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Turbo Crazy build and first roast
JackH
Top  #51 Print Post
Posted on 06/14/2011 5:10 PM
I added mine where the original thermostat was in the SC. Used JB Weld to hold it in place. Seems to be holding very well.
JackH attached the following image:
thermal_probe.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #52 Print Post
Posted on 06/14/2011 5:12 PM
A view inside the SC base. You can see the 6-32 screw with a nut installed and the probe wire going in. I used the metal that held the original thermostat as a strain relief with a bit of high temp silicon.
JackH attached the following image:
thermo_probe_inner.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #53 Print Post
Posted on 06/14/2011 5:13 PM
I just let the thermocouple cable exit out the existing slot in the SC bottom.
JackH attached the following image:
probe_exit.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #54 Print Post
Posted on 06/14/2011 5:15 PM
I do get beans getting caught between the bead tip and the stirring arm once in a while. I am thinking of moving the thermocouple to a new location at the side of the pan, out of reach of the stirring arm. Going through the side wall horizontally.
JackH attached the following image:
new_location.jpg
Edited by JackH on 06/14/2011 5:17 PM
---Jack

KKTO Roaster.
 
JackH
Top  #55 Print Post
Posted on 06/14/2011 5:27 PM
I am almost done adding a much stronger motor to the SC. The current motor seems to be good for 300 - 350g of beans before it bogs down too much. This motor should handle more. I would like to be able to go to 1 to 1 1/2 pounds for my needs. It does mean adding a base to house the motor so it is not the portable unit it once was. Also looking at adding small paddles to the stirrer.

I will post more when it is done.

--Jack
---Jack

KKTO Roaster.
 
Koffee Kosmo
Top  #56 Print Post
Posted on 06/14/2011 6:24 PM
Keep up the good work
I went through the same processes as you in my minds eye and came up with the present KKTO design

Try my solution for the agitator jambing
Use a spring over the wire

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.
 
Web
JackH
Top  #57 Print Post
Posted on 06/14/2011 7:49 PM

Quote

Koffee Kosmo wrote:

Try my solution for the agitator jambing
Use a spring over the wire

KK


KK,your current stirrer design? That looks like a great idea! Now I will be looking for springs at the hardware store.
---Jack

KKTO Roaster.
 
JackH
Top  #58 Print Post
Posted on 07/13/2011 6:08 PM
Update...I have been working on the turbo roaster. First is the new setup with a wooden motor base housing a stronger motor connected to the original stir crazy base. Maybe I went too far with this....
JackH attached the following image:
setup_2.jpg
Edited by JackH on 07/13/2011 6:12 PM
---Jack

KKTO Roaster.
 
JackH
Top  #59 Print Post
Posted on 07/13/2011 6:31 PM
I came up with this design based on KK's agitator plus a few of my ideas for the stiring arms. It uses stainless steel welding rod with SS springs attached to a 3/8' to 1/4" socket. I also used 4 copper wire connectors to hold the wires and attach them together.

I find that they are adjustable and swing up and down to allow the arms to tilt. If I keep the leading arm flush and the one behind it up a bit, it creates a tilt which seems to help with the stiring.

I tried other designs but they seemed to move the whole 1 pound as a mass. This seems to stir it and I see the beans shuffle better.
JackH attached the following image:
stiring_paddles2.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #60 Print Post
Posted on 07/13/2011 6:32 PM
The motor shaft is a 3/8" socket extension which goes down to the motor case.
JackH attached the following image:
motor_shaft.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #61 Print Post
Posted on 07/13/2011 6:33 PM
A view with the case top removed. The new motor is about 18 RPM with plenty of power.
JackH attached the following image:
motor_interior.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #62 Print Post
Posted on 07/13/2011 6:36 PM
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:
motor_box_top.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #63 Print Post
Posted on 07/13/2011 6:43 PM
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:
tc4_arduino.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #64 Print Post
Posted on 07/13/2011 6:45 PM
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:
tc4_arduino_rear.jpg
---Jack

KKTO Roaster.
 
JackH
Top  #65 Print Post
Posted on 07/13/2011 6:58 PM
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.
 
randytsuch
Top  #66 Print Post
Posted on 07/13/2011 7:32 PM
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
 
Koffee Kosmo
Top  #67 Print Post
Posted on 07/13/2011 7:54 PM
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.
 
Web
JackH
Top  #68 Print Post
Posted on 07/13/2011 8:41 PM
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.
 
JackH
Top  #69 Print Post
Posted on 11/19/2011 6:16 PM
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.
 
Koffee Kosmo
Top  #70 Print Post
Posted on 11/22/2011 5:19 AM
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.
 
Web
JackH
Top  #71 Print Post
Posted on 11/22/2011 5:43 AM
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.
 
Koffee Kosmo
Top  #72 Print Post
Posted on 11/22/2011 6:30 AM
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.
 
Web
BenGeldreich
Top  #73 Print Post
Posted on 11/24/2011 12:38 PM
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
 
Web
JackH
Top  #74 Print Post
Posted on 11/24/2011 3:07 PM
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.
 
BenGeldreich
Top  #75 Print Post
Posted on 11/24/2011 6:11 PM

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
 
Web
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