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JackH
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· 02/11/2020 1:10 PM
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· 02/11/2020 9:35 AM
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· 02/10/2020 10:25 AM
CoffeeRoastersClub
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· 02/06/2020 7:24 AM
Searched but no can find, but does anyone on here use the roasters made by CRC (Coffee Roasters Club) in Connecticut?

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· 02/05/2020 2:50 PM
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KKTO build questions
mkane
following your thread, hoping to build one soon, very soon.
Always learning
 
JackH
@Alaroast If you look through the Turbo roaster build posts here, you will see what works and what does not.

I went through the same process 10 years ago starting with the Stir Crazy and ending up with a KKTO style roaster. Tried many motors including windshield wiper. One of the issues for me in addition to speed was heat transfer from the agitator shaft to the motor. I wound up using a surplus continuous duty gear motor. This has worked for hundreds of roasts.

With the perforated inner pot of the KKTO design, most of the chaff falls through the inner pot holes to the bottom, away from contact with the beans.
---Jack

KKTO Roaster.
 
Alaroast
Jack, thanks for the feedback and info. Yes the KKTO design seems to be a well thought out design and has not undergone much change over the years with many happy users that needed more capacity than the SC/TO roasters. That's what brought me to this site. I have toyed around with either modifying by current SCTO roaster with a better motor which is still an option or ditching the SC base and going with the whole KKTO design which I'd probably be much happier with in the long run. I'm still unsettled though on the motor. I thought I read where a 60 RPM motor was preferred but some have used 30 RPM's or less. Some have used 12V DC while others have used AC.

Thoughts on this motor?


https://www.ebay.com/itm/Synchronous-...2813390381
Edited by JackH on 02/10/2020 11:50 AM
Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
JackH
It looks good if 60RPM works for your setup. Worth a try.
Mine was a surplus motor made by Oriental, 110V running about 40RPM which worked for me. Probably too much motor for the use but it was cheap.
JackH attached the following image:
capture_24.png

---Jack

KKTO Roaster.
 
renatoa

Quote

Alaroast wrote:

Thoughts on this motor?



Is a KTYZ as those I recommended in the post #10.
Used many in various builds for three years, no failure so far.
 
Gullygossner

Quote

renatoa wrote:

Quote

Alaroast wrote:

Thoughts on this motor?



Is a KTYZ as those I recommended in the post #10.
Used many in various builds for three years, no failure so far.


I second the KTYZ motor. I’m using one on my kkto setup. I’ve only got 7-8 roasts under my belt on this setup but I was pleased with the mounting options, easy wiring, availability and price.
 
Koffee Kosmo
The main thing with agitation speed and agitator design is more about the mixing of the beans
Depending on the torque on the motor this is what happens mechanically
1) When beans are green the motor speed drops from its stated speed due to the weight
2) Then gradually speeds up to full speed at about the 3/4 point of the roast

Be aware that it’s most I repeat “most “ important that the beans are mixed completely while agitating ( you don’t want the agitator to be pushing a mass of beans in circles )

So the design of the agitator is just as important

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
Alaroast
I've found what I believe is a good deal on a heavy duty pot and bought it. Now on to the motor. What is the consensus for motor RPM if I use the wire wisk design? I'm aiming for 60 RPM but will 50 RPM be enough?
I'm leaning towards the synchronous KTYZ gear motor, 110 VAC.
Alaroast attached the following images:
pot_1.jpg pot2.jpg

Edited by Alaroast on 02/11/2020 8:26 PM
Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
renatoa

Quote

Koffee Kosmo wrote:

“TIP” When looking at pots sets it’s best to use pot sets with welded handles

KK


These are not welded... but wondering why this reason... Grin
 
Koffee Kosmo

Quote

renatoa wrote:

Quote

Koffee Kosmo wrote:

“TIP” When looking at pots sets it’s best to use pot sets with welded handles

KK


These are not welded... but wondering why this reason... Grin


It’s easier to slide in the false floor
The rivets make it harder but not impossible

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
Alaroast

Quote

Koffee Kosmo wrote:

Quote

renatoa wrote:

Quote

Koffee Kosmo wrote:

“TIP” When looking at pots sets it’s best to use pot sets with welded handles

KK


These are not welded... but wondering why this reason... Grin




It’s easier to slide in the false floor
The rivets make it harder but not impossible

KK

I was wondering why it was suggested to use pots with welded handles and figured it had something to do with clearance; I'll work around that issue. I chose this pot because of the thicker walls and it seemed like it would help with heat retention once heated up. I was looking at the cheap stainless pasta pots in the $30 range but decided against them because of poor construction and wanted to keep cost down. I picked this one up used for $30 shipped so not a bad price.
Now back to the motor RPM question. Is 50 RPM enough or should I go with 60 RPM?
Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
Koffee Kosmo
Go 60 RPM is my advice
Or 70 RPM if available

Also be aware that the volume of the total roast chamber should be no more than 9 lt and no lower than 7 lt

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
Alaroast

Quote

Koffee Kosmo wrote:

Go 60 RPM is my advice
Or 70 RPM if available

Also be aware that the volume of the total roast chamber should be no more than 9 lt and no lower than 7 lt

KK

It looks like 60-70 RPM's is the sweet spot recommended for KKTO's but I am having difficulty currently finding any 60KTYZ motors in that range in the US. I have found 50 or 80 RPM motors on the Bay. Would 80 be too fast?

I did find a Hurst 3204-024 60 RPM geared motor reasonably priced but still have to wire in a capacitor.
Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
renatoa
eBay US probably not, but China yes, 72 RPM for 110V 60 Hz
 
Alaroast
I received the pot in post 28 above today and encountered a slight problem. The handles for the inner pot come in contact with the turbo oven. Don't really want to get any sort of spacer ring so probably off with the handles. Other than that, a really nice heavy pot that should work well.
Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
Koffee Kosmo

Quote

Alaroast wrote:

I received the pot in post 28 above today and encountered a slight problem. The handles for the inner pot come in contact with the turbo oven. Don't really want to get any sort of spacer ring so probably off with the handles. Other than that, a really nice heavy pot that should work well.


Place each handle in turn into a bench vice and bend the handle
Or a similar method

It’s steel it will bend to your will

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
Alaroast

Quote

Koffee Kosmo wrote:

Quote

Alaroast wrote:

I received the pot in post 28 above today and encountered a slight problem. The handles for the inner pot come in contact with the turbo oven. Don't really want to get any sort of spacer ring so probably off with the handles. Other than that, a really nice heavy pot that should work well.


Place each handle in turn into a bench vice and bend the handle
Or a similar method

It’s steel it will bend to your will

KK


Great minds think alike, that's exactly what I just did after realizing how hard those rivets are. Bent them just enough for clearance taking into account thickness of silicone tubing seal that will be installed on rim. Motor should arrive tomorrow so should be drilling pots once I come up with final design of shaft extension. Exciting stuff coming together. Great design KK!
Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
Alaroast
Attached is a picture of the motor I ended up purchasing. It is a Hurst 3204-024 and turns at 60 RPM. I mounted it through the top of my roasting station with shaft coming through a .5" hole drilled through the surface. The motor is secured to the bottom side of the work surface. I repurposed a drill bit extension (6" long) that accepted the .25" motor shaft with set screws. I drilled 2 small holes through the upper end of the extension for the whisk wires. The whisk wires were looking promising but only gave me an agitator with "blades" 180 degrees apart which didn't seem to be enough for the 60 RPM's. I looked around my shop and remembered I have a spool of 1/8" SS wire so I refashioned some nice wire blades that look like they will be perfect (pictures coming). What I like about this motor is that if it binds up, it will auto reverse just like the stir crazy. Of course it bound up a few times while forming and checking the fit of the agitator blades until I got the right fit. Right now I'm waiting on high heat silicone tubing and the right size motor capacitor to get here before I try a roast. I also need to figure out the false bottom thing.
I did dump in about 700 gm of greens and turned on the motor. I threw a few roasted beans in with the mix to check the agitation level. Looks promising.
Alaroast attached the following image:
motor_6.jpg

Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
Alaroast
Another question comes to mind as I am finalizing the build of my roaster. I've read through most of the threads multiple times and am still wondering about the false bottom placement. There has been mention of total roast chamber volume not exceeding a certain size. Would it be safe to say that if I am using a pasta pot setup, then I would simply place the false bottom as close to the bottom of the suspended insert as possible? I haven't measured anything yet but thinking there is only about 1" or 25 mm between bottom of pot and bottom of insert so is a false bottom even needed when using a pasta pot setup?
Meanwhile, below are pictures of agitator and bean cooler. It's a 5 gallon bucket with lid recessed into top of roasting station. I cut a hole in lid for colander insert. I have another lid with suction hose used for pulling roasted beans from roaster. Under the tabletop, I have a 2" hole drilled into the side of bucket where the shop vac hose goes. I then place the second lid on top of first lid and turn on the vac which easily sucks down the lids and 1" hose sucks beans into cooling chamber.
Alaroast attached the following images:
cooler1_5.jpg agitator_3.jpg

Edited by Alaroast on 02/21/2020 7:14 AM
Fiorenzato Bricoletta Espresso Machine, KitchenAid Proline Espresso Machine, Obel EB Grinder, SC/TO roaster for now
 
renatoa
If not high temp silicone, that tube will melt sucking hot beans.
 
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