Jack
KKTO Roaster. |
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| Koffee Kosmo |
Posted on 11/22/2011 6:30 AM
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Administrator Posts: 1621 Joined: December 31, 2008 |
If you are getting first crack in the 9 to 13 minute mark (depending on the bean origin) Then you are roasting in the zone 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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| BenGeldreich |
Posted on 11/24/2011 12:38 PM
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 1/4 Pounder  Posts: 76 Joined: January 20, 2011 |
Jack, I have to second KK's approach on adding a few coloured beans. Record each different combo of speed and or arm placement. with the coloured beans that way you can determine which one is best. I think I even did a test with peaberry just to see if it changed at all. You can check out most of my test videos on youtube. I'll point you to the video of the combination I decided to use. http://www.youtub...RxVyzel93c Ben Edited by BenGeldreich on 11/24/2011 12:39 PM --------
Ben Turbo Oven Roaster w/ Variac, TC4Cw/ Bourbon | Bezzera Strega | Baratza Vario Grinder | Yama 5 Cup Syphon | Aeropress |
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| JackH |
Posted on 11/24/2011 3:07 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
Ben & Paul, I will try that with the colored beans. I think the "S" shape blades running counter-clockwise seem to work best. Since my roasting pot is shallow I have to keep the speed down. 35 rpm seems to be the max for this set up. My goal is to eventually go full KKTO. Just need to find the right size outer pot. This SC/TO works well and I have plenty of time to look. Jack Edited by JackH on 11/24/2011 3:07 PM ---Jack
KKTO Roaster. |
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| BenGeldreich |
Posted on 11/24/2011 6:11 PM
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1/4 Pounder Posts: 76 Joined: January 20, 2011 |
Quote JHan816 wrote: Ben & Paul, I will try that with the colored beans. I think the "S" shape blades running counter-clockwise seem to work best. Since my roasting pot is shallow I have to keep the speed down. 35 rpm seems to be the max for this set up. My goal is to eventually go full KKTO. Just need to find the right size outer pot. This SC/TO works well and I have plenty of time to look. Jack Jack, I was in your boat ... until I came across the right pot. ;) Nice thing about using a wiper motor is that one can configure it to run at 4 different speeds. So no need to change motor when and if you find that pot!!! Ben --------
Ben Turbo Oven Roaster w/ Variac, TC4Cw/ Bourbon | Bezzera Strega | Baratza Vario Grinder | Yama 5 Cup Syphon | Aeropress |
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| Koffee Kosmo |
Posted on 11/25/2011 4:31 PM
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Administrator Posts: 1621 Joined: December 31, 2008 |
Pots can be purchased here - http://www.cookin..._7_5L.html The very same ones we use 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 11/29/2011 8:21 AM
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Administrator Posts: 1809 Joined: May 10, 2011 |
I think I finally found out how to embed the video. Hate to duplicate the video, but I can't edit my previous post. [video]http://www.youtube.com/watch?v=vi0lmOxUzZk[/video] Edited by JackH on 11/29/2011 8:22 AM ---Jack
KKTO Roaster. |
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| JackH |
Posted on 05/01/2012 2:09 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
Update: the Wiper motor did not last. After 20 or so roasts, it started making bad bearing noises and slowing down. Too bad, it was running well. Upon opening the wiper motor gearbox I find plastic gears! I think it was a GM wiper motor. There was an AC motor that Lylabrown mentioned in another thread that I just ordered. This one is 50 RPM and looks stronger and better made. Hopefully no plastic parts there... http://www.surplu...e=electric Really enjoying this roaster and started using the RoastLogger software which looks like a winner. http://forum.home...ad_id=2564 |
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| miamichillin99 |
Posted on 06/13/2012 5:11 PM
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 Newbie  Posts: 21 Joined: May 10, 2012 |
Quote Burner0000 wrote: Quote bvwelch wrote: Quote JHan816 wrote: I need to add something to keep the turbo oven from shifting around on the ring. Some folks make a homemade gasket for this, using high-temp RTV which is supposedly food-safe after curing (be careful to read the fine print on the tube you purchase to be sure): http://forum.home...ead_id=363 EMI Supply sells high temp 600'F Food grade RTV. :P http://www.emisup...cription=1 I bought mine from U.S. plastic for $11 shipped. See my other post in this forum for the link. it's good up to 500 and food grade. It was recommended from others at CG. |
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| JackH |
Posted on 06/14/2012 3:49 AM
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Administrator Posts: 1809 Joined: May 10, 2011 |
I did use the US plastics seal for the top of the ring and it works very well. The EMI tube RTV is also useful for adding a bead to the bottom of the spacer ring once it is in place. |
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| pnguser123 |
Posted on 06/15/2012 7:19 PM
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 Newbie Posts: 3 Joined: June 14, 2012 |
Jack, I also roast with a Stir Crazy and Turbo Oven. I replaced the center shaft with a pen making bearing. It has a 1/4 hole in the center and I pressed it into a hole that I had drilled in the bottom plate of the Stir Crazy. This keeps the shaft from wearing out. I also added a gap in the aluminum ring that is recommended as a spacer between the Stir Crazy and the Turbo Oven. This allows the air flow to push the chaff out of the roaster and not burn. I pretty much run the roaster at full temperature for the entire roast. It take about 12 minutes from start to finish. I have used one of my roasters for 6 years and roasted hundreds of 3/4 pound roasts. I just built another one so I could rotate roasts and not spend so much time roasting. See my site at http://philsroast...tures.html Lived in Papua New Guinea, Been roasting for 8 years, I use twin Crazy Stir/Turbo Oven roasters. Now live in Sanford Florida.
Phil |
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| JackH |
Posted on 06/16/2012 6:14 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
Quote pnguser123 wrote: Jack, I also roast with a Stir Crazy and Turbo Oven. I replaced the center shaft with a pen making bearing. It has a 1/4 hole in the center and I pressed it into a hole that I had drilled in the bottom plate of the Stir Crazy. This keeps the shaft from wearing out. I also added a gap in the aluminum ring that is recommended as a spacer between the Stir Crazy and the Turbo Oven. This allows the air flow to push the chaff out of the roaster and not burn. I pretty much run the roaster at full temperature for the entire roast. It take about 12 minutes from start to finish. I have used one of my roasters for 6 years and roasted hundreds of 3/4 pound roasts. I just built another one so I could rotate roasts and not spend so much time roasting. See my site at http://philsroast...tures.html Welcome to Homeroasters Phil! Nice setup with the two roasters. I would like to see that shaft mod you did. Do you use the original stir crazy arms or something different? I did a lot of tweaking of the arms and motor shaft. ended up using Stainless steel welding rod with stainless steel springs over them. Nice to see another turbo roaster! --Jack |
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| JackH |
Posted on 06/16/2012 6:22 PM
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Administrator Posts: 1809 Joined: May 10, 2011 |
Quote Burner0000 wrote: Nice site and roaster Kosmo! The more I read about infrared roasters you guys are building the more I wanna try one myself. Possibly replace my current stovetop roasting. :p Whats the max batch size you guys have roasted? Anything close to 2.2lb? Hi Burner0..., The standard TurboCrazy roaster can do about 300-400g with some modification of the arms. Paul "Koffee Kosmo's" KKTO roaster uses the same turbo oven but a much larger roast chamber, stronger motor and better agitator. I am not sure the maximum capacity but I am sure it may be close to 2 pounds. --Jack |
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| Koffee Kosmo |
Posted on 06/20/2012 6:01 AM
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Administrator Posts: 1621 Joined: December 31, 2008 |
Quote Burner0000 wrote: Nice site and roaster Kosmo! The more I read about infrared roasters you guys are building the more I wanna try one myself. Possibly replace my current stovetop roasting. :p Whats the max batch size you guys have roasted? Anything close to 2.2lb? I help people build roasters with whatever they have on hand But the concept is the same The roaster batch size is governed by 2 things Overall roast chamber volume to the available heat generated by the standard Turbo Oven without any modifications One can roast up to 1kg however the roaster is optimized to roast 700/800 grams with a little practice If one was to tinker with lower roast chamber volumes and stop the Turbo Oven from its on/off cycle one can roast over 1kg Having said that I recently helped a follow enthusiast to build a dual heat KKTO It utilities a round electric skillet Some parts from the KKTO shop e.g. - Shaft, Adapter ring  Some parts from the Turbo Oven And build a base with timber See photos Regards KK
Koffee Kosmo attached the following images:
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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