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JackH
OfflineAdmin
· 07/04/2020 10:27 AM
Happy 4th of July! jazzyhands

JackH
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· 06/24/2020 7:58 AM
@Mark McCornack, Please post your question in the forum.

Mark McCornack
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· 06/15/2020 9:28 PM
Hi! Looking for a legacy inlet temp sensor on 13 yr old Gene Cafe. It seems they've changed it and now you need new mother board and new sensor. Any ideas where I can find compatibile old one? Mark

Samaniego
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· 06/09/2020 6:39 PM
Wich thermometers Can i buy for my roasting machine compatible with usb or macbook?

JackH
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· 06/05/2020 5:38 PM
peveleth, It is better if you start a post in the forum with your question. These shouts go away in time.

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Stir Crazy Convection Oven Roaster (Suppentown)
nelsonba
In the process of building this. Is it necessary to modify the stirring arms of the stir crazy to get better agitation? Any best practices? Thanks!
 
Koffee Kosmo

Quote

nelsonba wrote:

In the process of building this. Is it necessary to modify the stirring arms of the stir crazy to get better agitation? Any best practices? Thanks!


From all reports the standard arms will fail at some point
So it's best to replace them with a material that is more robust

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
JackH
The original arms and motor on the stir crazy will work but you will be limited to small roasts (150-200g). The stock arm motor is weak and auto reverses under load. A plastic piece is used to secure the arms and it may melt or deform.

There are lost of mods here and on other sites to beef up the arms, or replace them. I started out with the same as you and went through changes that are documented here:

http://forum.homeroasters.org/forum/v...post_29048

Here is another site that got me started with the stir crazy turbo oven:
http://turbocrazy.atspace.com/index_f...roject.htm
Edited by JackH on 01/25/2014 8:02 PM
---Jack

KKTO Roaster.
 
nelsonba
Well. I ended up putting some copper tubing on the arms in a couple places. Roasted my first batch tonight. 10 oz. [img][/img]First crack at about 9 min. 2nd around 12:30 and it was -8!. Here are the results. How'd I do? It was a blend, so I'm not sure it's the best candidate to see how even the roast is.
nelsonba attached the following image:
photo_4_1.jpg
 
JackH
The roasting time seems about right. It looks good. The blend will appear uneven. Give it a few days rest and try it out.

Did you modify the turbo oven and bypass the thermostat?

Jack
---Jack

KKTO Roaster.
 
nelsonba
No. I didn't do anything to the turbo oven. I ran it at about 400 the entire time. I'm not sure it ever stopped heating, probably due to the cold weather. I assume the heat light would go off?

I did disconnect the heater in the Stir Crazy though.

How long do you typically let the beans rest before using?
 
Koffee Kosmo
Degas and rest time depends on the origin of the beans
But as a general rule of thumb - 5 to 10 days

KK
Edited by Koffee Kosmo on 01/30/2014 12:01 AM
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
nelsonba
I couldn't wait. Had some this morning. So only about 36 hours or so. Interesting. Grainy maybe? And not the body I was expecting. It was the Moka Kadir Blend from Sweet Maria's. Just looked up their full review. Looks like they recommended at least 48 hours but said maybe even 3+. Guess I'll try to lay off for a while longer.
 
Koffee Kosmo
Degas time also changes based on the roast level
Lighter roasts need longer
Darker roasts can be brewed sooner

A tell tail sign of not enough rest/degas is when doing espresso the coffee stream will bubble due to air pockets

And we all try to have a sneak taste ( for experimental reasons of course ) Grin

KK
I home roast and I like it
Blog - http://koffeekosmo.blogspot.com/
Bezzera Strega: Mazzer Robur Grinder: 5 Box hand grinders: Pullman Tamper Convex: (KKTO) Turbo Oven Home Roaster: CONA Glass Rod Syphon: Pyrex Brewer:
 
http://koffeekosmo.com.au
mtbizzle

Quote

JackH wrote:
There are lost of mods here and on other sites to beef up the arms, or replace them.


I've seen many of these arm mods around, adding metal to the arms or replacing the arms. E.g. yours where you crimped the copper, Jack. Don't think I can crimp metal like that, no vise here. Don't know what I can add to the arms without a vise to pinch the metal, so am looking at replacing the arms.

I have seen someone replace the arms with 3/32" stainless steel rod. https://davidmpeters.files.wordpress....g_1155.jpg My question is, do you just try to bend that around the drive shaft - is that enough to ensure that it turns with the shaft?

I'm thinking I can get a scto with a flavorwave AX-797DH TO I found very cheaply running sooner, for less $$, than the flour sifter roaster I've been chipping away at, so I'm hoping to finalize the plans here. Going to try this shaft replacement. http://biobug.org/coffee/turbo-crazy/...zy/sc-mod/
Roast: Nostalgia popper
Grind: Comandante c40, Encore
Brew: v60, flair espresso, moka pot, french press, cezve w/ 'Scott Rao' water
Ask me about Tea!
 
JackH
I used copper pipe that was very thin walled. It was easy to crush it down on the main arm to make larger paddles. I also used stainless steel welding rod. I forget how I attached the wire.
I used a 3/8" extension socket which fit the motor shaft.

I never really got the performance I wanted so I finally bought a KKTO agitator/motor shaft from KK. That worked the best. Not sure if he still has them.
---Jack

KKTO Roaster.
 
Mbb
You will want more motor. Speed and torque. Imo.
I had a older stir crazy..black...metal panel on bottom, bigger than smaller red plastic ones.

I riveted a 14W 30 rpm motor to that metal bottom .
Grind sides of motor shaft flat so it fits 1/4 " deep socket. Socket just sticks up into hole in SC. Use bolt for agitator that drops into socket. I drilled bolt for wire, and brazed brass wire to flat washer for agitator arms.....i perfer the drilled bolt.

Then a heavy copper 2" tubing cap $12 from plumbing store dropped over wires....kept agitator weighted down...kept beans away from center where they can be stagnant going in small circle.

2 sets agitator arms one pushed out to side, next swept it back to center. One raked higher up wall to keep beans moving there too.
Edited by Mbb on 05/27/2020 8:35 PM
 
renatoa
60 rpm is even better.

If having tools and skills, you can file/mill the motor shaft as a hexagon, to fit the standard screwdriver power tool bits.
I built my agitator on such bit, using SS from tea sugar pliers.
The bit is snap on magnetic, so I can easily remove the agitator, for the cooling phase.
Better see it in action: https://www.youtube.com/watch?v=6acgv...acgv5eyX0o
 
mtbizzle
Thanks for the great replies everyone.

agitator arms

Quote

I used copper pipe that was very thin walled.

Hmm OK, maybe I'll try that then. Seems very straightforward if they will stay in place. Will just have to determine size to prevent scraping the floor of the SC I suppose and maybe pinch it with pliers.

I've found a good looking SS rod at Grainger, for less than $2, but the ones that are appropriate diameter are only 1ft, which is right about the diameter of the stir crazy, so not enough for bending the arms. Unless I somehow buy 2, and find a way to secure both rods to the drive shaft well.

I certainly wonder too if KK has those! I've seen his agitator before and it seems solid.

MBB, do you by chance have a pic of your agitator arms?

Renatoa, your agitator seems to work wonderfully. tea sugar pliers, lol. Unfortunately I don't really have the tools & skills Grin

motor

Quote

Mbb wrote:

You will want more motor. Speed and torque...I riveted a 14W 30 rpm motor to that metal bottom.


If I get a motor, can it be wired up to the electronics already in the stir crazy? Or would it need a power supply?
I'm guessing the motor would have to protrude out the bottom of the SC... did you guys just cut a hole in a table so it could drop through or something?


drive shaft

Quote

Use bolt for agitator that drops into socket. I drilled bolt for wire, and brazed brass wire to flat washer for agitator arms.....i perfer the drilled bolt.


I am doing a drive shaft replacement... stir crazy motor -> socket -> SS hex bolt -> nuts/washers -> arms -> copper cap.

I'm not following what you're saying in the "I drilled bolt for wire.... I prefer the drilled bolt" part.


Quote

Then a heavy copper 2" tubing cap


Think I got the same, have a copper cap to place over the top of the drive shaft. Not sure if that is what you were using it for.
Edited by mtbizzle on 05/29/2020 1:14 AM
Roast: Nostalgia popper
Grind: Comandante c40, Encore
Brew: v60, flair espresso, moka pot, french press, cezve w/ 'Scott Rao' water
Ask me about Tea!
 
renatoa
The 14W motor mentioned above, if it is a 60KTYZ, then it is for direct connection to A/C mains. Beware to get the right voltage Grin
 
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